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Opal

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Big Photo

Queensland, Australia
© Antonio Borrelli




Formula:
SiO
 
2
· nH
 
2
O
Colour:Colorless, white, ...Hardness:5½ - 6½
Name:The origin of the name is uncertain. It may be from the Sanskrit "upala", meaning "stone" or "precious stone" or from opalus, the ancient Latin name for the gem (Pliny the elder, 75-79). Pliny may have also referred to the gem as paederos, but modern commentary by Kostov (2008) question if that name was actually applied to the opal of modern sense.


Although it is still (2007) regarded as a valid mineral species for historical reasons, Opal is not a true mineral in the accepted sense of the word as it is either composed of Cristobalite and/or Tridymite or composed of amorphous silica.

Opal is classified into four types:

Opal-CT Cristobalite-Tridymite
Opal-C Cristobalite
Opal-AG Amorphous -Gel (closely packed amorphous silica spheres form a diffraction grating to create Precious Opal).
Opal-AN Amorphous-Network (Hyalite)

Transitions between opal-AG, opal-CT and opal-C are common.


Visit gemdat.org for gemological information about Opal. Currently in public beta-test.

Classification of Opal

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/D.01-80
Nickel-Strunz 10th (pending) edition ID:4.DA.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
A : With small cations: Silica family
Dana 8th edition ID:75.2.1.1

75 : TECTOSILICATES Si Tetrahedral Frameworks
2 : Si Tetrahedral Frameworks - SiO2 with H2O and organics
Hey's CIM Ref.:7.8.8

7 : Oxides and Hydroxides
8 : Oxides of Si
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Occurrences of Opal

Geological Setting:Altering volcanic tuffs, basalts. Silicous deep-water marine sediments. Opal-C, opal-CT and opal-AG formation is restricted to low pressure and low temperature environments.

Physical Properties of Opal

Lustre:Vitreous, Waxy, Greasy, Dull
Diaphaneity (Transparency):Transparent, Opaque
Colour:Colorless, white, yellow, red, orange, green, brown, black, blue
Streak:White
Hardness (Mohs):5½ - 6½
Tenacity:Brittle
Cleavage:None Observed
Fracture:Irregular/Uneven, Splintery, Conchoidal
Density (measured):1.9 - 2.3 g/cm3

Chemical Properties of Opal

Formula:
SiO
 
2
· nH
 
2
O
Simplified for copy/paste:SiO2·nH2O
Essential elements:H, O, Si
All elements listed in formula:H, O, Si

Relationship of Opal to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.DA.05Quartz
SiO
 
2
4.DA.10Tridymite
SiO
 
2
4.DA.15Cristobalite
SiO
 
2
4.DA.20Mogánite
SiO
 
2
4.DA.25Melanophlogite
46SiO
 
2
· 6(N
 
2
,CO
 
2
) · 2(CH
 
4
,N
 
2
)
4.DA.30Lechatelierite
SiO
 
2
4.DA.35Coesite
SiO
 
2
4.DA.40Stishovite
SiO
 
2
4.DA.45Keatite
SiO
 
2
4.DA.50Seifertite
SiO
 
2
Related Minerals - Hey's Index Grouping:

- +
7.8.1Quartz
SiO
 
2
7.8.2Coesite
SiO
 
2
7.8.3Tridymite
SiO
 
2
7.8.4Stishovite
SiO
 
2
7.8.5Cristobalite
SiO
 
2
7.8.6Lechatelierite
SiO
 
2
7.8.7Silhydrite
3SiO
 
2
· H
 
2
O
7.8.9Mogánite
SiO
 
2

Other Names for Opal

Synonyms:
Gel-CristobaliteGel-pristobaliteHalf-OpalHemiopalIndivisible Quartz
IridotLechosopalLechososNesliteNevada Opal
PaederosPotchRumaniteSemiopalVidrite
Virgin Valley OpalWhite Cliffs Opal
Other Languages:
Arabic:العقيق
Basque:Opalo
Bosnian (Latin Script):Opal
Bulgarian:Опал
Czech:Opál
Dutch:Opaal
Esperanto:Opalo
Estonian:Opaal
Finnish:Opaali
French:Opale
Galician:Ópalo
German:Opal
Livit
Ljardit
Neslit
Rumanit
Vidrit
Hebrew:אופאל
אופל
Hungarian:Opál
Italian:Opale
Japanese:オパール
Latin:Opalus
Achates unguium colore oculus mundi
Lithuanian:Opalas
Norwegian (Bokmål):Opal
Polish:Opal
Portuguese:Opala
Romanian:Opal
Russian:Опал
Simplified Chinese:蛋白石
Slovak:Opál
Slovenian:Opal
Spanish:Ópalo
Neslita
Rumanita
Vidrita
Swedish:Opal
Traditional Chinese:蛋白石
Turkish:Opal
Ukrainian:Опал
Vietnamese:Đá opal
Varieties:
AlumocalciteAmatiteAmber OpalAndean OpalAndenopal
Bandfire OpalBlack OpalBlue OpalBone OpalBoulder Opal
Cachalong OpalCherry OpalChrysopalChrysopal (of Schumann)Claro Opal
Common OpalContra Luz OpalCrystal OpalDiatomiteFiorite
Fire OpalForcheriteGeyseriteGirasolGold Opal
Harlequin OpalHoney OpalHungarian OpalHydrophaneIsopyre
Jasper OpalJelly OpalLechosos OpalLemon OpalLevin Opal
Lluvisnando opalMascareigniteMeniliteMexican Fire OpalMilk Opal
Moss OpalMother of OpalMother of Pearl OpalMountain OpalOnyx Opal
Oolitic OpalOpal MatrixOpal-AGOpal-ANOpal-Agate
Opal-COpal-CTOpal-JasperOpalinePainter Boulder
Pineapple OpalPinfire OpalPipe OpalPitch OpalPrase Opal
Precious Fire OpalPrecious OpalPyrophaneQuinzite OpalRadiolite Opal
Red Flash OpalResin OpalShell OpalSlocum StoneWash Opal
Wax OpalWhite OpalWood OpalYowah Nut

Other Information

Fluorescence in UV light:Yellow to green (uranyl)
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:Gemstones

References for Opal

Reference List:

- +
Jones, J.B. and E.R. Segnit (1971) The nature of opal. I Nomenclature and constituent phases. Journal of the Geological Society of Australia: 18: 57-68.

Anal. Chem. Acta (1994): 286: 107.

Graetsch, H. (1994) Structural characteristics of opaline and microcrystalline silica minerals. In: Reviews in Mineralogy, Volume 29, Silica - Physical behavior, geochemistry and materials applications. Mineralogical Society of America, Washington, D.C.

Li, D., Bancroft, G.M., Kasrai, M., Fleet, M.E., Secco, R.A., Feng,X.H., Tan, K.H., and Yang, B.X. (1994) X-ray absorption spectroscopy of silicon dioxide (SiO2) polymorphs: the structural characterization of opal. American Mineralogist: 79: 622-632.

Lapis Extra No. 10, Opal (1996).

Adamo, I., Ghisoli, C. & Caucia, F. (2010) A contribution to the study of FTIR spectra of opals. Neues Jahrbuch für Mineralogie - Abhandlungen 187, 63-68.

Caucia, Franca; Ghisoli, Christian; Marinoni, Luigi; Bordoni, Valentina (2013): Opal, a beautiful gem between myth and reality. Neues Jahrbuch für Mineralogie - Abhandlungen, 190, 1-9.
Kostov, Rusian I. (2008) Orphic Lithica As A Source Of Late Antiquity Mineralogical Knowledge, Annual Of The University Of Mining And Geology “ST. Ivan Rilski”, Vol. 51, Part I, Geology And Geophysics, p. 109-115.

Mindat.org articles about Opal

Article entries:
Welo Ethiopia Opal Jon Young

Internet Links for Opal

Search Engines:
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  • Look for Opal on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
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  • Fabre Minerals - search for Opal specimens
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  • Fine Minerals from Weinrich Minerals, Inc.
  • Specimens:The following Opal specimens are currently listed for sale on minfind.com.

    Localities for Opal

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Afghanistan
     
    • Badakhshan Province (Badakshan Province; Badahsan Province)
      • Zebak District
        • Sanglich
    Orris, G.J., and Bliss, J.D. (2002): Mines and Mineral Occurrences of Afghanistan. United States Geological Survey Open-File Report 02-110
    • Balkh Province (Balh Province)
      • Chimtal District
    [var: Diatomite] Orris, G.J., and Bliss, J.D. (2002): Mines and Mineral Occurrences of Afghanistan. United States Geological Survey Open-File Report 02-110
    Algeria
     
    • Oran Province
      • Ouillis - Pont du Chelif area
    [var: Menilite] Rocks & Min.: 17:243.
    Angola
     
    • Luanda Province
    [var: Milk Opal] Martins da Pedra collection
    Antarctica
     
    • Eastern Antarctica
      • Victoria Land
    Galli E, Vezzalini G, Quartieri S, Alberti A, Franzini M (1997) Mutinaite, a new zeolite from Antarctica: the natural counterpart of ZSM-5, Zeolites 19, 318-322
    Argentina
     
    • Catamarca
      • Andalgalá Department
    Raúl Jorge Tauber Larry photo and collection
    Raúl Jorge Tauber Larry
    Raúl Jorge Tauber Larry (1971). Informe personal de la visita a la Estancia "´Cóndor Huasi" en Las Estancias Departamento Andalgalá, Provincia de Catamarca, Argentina.
      • Antofagasta de la Sierra Department
    Raúl J. Tauber Larry
      • Belen Department
    [var: Opal-AN] Padrón de Minas de la Provincia de Catamarca.
    • Chubut
      • Cushamen Department
    Padrón de Minas de la Provincia de Chubut (2005).
      • Gastre Department
    Padrón de Minas de la Provincia de Chubut (2005).
      • Languiñeo Department
    [var: Opal-AN] Padrón de Minas de la Provincia de Chubut (2005).
      • Pichiñán
    [var: Wood Opal] Raúl Jorge Tauber Larry C. T. Friz, F. Rodrigo y P.N. Stipanicic - Recursos y posibilidades Uraníferas en Argentina. Session 2.11 P/405. Comision Nacional de Energia Atomica. Victorio Angelelli (1958) Los minerales de Uranio sus yacimientos y prospección. Departamento de Geología y Minería. Comision Nacional de Energia Atomica.
    ARAGON, E. et al. Petrogenesis of thundereggs in Eocene rhyolite domes of central Chubut, Patagonia. Rev. Asoc. Geol. Argent. [online]. 2006, vol.61, n.3, pp. 347-354.
      • Telsen Department
    Padrón de Minas de la Provincia de Chubut (2005).
    • Córdoba
    [var: Opal-AN] LEAL, P.R.; CORTONA, O. y PAGAN, F.J.. Vetas de cuarzo en el sur de Santiago del Estero. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.2, pp. 389-401
      • Punilla Department
        • Tanti
          • Cerro Blanco pegmatite district
    Alfredo Petrov specimens
      • San Alberto Department
        • Mina Clavero
    [var: Milk Opal] C. Lemanski, Jr. (re-entry of lost Mindat data).
      • Sierra de Ambargasta
    LEAL, Pablo Rodrigo and GONZALEZ, María Paz. Mineralogy and fluid inclusion of LaBaritina: theuppermost sector of the manganese mineralization of sierra de Ambargasta, province of Córdoba. Rev. Asoc. Geol. Argent. [online]. 2009, vol.64, n.4, pp. 672-684
    • Entre Ríos
    [var: Wood Opal] Juan Carlos Lodovichi
    Raúl Jorge Tauber Larry (1967). Visita al arroyo Espinillo en la Provincia de Entre Ríos.
    Raúl Jorge Tauber Larry (1967). Visita al arroyo Espinillo en la Provincia de Entre Ríos.
    • Jujuy
    Milka K. de Brodtkorb (2002) Las Especies Minerales de la Republica Argentina. Vol. 1 (elements, sulphides and sulphosalts). (Asociacion Mineralogica Argentina)
    • La Rioja
    LEAL, P.R.; CORTONA, O. y PAGAN, F.J.. Vetas de cuarzo en el sur de Santiago del Estero. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.2, pp. 389-401
      • Coronel Felipe Varela Department
    Ra{ul J. Tauber Larry
    • Mendoza
      • Malargüe Department
        • Altiplano de Payún Matru
    [var: Opal-AN] Alfredo Petrov collection
    • Río Negro
    American Mineralogist (1978) 63, 1175-1181
    • Salta
      • La Poma Department
    A. G. Quiroga y T. Ruíz (1994). Mimetesita, Pb5[Cl(AsO4)3] de la mina Diana, dpto. La Poma, provincia de Salta, Argentina. 2da Reunión de Mineralogía y Metalogenia. Instituto Nacional de Recursos Mineros, UNLP. Publicación 3:325-335.
    • San Juan
      • Valle Fértil Department
    Raúl J. Tauber Larry
    • San Luis
      • Coronel Pringles Department
        • Totoral pegmatitic field
          • La Florida
            • San Luis Mine
    Černý, P., Galliski, M. A., Oyarzábal, J. C., Teertstra, D. K., Chapman, R., MacBride, L., & Ferreira, K. (2003). Stranded and equilibrated assemblages of late feldspars in two granitic pegmatites in the Pampean Ranges, Argentina. The Canadian Mineralogist, 41(4), 1013-1026.
    • Santa Cruz
      • Deseado Department
    Raúl Jorge Tauber Larry
    Aliotta, G., Garrido, M., Gómez, C y Luna, L. 1996. Estudio de zeolitas de la zona de “Madre e Hija” (Santa Cruz). 3ª Reunión de Mineralogía y Metalogenia. Instituto de Recursos Minerales, UNLP. Publicación 5: 9-16.
      • Macizo del Deseado
    DEL BLANCO, Miguel et al. Characteristicsof a shallow epithermal mineralization in the Deseado Massif, Patagonia. Rev. Asoc. Geol. Argent. [online]. 2009, vol.64, n.3, pp. 373-382.
    • Santiago del Estero
    LEAL, P.R.; CORTONA, O. y PAGAN, F.J.. Vetas de cuarzo en el sur de Santiago del Estero. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.2, pp. 389-401
    LEAL, P.R.; CORTONA, O. y PAGAN, F.J.. Vetas de cuarzo en el sur de Santiago del Estero. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.2, pp. 389-401
    LEAL, P.R.; CORTONA, O. y PAGAN, F.J.. Vetas de cuarzo en el sur de Santiago del Estero. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.2, pp. 389-401
    LEAL, P.R.; CORTONA, O. y PAGAN, F.J.. Vetas de cuarzo en el sur de Santiago del Estero. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.2, pp. 389-401
    Raúl Jorge Tauber Larry
    Sub secretaría de Minerái de la Nación (1974). Reporte técnico. Argentina.
      • Graneros Department
        • Cerro Quico
    Raúl Jorge Tauber Larry
    [var: Wood Opal] Raúl Jorge Tauber Larry
        • Amaicha del Valle District
    [var: Wood Opal] Raúl Jorge Tauber Larry
    [var: Wood Opal] Raúl Jorge Tauber Larry
    Atlantic Ocean
     
    • Mid-Atlantic Ridge complex
      • Sierra Leone fracture zone
        • Markov Deep
    Sharkov, E.V., Abramov, S.S., Simonov, V.A., Krinov, D.I., Skolotnev, S.G., Bel’tenev, V.E., and Bortnikov, N.S. (2007): Geology of Ore Deposits 49(6), 467-486.
    S. M. Sudarikov and S. V. Galkin Geochemistry of the Snake Pit vent field and its implications for vent and non-vent fauna Geological Society, London, Special Publications 1995, 87:319-327
      • Trans-Atlantic Geotraverse hydrothermal field (TAG)
    Petersen, S., Herzig, P.M., and Hannington, M.D. (2000): Mineralium Deposita 35, 233-259.
    Australia
     
    • New South Wales
      • Bathurst Co.
        • Carcoar
    Liversidge 1887, Minerals of New South Wales
      • Beresford Co.
        • Snowy Mts district
      • Clarendon Co.
        • Gundagai
          • Coolac
    [var: Opal-AN] Minerals in podiform chromitites - Tumut Serpentinite Province, Southern New South Wales, Graham, Franklin and Marshall, 2001, Australian Journal of Mineralogy 7(1).
      • Cumberland Co.
        • Prospect (Prospect Hill)
    Tschernich, R. (1992): Zeolites of the World, P.48; Min Rec (1994) 25:185-194
      • Finch Co.
        • Collarenebri
        • Cumborah
    [Clark, 1993 - "Hey's Mineral Index"]
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    - Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    - Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    - Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville. - Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    aracic
    Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    aracic
    Aracic, Stephen (1999), Rediscover Opals in Australia, published 1999 by the Kingswood Press.
    Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
    Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
    Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
    Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
    aracic
    - Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram. - Australian Opal Centre web site http://www.australianopalcentre.com/
    aracic
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.; Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
    Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
    aracic
        • Wyoming Station
    aracic
      • Georgiana Co.
      • Macquarie Co.
        • Port Macquarie
      • Murchison Co.
        • Mehi
    aracic
      • Narran Co.
        • Angledool
    Refs. Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.
      • Pottinger Co.
    [var: Opal-AN] Specimen in collection
      • Rous Co.
      • St Vincent Co.
        • Ulladulla
      • Wentworth Co.
        • Wentworth
          • Kulcurna Station
          • Nampoo Station
      • Yancowinna Co.
    No reference listed
    [var: Opal-AN] Australian Min. 3:1 (1997)
        • Broken Hill District
          • Northern Section
    [var: Opal-AN] The Daydream Mine, G.D. Grose, Bungala Press 2002. The reference refers to minerals collected at the mine and identified by John Leach.
      • Yungnulgra Co.
        • Gemville
    aracic
    No reference listed
    • Northern Territory
      • Central Desert Shire
    [Precious Opal var: Boulder Opal]
      • Barcoo Shire
    Natural History Museum, London
    http://en.wikipedia.org/wiki/Jundah,_Queensland
    http://en.wikipedia.org/wiki/Jundah,_Queensland
      • Bulloo Shire
        • McKinley Co.
          • Bulloo River
            • Blackwater Creek
    [Precious Opal] Rocks & Min.: 8:15.
          • Listowel Downs
    [Precious Opal] Rocks & Min.:8:4.
      • Burke Shire
        • Burketown
    [var: Opal-AN]
      • Gold Coast City Shire
        • Coolangatta
      • Mount Isa - Cloncurry area
        • Cloncurry District
    [var: Opal-AN] Graham Lee Collection
        • Gunpowder District
          • Mount Gordon
    Richardson, S.M. and Day, A.D. (1997) Geology of the Esperanza copper deposit. Proceedings of the 3rd International Mining Geology Conference, Launceston. pg. 51-56
        • Mary Kathleen district
    [var: Opal-AN] Personal collection and shown on photo
      • Paroo Shire
      • Quilpie Shire
        • Kyabra Co.
          • Keeroongooloo
    Rocks & Min.:8:15.
    [Precious Opal var: Boulder Opal]
    [Precious Opal] Martins da Pedra collection
      • Sunshine Coast Region
      • Western Downs Region
        • Dalby
    [var: Opal-AN]
        • Wambo Shire
          • Kaimkillenbun
    [var: Opal-AN]
      • Winton Shire
    Rob Lavinsky specimen
    • South Australia
      • Central North
    No reference listed
    Barnes, L.C., (1992), Opal: South Australia's gemstone, Dept. of Mines and Energy, Geological Survey of South Australia, [Parkside, S. Aust.].
    Barnes, L.C., (1992), Opal: South Australia's gemstone, Dept. of Mines and Energy, Geological Survey of South Australia, [Parkside, S. Aust.].
        • Stuart Creek
      • Eyre Peninsula
        • Middleback Range
          • Iron Knob
    [var: Opal-AN] Minerals of Iron Monarch, Glyn L. Francis
      • Flinders Ranges
        • North Flinders Ranges
    [var: Opal-AN] Steve Sorrell Collection; Steve Sorrell Collection
    [var: Opal-AN]
            • Mt Painter area
    [var: Opal-AN] 2003, Brugger, J., Ansermet, S. & Pring, A. ' Uranium minerals from Mt Painter, Northern Flinders ranges, South Australia' Australian Journal of Mineralogy, vol. 9, n°1, pp 15-31
          • Vulkathunha - Gammon Ranges National Park
    [var: Opal-AN] Pers. Comm. M. Willoughby. Found on specimen with Olivenite. Collection of M. Willoughby.
      • Mt Lofty Ranges
        • North Mt Lofty Ranges
          • Barossa Valley
            • Angaston
    Gee, L.C.E. & Brown, H.Y.L., (1908), Record of The Mines of South Australia, 4th ed., Government Printer, Adelaide, South Australia.
    Record of Mines - Mine Summary Card No:13, SI5409
          • Burra
    No reference listed
          • Spalding
    [var: Opal-AN] Personal collection of M. Willoughby.
        • South Mt Lofty Ranges (Adelaide Hills)
      • North West Province
        • Mintabie district
      • Northeast
      • Olary Province
        • Boolcoomatta Reserve (Boolcoomata Station; Boolcoomatta)
    [var: Opal-AN] No reference listed
        • Plumbago Station
    [var: Opal-AN] J Bosworth, Minsoc SA 1993 Excursion Report
      • Stuart Shelf
        • Andamooka Ranges
    see picture
    No reference listed
    • Tasmania
      • Avoca-Royal George district
    [var: Opal-AN] Mathew Latham collection
      • Devonport district
    [var: Opal-AN] http://www.crocoite.com/locationbulletins/part1/zeolites.pdf
      • Hobart
        • Mt Nelson
    Bottrill and Baker, 2008, Catalogue of Minerals of Tasmania
        • Risdon
      • Huon district
    No reference listed
        • Weld river
    Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
      • Marrawah district
        • Redpa
    http://www.crocoite.com/locationbulletins/part1/zeolites.pdf
      • Southern Islands
    Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
      • Waratah district
        • Waratah
    Bottrill, unpub.
    • Victoria
      • Ballarat
    [var: Opal-AN] Steve Sorrell Collection
    [var: Opal-AN] Toby Billing collection
      • Benambra
        • Morass Creek gorge
    [var: Opal-AN] Steve Sorrell collection
      • Berwick
      • Bundoora
    [var: Opal-AN]
      • Campaspe Shire
        • Corop
    [var: Opal-AN] crocoite.com
      • City of Greater Geelong
        • Anakie
    [var: Opal-AN] Museum Victoria Mineralogy Collection
    [var: Opal-AN] Museum Victoria Mineralogy Collection
      • Corangamite Shire
        • Skipton
          • Mt. Widderin (Anderson's Hill)
    Webb, J. A., Joyce, E. B., & Stevens, N. C. (1982). Lava caves of Australia. In Proceedings of the Third International Symposium on Vulcanospeleology. International Speleological Foundation, Seattle. p74-85.
      • Latrobe City
        • Yinnar
      • Lilydale
    [var: Opal-AN] Steve Sorrell Collection
    Alan Goldstein colln.
    [var: Opal-AN] specimen in collection
    [var: Opal-AN] ex Joan Lamond Collection
      • Mansfield
    [var: Opal-AN] W.D.Birch & D.A.Henry 1993. Phosphate Minerals of Victoria. The Mineralogical Society of Victoria special publication No. 3 pp 67-77
      • Pyrenees Shire
        • Avoca
          • Lillicur
      • Rural City of Wangaratta
    [var: Opal-AN] Steve Sorrell Collection
        • Greta South
    [var: Opal-AN]
    [var: Opal-AN] Judy Rowe Collection
    [var: Opal-AN] Judy Rowe Collection
      • Swan Hill Rural City
        • Lake Boga
    [var: Opal-AN] Steve Sorrell Collection
    [var: Opal-AN] Steve Sorrell Collection
    • Western Australia
      • Coolgardie Shire
        • Binneringie Station
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
        • Coolgardie
    No reference listed
    [var: Diatomite] Geology of the Northern Perth Basin, Western Australia- a field guide; A.J. Mory, D.W. Haig, S. Mcloughlin, R.M. Hockisly; Department of Industry and Resources; Perth 2005
        • Cervantes
    [var: Diatomite] Geology of the Northern Perth Basin- a field guide; A.J. Mory, D.W. Haig, S. McLoughlin, R.M. Hocking; Dept of Industry and Resources, Western Australian Government; Perth 2005; p51
      • Dundas Shire
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V., (2013): Gemstones of WA, Geological Survey of WA
      • East Pilbara Shire
    [var: Opal-AN] J M Bennett Collection
      • Gingin Shire
    On Gearkstite at Gingin, Western Australia: Mineralogical Magazine, Vol 19, May 1920, pp23-39
      • Goomalling Shire
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
      • Kalgoorlie-Boulder Shire
        • Bulong
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V. (2013): Gemstones of WA, Geological Survey of WA
        • Cowarna Downs Station
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of Western Australia, Geological Survey of Western Australia
        • Ora Banda
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
      • Meekatharra Shire
        • Milgun Station
    Peter Downes, WA Museum
        • Mount Gould Station
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V(2013): Gemstones of WA, Geological Survey of WA
        • Sylvania Station
    Grguric, B.A., Jones, S., Gray, S. (in press) Chromian clinochlore from Coobina, Pilbara Province, Western Australia. Australian Journal of Mineralogy.
      • Murchison Shire
        • Byro Station
    Fetherston, J., Stocklmater, S., Stocklmayer, V(2013): Gemstones of WA, Geological Survey of WA
    Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
    Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
        • Nookawarra Station
    [var: Common Opal] Fetherston, J, Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
      • Northam Shire
        • Northam
    [var: Opal-AN] Fetherston, J., Stocklmayer, S., Stocklmayer, V(2013): Gemstones of WA, Geological Survey of WA
      • Perenjori Shire
        • Karara Conservation Reserve
    [var: Opal-AN] Pegmatites of Western Australia; M.I. Jacobson, M.A. Calderwood, B.A. Grguric; Hesperian Press, Perth, 2007
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V(2013): Gemstones of WA, Geological Survey of WA
        • Weelhamby Lake
    [var: Common Opal] Fetherston, J., Stocklmayer, S., Stocklmayer, V.(2013): Gemstones of WA, Geological Survey of WA
    Simpson (1931-1932) Journal of the Royal Soceity of Western Australia: 18: 69; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 936.
      • Upper Gascoyne Shire
        • Mount Phillip Station (Mount Phillips Station)
    Kim Macdonald
        • Yinnietharra (Yinnietharra Station; Yinnetharra)
    [var: Opaline] Moolooite, a Naturally Occurring Hydrated Copper Oxalate; R.M. Clarke and I.R. Williams; Mineralogical Magazine, June 1986, Vol 50, pp 295-298
          • Tomkap tourmaline mines (Soklich)
    Bridge, P. J. , Daniels, J. L. & Pryce, M. W. (1977): The dravite crystal bonanza of Yinnietharra, Western Australia. Mineralogical Record 8 (2): 109-111
    Fetherston, J.M., Stocklmayer, S., Stocklmayer, V.C.(2013): Gemstones of Western Australia- mineral resources bulletin 25, Geological Survey of Western Australia (2013): 57
      • Westonia Shire
        • Westonia
    Simpson, E.S., (1948) Minerals of Western Australia. Volume 1-3. Government Printer, Perth.
      • Yalgoo Shire
        • Paynes Find
    [var: Opal-AN] Pegamtites of Western Australia; M Jacobson, M Calderwood, B Grguric; Hesperian Press, Perth, 2007.
    Austria
     
    • Burgenland
      • Großpetersdorf
        • Badersdorf
    [var: Opal-AN] Natural History Museum Vienna collection; http://www.badersdorf.at/Wirtschaft/holler/minerale.htm
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
      • Oberpullendorf
        • Kobersdorf
          • Pauliberg
    [var: Opal-AN] U. Kolitsch, W. Postl, H.-P. Bojar and W. Trattner (2009): Die Mineralvorkommen im Basalt des Pauliberges. In: Autorenkollektiv (Red. M. A. Götzinger und P. Huber) (2009): Die Mineralien des Burgenlandes - Geologie, Mineralogie und mineralische Rohstoffe. – Wissenschaftliche Arbeiten aus dem Burgenland, Band 126, Amt der Burgenländischen Landesregierung, Abteilung 7 - Landesmuseum, Eisenstadt, 83-99.
      • Oberwart
        • Bernstein
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    • Carinthia
      • Friesach - Hüttenberg area
        • Hüttenberg
          • Hüttenberger Erzberg
    H. Meixner: Der Karinthin 9:184-189 (1950)
      • Gurktaler Alpen
        • Flattnitz
    [var: Opal-AN] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
        • Radenthein
          • Millstätter Alpe
    Pichler (2009)
      • Klagenfurt
        • Ehrentaler Berg
    F. Brandstätter: Carinthia II 184./104.:248-252 (1994)
        • Kreuzbergl massif
          • Falkenberg
    [var: Opal-AN] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
      • Koralpe
        • Großer Speikkogel - Steinschneider area
    G. Weissensteiner: Der Karinthin 63:183-186 (1970)
        • Kamp
          • Fraßgraben
    G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
        • Moschkogel - Weinebene area
          • Brandrücken
    [var: Opal-AN]
      • Millstatt lake ridge
        • Fresach
          • Laas
    [var: Opal-AN] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
      • Saualpe
        • Bad St Leonhard
          • Mica Mines
    [var: Opal-AN] F.Walter (1984)
      • St Paul im Lavanttal
        • Kollnitz
    G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
      • Villach
        • Zauchen
    H. Meixner: Carinthia II 171./91.:35-36 (1981)
    • Lower Austria
      • Mostviertel
        • Karlstetten
    HAMMER & ĆORIĆ (2007): 1501) Chalcedon von Obermamau nördlich von St. Pölten, Niederösterreich. Pp. 171-173 in NIEDERMAYR et al. (2007): Neue Mineralfunde aus Österreich Austria LVI. – Carinthia II, 197./117.: 149-190. (in German)
      • Waldviertel
        • Brunn an der Wild
          • Atzelsdorf
    Pristacz, H., jun., Kolitsch, U., Löffler, E., Knobloch, G., Prayer, A. & Thinschmidt, A. (2011): 1696) Calcit, Natrojarosit, Palygorskit, Pyrit, Siderit und andere Mineralien aus dem Marmorbruch Atzelsdorf, Brunn an der Wild, Waldviertel. Pp. 160-161 in Niedermayr, G. et al. (2011): Neue Mineralfunde aus Österreich LX. Carinthia II, 201./121., 135-186.
          • Dietmannsdorf an der Wild
    Kugler, A. (1995): Waldviertel Aktuell: Dietmannsdorf. MEFOS Nr. 10, 4.
        • Dobersberg
    Huber, S., Huber, P. (1977): Mineralfundstellen. Band 8: Oberösterreich, Niederösterreich und Burgenland. - 271 p., München - Innsbruck (Christian Weise, Pinguin).
        • Drosendorf-Zissersdorf
          • Pingendorf
    Niedermayr, G. (1990): Eine bemerkenswerte Zeolithparagenese aus einem Serpentinitsteinbruch bei Pingendorf in Niederösterreich. Mineralien-Welt, 1 (2), 31-34.
    [var: Opal-AN] Harald Schillhammer collection
    Albert Prayer collection
        • Gars am Kamp
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
        • Geras
          • Kottaun
    [var: Opal-AN] Kolitsch, U., Knobloch, G., Schillhammer, H. & Löffler, E. (2013): 1814) Aikinit, Albit, Amphibol, Andradit, Azurit, Chalkopyrit, Epidot, Hedenbergit, Hyalith, Magnetit, Malachit, Scheelit, Titanit und Quarz aus einem neuen, kleinen Steinbruch nördlich Kottaun bei Geras, Waldviertel, Niederösterreich. Pp. 127-128 in Niedermayr, G. et al. (2013): Neue Mineralfunde aus Österreich LXII. Carinthia II, 203./123., 91-146.
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
        • Maissau
          • Limberg
    [var: Diatomite] Götzinger, M. A., Beran, A. & Libowitzky, E. (1994): Exkursion A: Mineralvorkommen und Lagerstätten im östlichen Waldviertel. Mitt. Österr. Mineral. Ges. 139, 389-405.
          • Oberdürnbach
    [var: Diatomite] Götzinger, M. A., Beran, A. & Libowitzky, E. (1994): Exkursion A: Mineralvorkommen und Lagerstätten im östlichen Waldviertel. Mitt. Österr. Mineral. Ges. 139, 389-405.
        • Mühldorf
          • Amstall
    [var: Opal-AN] peter neschen collection
    [var: Milk Opal] Natural History Museum Vienna collection
        • Persenbeug-Gottsdorf
          • Loja
    Löffler, E. & Kolitsch, U. (2011): Die Mineralien der Loja bei Persenbeug, Niederösterreich(I). Mineralien-Welt. 22 (3): 73-84
        • Raabs an der Thaya
          • Eibenstein an der Thaya
    [var: Opal-AN] Harald Schillhammer collection
    [var: Opal-AN] Kolitsch, U. & Schillhammer, H. (2014): 1881) Amphibol, Apatit, Chabasit, Chlorit, Diopsid, Epidot, Granat, Hamatit, Hyalith, Ilmenit, Limonit, Magnetit, Mikroklin, Pyrit, Quarz, Rutil und Titanit vom Gimpelfeld bei Raabs, Waldviertel, Niederösterreich. P. 116 in Niedermayr, G. et al. (2014): Neue Mineralfunde aus Österreich LXIII. Carinthia II, 204./124., 65-146.
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
        • Röhrenbach
          • Winkl
    Kolitsch, U., Brandstätter, F., Löffler, E., Knobloch, G., Prayer, A., Pristacz, H., jun. & Thinschmidt, A. (2011): 1697) Die Mineralien der Marmorbrüche bei Winkl, Neupölla, Waldviertel. Pp. 161-163 in Niedermayr, G. et al. (2011): Neue Mineralfunde aus Österreich LX. Carinthia II, 201./121., 135-186.
        • St Leonhard am Hornerwald
          • Dürrenberg (Dürnberg)
    [var: Milk Opal] R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    peter neschen collection
      • Weinviertel
        • Ravelsbach
          • Parisdorf
    [var: Diatomite] ötzinger, M. A., Beran, A. & Libowitzky, E. (1994): Exkursion A: Mineralvorkommen und Lagerstätten im östlichen Waldviertel. Mitt. Österr. Mineral. Ges. 139, 389-405.
    • Salzburg
      • Hohe Tauern
        • Felben valley
          • Scheelite deposit
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
        • Gastein valley
          • Bad Gastein
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
          • Böckstein
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
          • Naßfeld valley
            • Kniebeißgraben
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
            • Kreuzkogel massif
              • Radhausberg
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
          • Siglitz - Bockhart area
            • Siglitz - Bockhart Gold Mining District
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
        • Habach Valley
          • Nasenkopf
            • Leckbachgraben (Leckbachrinne)
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs (1989)
        • Obersulzbach valley
          • Hopffeld area
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs (1989)
        • Stubach valley
          • Enzingerboden
            • Tauernmoos lake
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
        • Untersulzbach valley
          • Abichl Alp - Beryller area
    [var: Opal-AN] R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
      • Lungau
        • Schladminger Tauern
          • Lessach valley
            • Lessach
    A. Strasser: Die Minerale Salzburgs (1989)
      • St Johann im Pongau
        • Mitterberg District
    [var: Opal-AN] A. Strasser: Die Minerale Salzburgs, 1989
    • Styria
      • Bad Gleichenberg
        • Gossendorf
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
        • Klause
    [var: Opal-AN] Aufschluss 1972(SB), 52-55
        • Wilhelmsdorf
    [var: Opal-AN] peter neschen collection
      • Bad Radkersburg
        • Klöch
    [var: Opal-AN] R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
      • Bruck an der Mur
        • Kapfenberg
          • Tanzenberg
    Postl, W. et al. (1985)
        • Laming valley
          • Oberdorf an der Laming
            • Magnesite deposit
    Gerald Gesselbauer (2010)
    Gerald Gesselbauer (2010)
      • Fischbacher Alpen
        • Rettenegg
          • Prinzkogel (Prinzenkogel)
            • Prinzkogel mines
              • Southern District
    Jakely, D. et al. (2008)
      • Graz
        • Wildon
          • Weitendorf
    [var: Opal-AN] Aufschluss 1972(SB), 76-79
      • Knittelfeld
        • Ingering valley
    [var: Forcherite] R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
      • Koralpe
        • Deutschlandsberg
          • Glashütten
    Natural History Museum Vienna collection
    [var: Opal-AN] Weninger, H. (1976): Mineral-Fundstellen Band 5: Steiermark und Kärnten. Chr. Weise Verlag, München, 231 pp.
          • Osterwitz
    [var: Opal-AN] R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    [var: Opal-AN] Koritnig, S. ZB1. f. Min. A,1939
        • Eibiswald
          • Sankt Oswald ob Eibiswald
            • Krumbach
    [var: Opal-AN] Meixner, H. (1937) : Neue Mineralfunde in den österreichischen Ostalpen. IX. In : Mitteilungen des Naturwissenschaftlichen Vereines für Steiermark, Band 74, 1937
        • Schwanberg
    [var: Opal-AN] Aufschluss 1972(SB), 43-47
          • Schwarze Sulm
    [var: Opal-AN] Weissensteiner, G. (1975) : Uranmineralien der Koralpe. In : Mineralogie Mitteilungen Band 42,Joanneum, Graz, p.27(283).
      • Leoben
    Aufschluss 1972(SB), 80-83
      • Liesing - Palten valley
        • Wald am Schoberpass
    Josef Taucher & Christine Elisabeth Hollerer (2012): Chrysokoll und Opal mit Tetraedrit aus dem Steinbruch der Gebrüder Haider nördlich Wald am Schoberpaß, Steiermark. Der Steirische Mineralog 26, 54.
      • Murau
        • Katsch an der Mur
    [var: Opal-CT] http://www.markasit070752.ws24.cc/text_62520295_60708465_19667850_deutsch.html
      • Oberhaag
        • Lieschengraben
    [var: Opal-AN] peter neschen collection
      • Stubalpe
        • Hochgössnitz
    [var: Opal-CT] A.Weiß (1972)
    • Upper Austria
      • Linz-Land
        • Enns
    [var: Opal-AN] Peter Neschen Collection
        • Traun
          • Pucking
    [var: Opal-AN] R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
      • Mühlviertel
        • Rohrbach
          • Arnreit
    [var: Opal-AN] - Josef Schadler, in:(Handschriftliche Aufzeichnungen).
      • Schärding
        • Gopperding
    [var: Opal-AN] Kolitsch, U. et al. (2008)
      • Steyr-Land
        • St. Ulrich bei Steyr
    [var: Opal-AN] Peter Neschen Collection
    Bolivia
     
    • La Paz Department
      • Inquisivi Province
        • Caracoles district
    Kempff, O., Paar, W.H., Tawackoli, S.: "Minerales de Bolivia", 115pp (La Paz, 2009)
      • Loayza Province
        • Sapahaqui
          • Caracato
    [var: Opal-AN] Ahlfeld, F. & Muñoz-Reyes, J. (1955) Las Especies Minerales de Bolivia
      • Pacajes Province
        • Berenguela District
    USGS Bulletin # 1975, p. 247.
      • Sicasica Province
    [var: Diatomite] Kempff, O., Paar, W.H., Tawackoli, S.: "Minerales de Bolivia", 115pp (La Paz, 2009)
    • Oruro Department
      • Carangas Province
        • Todos Santos District
    USGS Bulletin # 1975, p. 248.
      • Cercado Province
        • Oruro city
    USGS Bulletin # 1975, p. 269.
      • Dalence Province
        • Huanuni
    Federico Ahlfeld and Alejandro Schneider-Scherbina (1964) Los Yacimientos Minerales y de Hidrocarburos de Bolivia, Boletín No. 5 (Especial), page 170 (Ministerio de Minas y Petroleo, La Paz)
    [MinRec 32:472]
    Ahlfeld, F. & Schneider-Scherbina, A. (1964) Los Yacimientos Minerales y de Hidrocarburos de Bolivia.
      • Poopó Province
    [var: Diatomite] Salomon Rivas y Federico Ahlfeld (1998) Los Minerales de Bolivia y sus Parajes. (Santa Cruz)
    • Potosí Department
      • Antonio Quijarro Province
        • Tomave
    [var: Opal-AN] Salomon Rivas y Federico Ahlfeld (1998) Los Minerales de Bolivia y sus Parajes. p. 535 (Santa Cruz)
      • Chayanta Province
        • Macha area
    [var: Opal-AN] Federico Ahlfeld and Jorge Muñoz Reyes (1955) Las Especies Minerales de Bolivia. (Banco Minero de Bolivia, 180 pp)
    [var: Opal-AN] Federico Ahlfeld and Jorge Muñoz Reyes (1955) Las Especies Minerales de Bolivia. (Banco Minero de Bolivia, 180 pp)
      • Cornelio Saavedra Province
        • Machacamarca District (Colavi District)
    Ahlfeld & Munoz Reyes (1955): Las Especies Minerales de Bolivia
      • Daniel Campos Province
        • San Pablo de Napa
    [var: Opal-AN] Alfredo Petrov collection
    www.mineralmundi.com
      • Nor Lípez Province
    www.mineralmundi.com (in the sulphur deposits)
      • Rafael Bustillo Province (Bustillos Province)
        • Llallagua
    Hyrsl, J. & A. Petrov (2006): Famous Mineral Localities: Llallagua, Bolivia. Mineralogical Record. 37: 117-162
    [MinRec 32:481]
      • Sud Lípez Province
    [var: Diatomite] USGS Bulletin # 1975, p. 258 (1992)
    Federico Ahlfeld and Alejandro Schneider-Scherbina (1964) Los Yacimientos Minerales y de Hidrocarburos de Bolivia. (Ministerio de Minas y Petroleo, La Paz)
        • San Antonio de Lípez
    Geology and Mineral Resources of the Altiplano and Cordillera Occidental, Bolivia (USGS Bulletin no. 1975)
        • San Pablo de Lípez
          • Santa Isabel district
    Donald Richter, et al (1992) USGS Bulletin 1975, p.163.
    Brazil
     
    • Bahia
      • Boa Nova
    Mineralogical Record (1977) 8:382-387
    F. Zaccarini, G. Garuti and R.F. Martin (2006): Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil). Geologica Acta 4, 461-469. [http://www.geologica-acta.com/pdf/vol0404a04.pdf]
      • Capim Grosso
    Dutra, C. V., & Formoso, M. L. L. (2011). Considerações sobre os elementos terras raras em apatitas. Geochimica Brasiliensis, 9(2).
      • Guajeru (Santa Rosa de Condeúba)
    [var: Opal-AN] Mineralogical Record (1977) 8:382-387
    [var: Wood Opal] Martins da Pedra collection
      • Doce valley
        • Galiléia
          • Laranjeiras
    [var: Opal-AN] [MinRec 32:411]
          • Sapucaia do Norte
    [var: Opal-AN] Cassedanne, J.P. & Baptista, A. (1999): Famous Mineral Localities: The Sapucaia Pegmatite Minas Gerais, Brazil. Mineralogical Record, 30: 347-360 + 365.
    Atencio D, Carvalho F M S, Matioli P A (2004) Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum Mine, Galiléia, Minas Gerais, Brazil. American Mineralogist 89, 721-724
    • Pará
      • São Geraldo do Araguaia
    Revista Brasileira de Geociências, vol.30
    • Paraíba
      • Borborema mineral province
        • Salgadinho
          • São José da Batalha
    [var: Opal-AN] de Brito Barreto, S., & Bretas Bittar, S. M. (2010). Los depósitos de gemas de Brasil: localización, producción e impacto económico. Boletín de la Sociedad Geológica Mexicana, 62(1), 123-140.
    • Paraná
      • Foz do Iguaçu
    Geological Survey Professional Paper 327 (U.S. Department of the Interior, 1959)
    • Piauí
      • Pedro II
    de Brito Barreto, S., & Bretas Bittar, S. M. (2010). Los depósitos de gemas de Brasil: localización, producción e impacto económico. Boletín de la Sociedad Geológica Mexicana, 62(1), 123-140.
    No reference listed
      • Borborema mineral province
        • Parelhas
    [var: Opal-AN] de Brito Barreto, S., & Bretas Bittar, S. M. (2010). Los depósitos de gemas de Brasil: localización, producción e impacto económico. Boletín de la Sociedad Geológica Mexicana, 62(1), 123-140.
    • Rio Grande do Sul
    [var: Fire Opal] www.gemstone.org/gem-by-gem/english/fire.html
    Strieder, A. J., & Heemann, R. (2006). Structural constraints on Paraná basalt volcanism and their implications on agate geode mineralization (Salto do Jacuí, RS, Brazil). Pesquisas em Geociências. Porto Alegre, RS. Vol. 33, n. 1 (2006), p. 37-50.
    • Rondônia
      • Porto Velho
    • Santa Catarina
    [var: Opal-AN] Manfred Bergmann (2009) Lapis, 34, #3, 30-34.
    • São Paulo
      • São Paulo
    American Mineralogist 54:966-969
    Fosfatos e Silicatos Secundários de Urânio de Perus, São Paulo - Atencio, Daniel and Hypolito, Raphael - Revista Brasileira de Geociências, março de 1994
    Bulgaria
     
    • Haskovo Oblast (Khaskovo Oblast)
      • Mineralni Bani Obshtina
    [var: Wood Opal] Marcus Voigt Collection
    [var: Opal-AN] Marcus Voigt Collection
      • Rhodope Mts
    Marchev, P., Downes, H., Thirlwall, M. F., & Moritz, R. (2002). Small-scale variations of 87Sr/86Sr isotope composition of barite in the Madjarovo low-sulphidation epithermal system, SE Bulgaria: implications for sources of Sr, fluid fluxes and pathways of the ore-forming fluids. Mineralium Deposita, 37(6-7), 669-677.
    www.clmc.bas.bg/Annreps/ANNREP8/annrep8.htm.
      • Krumovgrad Obshtina
    Marchev, P.; Singer, B. S.; Jelev, D.; Hasson, S.; Moritz, R.; Bonev, N. (2004): The Ada Tepe deposit: a sediment-hosted, detachment fault-controlled, low-sulfidation gold deposit in the Eastern Rhodopes, SE Bulgaria. Swiss Bulletin of Mineralogy and Petrology, 84, 2004, 59-78. ; Marinova, I. (2008). Morphology of electrum from Khan Krum gold deposit, Krumovgrad goldfield, Eastern Rhodope Mountain, SE Bulgaria. Geologica Macedonica, 2, 111-120.
    http://www.clmc.bas.bg/Annreps/ANNREP8/annrep8.htm
    Anton Ivanov field observation
      • Rhodope Mtn
    http://www.clmc.bas.bg/Annreps/ANNREP8/annrep8.htm
    Tschernich, 1992. Zeolites of the World
    • Pazardzhik Oblast (Pazardjik Oblast)
      • Rakitovo Obshtina
    Marcus Voigt Collection
    • Sofiya Town Oblast (Grad Sofia Oblast)
      • Sofiya Obshtina (Sofia Obshtina)
    I. Kostov, V. Breskovska, J. Mincheva-Stefanova, G. Kirov (1964): Minerals of Bulgaria. Sofia, Bulgaria, 540 pp. (in Bulgarian).
    • Yambol Oblast
      • Tundzha Obshtina
    [var: Milk Opal] Marcus Vau Collection
    Cambodia
     
    • Kâmpóng Thum Province (Kampong Thom Province)
    [var: Opal-AN] Economic and Social Commission for Asia and the Pacific (1993) Atlas of Mineral Resources for the Escap Region Cambodia Vol 10 UN.
    Austin, Gordon et al. "World Mining Report". Colored Stone (November–December 2005).
    • Stung Treng Province
      • Khone district
    [var: Opal-AN] Economic and Social Commission for Asia and the Pacific (1993) Atlas of Mineral Resources for the Escap Region Cambodia Vol 10 UN.
    Canada
     
    • British Columbia
      • Kamloops Mining Division
        • Mt. Savona
          • Deadman's River
    Tschernich - Zeolites of the World (1992)
      • Omenica Mining Division
        • Burns Lake
    www.em.gov.bc.ca/cf/minfile
        • Troitsa Peak
    MINFILE No 093E 120
      • Vernon Mining Division
        • Vernon
    www.em.gov.bc.ca/cf/minfile; Simandl, G. J., Hancock, K. D., Callaghan, B., Paradis, S., & Yorke-Hardy, R. (1997). Klinker Precious Opal Deposit, South Central British Columbia, Canada-Field Observations and Potential Deposit-Scale Controls. British Columbia Ministry of Energy and Mines, 321-327.
    • Manitoba
      • Souris
    [var: Wood Opal] John Sinkankas (1959) Gemstones of North America: Volume 3; Phillips, K. A. (1978) Minerals of Manitoba: Vol 1 Nonmetallic and pegmatic. Manitoba Mineral Resources Division Educational Series 78/1.
    • Northwest Territories
    CanMin 41:117-137
    • Nova Scotia
      • Cumberland Co.
    J.N. Wingard.
      • Lunenburg Co.
    H. Piers, "The Occurrence of Opal in Granite near New Ross, Lunenburg County, N.S.", Proceedings of the Nova Scotian Institute of Science, vol. 12, pt. 4, 446-449, 1910.
    • Ontario
      • Renfrew Co.
        • Lyndoch Township
    www.ontariominerals.com/berylpit.htm
    • Québec
      • Abitibi-Témiscamingue
        • Témiscamingue RCM
          • Les Lacs-du-Témiscamingue
    Ansell H G, Roberts A C, Plant A G, Sturman B D (1980) Gittinsite, a new calcium zirconium silicate from the Kipawa agpaitic syenite complex, Quebec, The Canadian Mineralogist 18, 201-203
      • Montérégie
        • La Vallée-du-Richelieu RCM
          • Mont Saint-Hilaire
    http://membres.lycos.fr/quebecminerals/tripbluequartz.html
        • Lajemmerais RCM
          • Varennes & St-Amable
    HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.
    Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
    • Yukon Territory
      • Dawson Mining District
    Sabina, A.P. (1972) Rocks & minerals for the collector: The Alaska Highway, Dawson Creek, British Columbia to Yukon/Alaska border. GSC paper 72-32. Reissued (1992) as GSC Miscellaneous Report 50, 98-99.
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
        • Sierra Gorda District
          • Caracoles
    R. S. W. Braithwaite et al.: Min. Mag. 68(3):527-539 (2004)
      • El Loa Province
        • Calama
          • Chuquicamata District
    R.B. Cook: "Famous mineal locality; Chuquicamata, Chile": Mineralogical Record, sept.-oct. 1973
    Rodgers, K. A., Greatrex, R., Hyland, M., Simmons, S. F., & Browne, P. R. L. (2002). A modern, evaporitic occurrence of teruggite, Ca4MgB12As2O28. 18H2O, and nobleite, CaB6O10. 4H2O, from the El Tatio geothermal field, Antofagasta Province, Chile. Mineralogical Magazine, 66(2), 253-259.
    • Atacama Region
      • Copiapó Province
    Sernageomin database 2005;Stgo de Chile
        • Tierra Amarilla
          • Pampa Larga district
    Samples analysed by Dr. Tony Kampf, Curator of LAC Mineralogical Museum, USA
    Economic Geology; January 2005; v. 100; no. 1; p. 131-148
    • Coquimbo Region
      • Elqui Province
        • El Indio deposit
    Jannas R./Araneda R.; "Geología de la veta Indio Sur; una estructura tipo Bonanza del yacimiento El Indio"; Revista Geológica Chilena, 1985, Stgo de Chile.
    China
     
    • Anhui Province
      • Anqing Prefecture
        • Huaining Co.
    Wenya Zhou and Deming Xu (1990): Acta Petrologica et Mineralogica 9(1), 69-77
      • Chizhou Prefecture
        • Qingyang Co.
    Yuanming Pan and Ping Dong (1999): Ore Geology Reviews 15, 177-242.
      • Chuzhou Prefecture
        • Quanjiao Co.
    Pan Fang, Fahui Pan, and Qichai He (1981): Acta Mineralogica Sinica 3(1), 73-77; Wenguang Li (1997): Jilin Geology 16(4), 22-25; Ruishi Yang and Wenguang Li (2001): Geology of Chemical Minerals 23(1), 25-30
      • Wuhu Prefecture
        • Nanling Co.
    Chunhua Wen, Wenyi Xu, Hong Zhong, Qingtian Lü, Zhusen Yang, Shihong Tian, and Yingchao Liu (2011): Mineral Deposits 30(3), 533-546
    • Chongqing Municipality
      • Chengkou Co.
    Gongqin Zhang (1986): Geology and Prospecting 22(7), 10-16
    • Fujian Province
      • Longyan Prefecture
        • Liancheng Co.
          • Liancheng Mn deposit
    Nanlai Zheng, Xingli Mao, and Jiansheng Ding (1986): Geology and Prospecting 22(3), 17-20; Huacai Chen (1989): Geology and Prospecting 25(10), 6-11
        • Shanghang Co.
          • Zijinshan ore field
    http://pubs.usgs.gov/of/2005/1060/PorCu.txt
      • Ningde Prefecture
        • Zhouning Co.
    Yachui Jiang, Henian Chen, Cuanhuai Wu, and Shizhong Chen (1994): Geology and Prospecting 30(4), 21-25
      • Zhangzhou Prefecture
        • Yunxiao Co.
          • Tongbei
    [var: Opal-AN] C. Lemanski, Jr. and Ottens, B., 2005. Tongbei. Spessartine localities, Fujian Province, China. Mineralogical Record, 36 (1): 35-43
    • Gansu Province
      • Jiuquan Prefecture
        • Guazhou Co. (Anxi Co.)
    Laigeng Yang (1989): Geology and Prospecting 25(6), 9-13
        • Subei Co.
    Yuanchao Shen, Ping Shen, Qingdong Zeng, Tiebing Liu, and Guangming Li (2006): Mineral Deposits 25(5), 572-581; Shen Ping, Shen Yuanchao, Liu Tiebing, Li Guangming, and Zeng Qingdong (2008): Mineralium Deposita 43(5), 499-517
    • Guangdong Province
      • Heyuan Prefecture
        • Zijin Co.
    Gongsheng Yan (1987): Mineral Deposits 6(1), 45-55
      • Shaoguan Prefecture
        • Nanxiong Co.
    Liangshu Shu, Ping Deng, Bin Wang, Zhengzhong Tan, Xinqi Yu, and Yan Sun (2004): Science in China, Series D (Earth Sciences), 47(8), 673-688.
        • Shixing Co.
    Liangshu Shu, Ping Deng, Bin Wang, Zhengzhong Tan, Xinqi Yu, and Yan Sun (2004): Science in China, Series D (Earth Sciences), 47(8), 673-688.
        • Wengyuan Co.
    Dahlkamp, F.J., Ed. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156.
    • Guangxi Zhuang Autonomous Region
      • Chongzuo Prefecture
        • Daxin Co.
    Min, M.-Z., Luo, X.-Z., Mao, S.-L., Zheng, D.-Y., and Shen, B.-P. (2002): Ore Geology Reviews 19(1/2), 79-93.
    • Guizhou Province
      • Qianxi'nan Autonomous Prefecture
        • Qinglong Co.
    Yongzhi Zhang and Maorong Zhen (2004): Guizhou Geology 21(2), 99-105
    • Hainan Province (Hainan Island)
      • Changjiang Co.
    Hanzhu Wang (1985): Earth Science, Journal of China University of Geosciences 29(2)
    • Hebei Province
      • Handan Prefecture
        • Wu'an Co.
    Guilin Xu, Xiaolan Shi, and Hongcai Xu (2006): Geology and Prospecting 42(2), 13-18
      • Qinhuangdao Prefecture
        • Qinglong Co.
    http://wrgis.wr.usgs.gov/open-file/of03-220/DATABASE/lode_deposits.txt
    • Heilongjiang Province (Manchuria; Dongbei Region)
      • Heihe Prefecture
        • Xunke Co.
    Zhong Tang, Songqing Ye, and Yanchen Yang (2010): Global Geology 29(3), 400-407
      • Jixi Prefecture
        • Hulin Co.
    Yongwei Huang, Guanghui Li, and Dachao Lu (2010): Global Geology 29(2), 226-233
    Jianguo Yang, Chuanshun Quan, and Xiuli Liu (2005): Gold Science and Technology 13(5), 26-29
      • Yichun Prefecture
        • Jiayin Co.
          • Wulaga Mine
    http://www.portergeo.com.au/database/mineinfo.asp?mineid=mn1061; Guihu Chen, Fuzhou Wang, Yanzhong Wang, Jiguang Xue, Cangjiang Zhang, Yajun Li, and Xiaojun Duan (2012): Gold Science and Technology 20(2), 14-19
    • Henan Province
      • Luoyang Prefecture
        • Luanchuan Co.
          • Nannihu ore field
    Jichang Weng, Yunzheng Zhang, Chaoyong Huang, Wenzhi Li, Beilei Cui, and Mingwei Luo (2010): Geology and Exploration 46(1), 41-48
      • Sanmenxia Prefecture
        • Lingbao Co.
    Guang Wu, Yuchuan Chen, Zongyan Li, Xinsheng Yang, Jun Liu, and Cuijie Qiao (2013): Mineral Deposits 32(4), 809-822
    • Hunan Province
      • Loudi Prefecture
        • Lengshuijiang Co.
    Guozhang Wen, Qiang Wu, Hanyuan Liu, Guozhu Xie, and Xiuliu Lei (1993): Geology and Prospecting 29(7), 20-27
      • Shaoyang Prefecture
        • Shaodong Co.
    Ziqiang Wei (1976): Geology and Prospecting 12(8), 25-29
    Hunan 230 Laboratory, Hunan 305 Geological Team, Wuhan Geological Institution X-ray Laboratory (1976): Acta Geologica Sinica 50(2), 203-204.
      • Xiangtan Prefecture
        • Yuhu District
    Ziqiang Wei (1976): Geology and Prospecting 12(8), 25-29
      • Yiyang Prefecture
        • Heshan District
    Ziqiang Wei (1976): Geology and Prospecting 12(8), 25-29
    • Inner Mongolia Autonomous Region
      • Alxa League (Alashan Prefecture)
        • Ejin Banner (Ejina Co.)
    Dianhao Huang and Baolin Wang (1997): Journal of Precious Metallic Geology 6(2), 93-100
      • Baotou League (Baotou Prefecture)
        • Bayan Obo Mining District
          • Bayan Obo
    Qingchang Meng (1981): Geology and Prospecting 17(3), 10-17
      • Bayan Nur League (Bayannao'er Prefecture)
        • Hanggin Rear Banner (Hangjin Houqi)
    Zhaolong Li, Wendou Xu, Yijie Xi, and Xinming Jiang (1981): Geology and Prospecting 17(6), 7-14
        • Urad Rear Banner (Wulate Houqi)
    Zhaolong Li, Wendou Xu, Yijie Xi, and Xinming Jiang (1981): Geology and Prospecting 17(6), 7-14
      • Hinggan League (Xing'an Prefecture)
        • Tuquan Co.
    Lingan Bai, Jinggui Sun, Qinglong Sun, Alei Gu, Keqiang Zhao, and Lanjing Men (2012): Mineral Deposits 31(6), 1249-1258
      • Hulunbuir League (Hulunbei'er Prefecture)
        • Old Barag Banner (Chenba'erhu Co.)
    Feng Yuan, Degao Zhai, Jiajun Liu, Xiaodong Mao, Jianping Wang, Lidong Liu, Huailing Ma, Shouguang Wang, and Yuxi Li (2012): Geological Bulletin of China 31(6), 954-968
      • Ulaan Chab League (Wulanchabu Prefecture)
        • Siziwang Banner (Siziwang Co.)
    Fengjun Nie, Dongqin Xu, Sihong Jiang, and Yan Liu (2008): Mineral Deposits 27(1), 1-13
      • Ulanhad League (Chifeng Prefecture)
        • Bairin Left Banner (Balin Zuoqi)
    Tai Zhang and Yunji Liu (2002): Geology of Chemical Minerals 24(1), 39-47
    • Jiangsu Province
      • Huai'an Prefecture
        • Xuyi Co.
    Tianhu Chen, Xiaochun Xu, Shucang Yue, and Jinzhong Li (2002): Geology and Prospecting 38(2), 49-54; Tianhu Chen, Huifang Xu, Anhuai Lu, Shuchuan Peng, and Shucang Yue (2004): Science in China, Series D (Earth Sciences), 47(11), 985-1004
    Wenguang Li (1997): Jilin Geology 16(4), 22-25; Ruishi Yang and Wenguang Li (2001): Geology of Chemical Minerals 23(1), 25-30
      • Suzhou Prefecture
        • Huqiu District
    Kecong Han and Shengyun Ma (1985): Mineral Deposits 4(2), 58-68
    • Jiangxi Province
      • Ganzhou Prefecture
        • Ruijin Co.
    Yunhuai Lin (1986): Geology and Prospecting 22(4), 22-28
      • Jiujiang Prefecture
        • Xiushui Co.
          • Xiushui Uranium ore field
    Dahlkamp, F.J., Ed. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156
    Dahlkamp, F.J., Ed. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156
    • Jilin Province (Manchuria; Dongbei Region)
      • Baishan Prefecture
        • Fusong Co.
    [var: Diatomite] Jie Yao, Honglin Yu, Anping Wang, and Yixing He (2002): Journal of Jilin University (Earth Science Edition) 32(1), 43-50
        • Jiangyuan District (Hunjiang Co.)
    Shiyuan Wang, Jizhang Fan, Yajian Liu, and Shan Xu (2007): Geological Bulletin of China 26(7), 909-915
      • Jilin Prefecture
        • Huadian Co.
          • Jiapigou ore field
    Bin Kang, Jirong Bo, and Diguang Dong (2000): Geology and Prospecting 36(6), 27-31
      • Yanbian Chaoxianzu Autonomous Prefecture
        • Wangqing Co.
    Hai Zhao, Xuewu Chui, and Lunxian Xun (2008): Gold Science and Technology 16(1), 48-51
        • Yanji Co.
    Renyi Chen and Zhongyao Rui (1993): Mineral Deposits 12(1)
    • Shandong Province
      • Linyi Prefecture
        • Pingyi Co.
          • Tongshi complex
    Changfu Chen, Yanbing Li, and Mingxia Jiang (1999): Geological Science and Technology Information 18(1), 60-66
    • Shanxi Province
      • Shuozhou Prefecture
        • Pinglu District
    Yongtao Zhang and Guiqin Tang (1986): Mineral Deposits 5(1), 63-72
    • Sichuan Province
      • Ngawa Autonomous Prefecture (Aba Autonomous Prefecture)
        • Zoigê Co. (Ruo'ergai Co.)
    [var: Geyserite] Su Sun (1993): Gold Science and Technology 1(2), 4-10
    http://www.cicresources.com/PDF_REPORTS/Pingding_F1ReportFinal.pdf
    Rocks&Min. 22:625.
      • Nagchu Prefecture (Naqu Prefecture)
        • Amdo Co. (Anduo Co.)
    Shenghao Yan, Jinjie Yu, Yixin Zhao, Zhizhong Xu, Anjian Wang, and Dengkui Su (2003): Mineral Deposits 22(2), 149-157; Jianjun Bu and Qifa Duan (2006): Geological Bulletin of China 25(1/2), 273-276
      • Xigazê Prefecture (Rikaze Prefecture; Shigatse Prefecture)
        • Ngamring Co. (Angren Co.)
    [var: Geyserite] Yuanyi Zhao, Fengjun Nie, Zengqian Hou, Zhenqing Li, Xitao Zhao, and Zhibang Ma (2006): Mineral Deposits [Kuangchuang Dizhi] 25(3), 281-291
        • Xaitongmoin Co. (Xietongmen Co.)
    Xinghai Lang, Juxing Tang, Zhijun Li, Yong Huang, Yuan Chen, and Li Zhang (2011): Mineral Deposits 30(2), 327-338
    • Xinjiang Autonomous Region
      • Tulufan Prefecture (Turfan Prefecture; Turpan Prefecture)
        • Shanshan Co. (Piqan Co.; Pichan Co.)
    Lianchang Zhang, Wenjiao Xiao, Kezhang Qin, Jinsheng Ji, and Xingke Yang (2004): International Journal of Earth Sciences 93, 224-240.
      • Wulumuqi Prefecture (Ürümqi Prefecture; Ürümchi Prefecture)
        • Wulumuqi Co. (Ürümqi Co.; Ürümchi Co.)
          • Chaiwobao Cu ore field
    Jincao Wang, Jianye Wang, Zhengrun Wang, and Ensheng Peng (2000): Geology and Prospecting 36(5), 24-26
      • Yili Hasake Autonomous Prefecture (Ili Kazakh Autonomous Prefecture)
        • Aletai Prefecture (Altay Prefecture)
          • Jimunay Co. (Jeminay Co.; Jeminey Co.)
            • Eastern Sawur Caldera Complex
    Fuquan Yang, Jingwen Mao, Bierlein, F.P., Pirajno, F., Caisheng Zhao, Huishou Ye, and Feng Liu (2009): Ore Geology Reviews 35, 217-234.
        • Xinyuan Co. (Künes Co.)
          • Tu'ergen
    [var: Opal-AN] Wuhan Huaze Science & Technology Development Co. Ltd., 2007
    • Yunnan Province
      • Baoshan Prefecture
        • Tengchong Co.
    Dahlkamp, F.J., Ed. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156
    [var: Diatomite] Dahlkamp, F.J., Ed. (2009): Uranium Deposits of the World. Springer (Berlin, Heidelberg), pp. 31-156
          • Rehai geothermal field
    Pin'an Wang (2001): Bulletin of the Geological Survey of Japan 52(8).
          • Tengchong Sn belt
    Shilu Zhang (1986): Mineral Deposits 5(3), 19-26
      • Chuxiong Autonomous Prefecture
        • Chuxiong Co.
    Yunman Zhou, Jingwen Mao, and Changqing Zhang (2009): Geology and Exploration 45(5), 588-594; Yunman Zhou, Changqing Zhang, Shuqiong Wang, and Xiuping Qin (2012): Mineral Deposits 31(1), 52-64
      • Dehong Autonomous Prefecture
        • Lianghe Co.
          • Tengchong Sn belt
    Shilu Zhang (1986): Mineral Deposits 5(3), 19-26
        • Luxi Co.
    http://www.spartonres.ca/download/Luxi-Sedar(02-02).pdf
      • Pu'er Prefecture
        • Mojiang Co.
    Guangjun Yu and Ruyong Xie (1986): Geology and Prospecting 22(2), 11-18; Yuan Li (1998): Geology and Prospecting 34(5), 28-32
      • Qujing Prefecture
        • Huize Co.
          • Huize Zn-Pb-(Ag) ore field
    Senning Tang (1984): Geology and Prospecting 24(12), 1-9
    • Zhejiang Province
      • Jinhua Prefecture
        • Wuyi Co.
    Panov, B.S., and Hongquan Yan (1989): Geology and Prospecting 25(10), 1-5
    Colombia
     
    • Boyacá Department
      • Guavió-Guatéque Mining District
        • Mun. de Chivor
    [var: Opal-AN] Emeralds of the World English extraLapis Vol. 2 2002 pp36-45
    [var: Milk Opal] Daniel S Yunis
    Costa Rica
     
    • Guanacaste Province
    [var: Diatomite] www.mineralmundi.com
    [var: Diatomite] www.mineralmundi.com
    Cuba
    [var: Moss Opal] Mineral Collector 10:118 (1903)
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Central Bohemia Region
        • Benešov (Beneschau)
    Kratochvíl, F.: Příspěvek k petrografii českého krystalinika. In Sborník geologického ústavu Československé republiky, 1947, sv. 14, s. 449-536.
    Zacek, V., Oplustil, S., Mayova, A. & Meyer, F. R. (1995): Die Mineralien von Kladno in Mittelböhmen, Tschechische Republik. Mineralien-Welt 6 (1), 13-30 (in German).
    Pauliš, P.: Nejzajímavější mineralogická naleziště Čech. Kutná Hora: Kuttna, 2000, s. 84-85.
        • Vlašim (Wlaschim)
    Zemek, V.: Zlatodůl Roudný u Vlašimi. Pod Blaníkem, 5. samostatná příloha, 2001: Podblanické ekocentrum Českého svazu ochránců přírody a Muzeum okresu Benešov, 108 s.
      • Hradec Králové Region
        • Nová Paka (Neupaka)
    http://www.mineralos.cz/lokality/hridele/uhride.htm
      • Karlovy Vary Region
        • Doupov (Duppau)
    [var: Opal-AN] No reference listed
        • Horní Slavkov (Schlaggenwald)
          • Krásno (Schönfeld)
            • Čistá
    Janečka, J., Just, J., Kušnír, I.: Zpráva o výzkumu a výpočet zásob Sn-rud na ložisku Jeroným v Čisté ve Slavkovském lese (stav ke dni 1.7.1966). Loket: MS, Ústřední ústav geologický Praha, 1966. 86 s.
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov District (St Joachimsthal)
            • Horní Blatná District (Platten)
              • Horní Blatná (Platten; Bergstadt Platten)
    Bufka, A., Velebil, D.: Manganová mineralizace žíly Marie Terezie u Horní Blatné v Krušných horách. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2003, roč. 11, s. 100-114.
    Lapis 2002(7/8), 63-65
        • Sokolov (Falkenau an der Eger)
    Pauliš P. Nejzajímavější mineralogická naleziště Čech II. Kuttna. Kutná Hora 2003. ISBN 80-86406-27-X.
      • Liberec Region
        • Harrachov (Harrachsdorf)
    Fengl, M.: Mineralogie těžených fluoritových ložisek (1.-5.). Minerál, 1998-1999, roč. 6-7, č. 2, 4, 6, 1, 3.
        • Kozákov (Kosakow)
    Pauliš, P.: Nejzajímavější mineralogická naleziště Čech. Kutná Hora: Kuttna, 2000, s. 57-58.
    Scharm, B.: Přehled minerálů nalezených v oblasti uranových koncentrací v severočeské křídě. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 169-172.
      • Pardubice Region
    Prachař, I.: Současný stav výskytu nerostů ve Chvaleticích. Acta musei Reginaehradecensis, série A: vědy přírodní, 1981, roč. XVI., s. 99-102.
    Pauliš P. Mineralogické lokality okolí Kutné Hory. Kuttna, Kutná Hora 1999. ISBN 80-9027 19-0-1.
      • Plzeň Region
        • Černošín (Tschernoschin)
    Navrátil, Z., Šrein, V.: Krystalovaný olivín v tufech Vlčí hory u Černošína. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1997, roč. 4-5, s. 177-178.
        • Klatovy (Klattau)
          • Horažďovice
            • Hejná
    Hofmanovi P. a R.: Mineralizace vápencového lomu na vrcholu Radvanka u Hejné. Minerál, 2010, 18, 3, 201-211.
        • Rokycany (Rokitzan; Rokytzan)
    Janouš, F.: Minerály z Kněží hory u Těškova (okres Rokycany), Minerál, 1995, roč. 3, č. 6, s. 367-369.
    Pauliš, P.: Nejzajímavější mineralogická naleziště Čech II. Kutná Hora: Kuttna, 2003, s. 111-114.
      • South Bohemia Region
        • České Budějovice (Budweis)
    No reference listed
    Duda, Rejl, Slivka: "Mineralien", 1991; Čech, V., Koutek, J.: Geologické a genetické poměry ložisek železné a niklové rudy u Křemže v jižních Čechách. Sborník St. geol. úst. ČSR, 1946, sv. 13,
        • Písek
    [var: Opal-AN] Cícha J., Sejkora J.: Vanadový wavellit, variscit a další fosfáty z grafitických kvarcitů v Čížové u Písku. Minerál, 2011, 19, 1, 23-32.
        • Strakonice
    Litochleb, J. et al.: Korund ze skapolitem bohaté vápenatosilikátové horniny v moldanubických mramorech u Krtů na Strakonicku. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1997, roč. 4-5, s. 169-172.
        • Tábor
    http://www.mineralos.cz/lokality/chynov/chynov.htm
      • Ústí Region
        • Bílina (Bilin)
    Bouška, V., Dvořák, Z.: Nerosty severočeské hěndouhelné pánve. Praha: Severočeské doly, a.s., 160 s.
          • Hořenec (Horzenz)
    Filippi, M., Filippi, R.: Hořenec u Bíliny – světová lokalita krystalů aragonitu. Minerál, 2004, roč. 12, č. 3, s. 188-195.
    Velebil, D.: Bílina – Hradiště, klasické naleziště „cimolitu“ a „anauxitu“. Minerál, 2005, roč. 13, č. 6, s. 413-419.
        • Chomutov (Komotau)
    Řehoř, M., Dvořák, Z.: Nové poznatky o mineralogii lokality Ahníkov. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1997, roč. 4-5, s. 183-185.
        • Děčín (Tetschen)
          • Jílové u Děčína (Ober Eulau)
    Fengl, M.: Mineralogie těžených fluoritových ložisek (4.). Minerál, 1999, roč. 7, č. 1, s. 38-53.
        • Duchcov (Dux)
    Bouška, V., Dvořák, Z.: Nerosty severočeské hěndouhelné pánve. Praha: Severočeské doly, a.s., 160 s.
        • Kadaň (Kaaden)
          • Tušimice
    Bouška, V., Dvořák, Z.: Nerosty severočeské hěndouhelné pánve. Praha: Severočeské doly, a.s., 160 s.
        • Krušné Hory Mts (Erzgebirge)
          • Klášterec nad Ohří
    Wiesner, T.: Nová lokalita minerálů zeolitové skupiny u Klášterce nad Ohří. Časopis pro mineralogii a geologii, 1984, roč. 29, č. 4, s. 432.
          • Krupka (Graupen)
    Analysed by geology lab Green Gas DPB
        • Most
          • Braňany
    Svejkovský J., Dvořák Z.., Řehoř M., Muzikant P.: Zajímavá mineralizace bentonitového lomu v Braňanech u Mostu. Minerál, 2013, 21, 6, 541-547.
    Filippi, M.: Korozluky – pozoruhodná mineralogická lokalita Českého středohoří. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2002, roč. 10, s. 320-322.
        • Ústí nad Labem (Aussig)
    Ulrych, J. et al. (2000): Tertiary phonolite laccolith of Mariánská hora hill, N. Bohemia: geological, petrological and mineralogical characteristics. Acta Montana IRSM AS CR, series A No. 15 (116), p. 5-44.
    [var: Opal-AN]
    [var: Opal-AN] www.geocities.com/Smula.geo
          • Řehlovice
            • Radejčín (Radzein)
    [var: Opal-AN] Radoň M. Významné mineralogické lokality Českého středohoří. Minerál 2009, XVII(2):106-126.
    [var: Opal-AN]
    • Moravia (Mähren; Maehren)
      • Olomouc Region
        • Žulová (Friedeberg)
    Kruťa, T.: Nerostný výzkum ve Slezsku v letech 1956-1957. Přírodovědecký sborník Ostravského kraje, 1957, 18, 543-571.
      • South Moravia Region
        • Blansko
    Dana RICHTEROVÁ, Antonín PŘICHYSTAL and Zdeněk LOSOS, "Moravian Jurassic Geodes and their Geological Significance," GeoLines 13, 2001, p. 106. (http://geolines.gli.cas.cz/fileadmin/volumes/volume13/G13-106.pdf)
        • Brno (Brünn)
    Mrázek, I.: Nová nelaziště achátu a opálu u Brna-Černovic. Časopis pro mineralogii a geologii, 1976, roč. 21, č. 1, s. 96.
        • Letovice (Lettowitz)
    Ulrych, J.: Stichtit z hadcového tělesa od Slatinky u Letovic. Časopis pro mineralogii a geologii, 1966, roč. 11, č. 3, s. 311-315.
        • Moravský Krumlov
    Slavíček, P, Beneš, M.: Zajímavý výskyt opálů v Dukovanech na Třebíčsku. Časopis pro mineralogii a geologii, 1985, roč. 30, č. 3, s. 333.
        • Oslavany
          • Hrubšice
    Jirásek, J.: Nový nález huntitu u Hrubšic na západní Moravě a otázka jeho vzniku. Acta Musei Moraviae, Sci. geol., 2007, roč. 92, s. 103-109.
          • Mohelno
    Němec, F., 1937: Mineralogie, petrografie a geologie okolí Mohelna. Monografie hadce (monografie hadce). – In: Archiv Svazu pro ochranu přírody a domoviny v zemi Moravskslezské, Brno, 49-112.
        • Tišnov
    Uwe Kolitsch (visual ID)
      • Vysočina Region
        • Bystřice nad Pernštejnem
    Kopa, D.: Mineralogie a petrografie hadce od Věchnova. Časopis Slezského musea, series A: vědy přírodní, 1960, roč. 9, s. 17-24.
    Houzar, S., Pošmourný, K.: Ag-Pb-Zn rudní mineralizace u Jemnice na jihozápadní Moravě. Acta Musei Moraviae, Scientiae naturales, 1991, roč. 76, s. 95 - 103.
        • Křižanov
    Paulis P. (2001): Nejzajimavejsi mineralogicka naleziste Moravy a Slezska. Kuttna, Kutna Hora.
    Houzar, S., Novák, M., Doležalová, H., Hrazdil, V., Pfeiferová, A.: Přehled mineralogie, petrografie a geologie nedvědických mramorů, svratecké krystalinikum. Acta Musei Moraviae, Sci. geol., 2006, roč. 91, s. 3-77.
    Petr Pauliš: Nejzajímavější mineralogická naleziště Moravy a Slezska II.(2005)
        • Štěpánov nad Svratkou
    Velebil, D., Kráčmar, L.: Ložisko Borovec u Štěpánova (štěpánovský revír). Minerál, 2002, roč. 10, č. 3, s. 163-181.
        • Velké Meziříčí
    Novák, M., Staněk, J.: Lepidolitový pegmatit od Dobré Vody u Velkého Meziříčí, západní Morava. Acta Musei Moraviae, Scientiae geologicae, 1999, roč. 84, s. 3 - 44.
        • Žďár nad Sázavou
    Staněk, J.: Parageneze minerálů pegmatitových žil z Hatí u Dolních Borů na západní Moravě. Acta Mus. Moraviae, Sci. nat., vol. 76, pages 19-49.
    Novák, M., Houzar, S., Pfeiferová, A.: Přehled mineralogie, petrografie a historie klasické lokality lepidolitového pegmatitu v Rožné u Bystřice nad Pernštejnem, západní Morava. Acta Musei Moraviae, Sci. geol., 83:3-48.
    Petr Pauliš (2001): Nejzajímavější mineralogická naleziště Moravy a Slezska. Kuttna, Kutná Hora.
          • Věžná
    Canadian Mineralogist, Vol 17, 1979, pp. 583-588.
    http://pruvodce.geol.morava.sci.muni.cz/Vezna_hadec/Vezna_hadec_text.htm; Petr Pauliš (2001): Nejzajímavější mineralogická naleziště Moravy a Slezska. Kuttna, Kutná Hora.
      • Zlín Region
        • Komňa
    Pauliš, P: Nejzajímavější mineralogická naleziště Moravy a Slezska. Kutná Hora: Kuttna, 2001, s. 42-44.
    Democratic Republic of Congo (Zaïre)
     
    • Kasaï (Kasaï-Occidental)
    Edwards, M.G. (1917) The American Mineralogist, 2, #7, 88-89.
    • Katanga (Shaba)
      • Katanga Copper Crescent
        • Shinkolobwe
    MinRec 20:287-288
    Denmark
     
    Claus Hedegaard collection (nos. 613, 7010, 7242 a.o.)
      • Borðoy Island
    Zeolite collection of Volker Betz; SMLS Journal 234 Nov/Dec 2011
      • Streymoy Island
        • Tórshavn
    [var: Opal-CT] Caucia, F., Marinoni, L., Leone, A. (2013): Physical, geochemical and gemological properties of opals from Faroe Islands. Neues Jahrbuch für Mineralogie - Abhandlungen.191, 33-43
    • Midtjylland Region
      • Skive
    Bøggild (1943)
    • Nordjylland Region
      • Morsø
        • Mors Island
          • Ejerslev
    Bøggild (1943); Bøggild (1943)
    Torben Kjeldgård photo & specimen
    Ecuador
    [var: Fire Opal] Rocks&Min 51:11
    • Chimborazo Province
      • Alausi Canton
    [var: Geyserite] http://www.municipiodealausi.gob.ec/UserFiles/File/TIXAN.pdf
    Egypt
     
    • Western Desert
    S. Tosson et al. , Bull. Soc. Fr. Minéral. Cristallogr. , 1974, 97, pp. 27-39.
    Ethiopia
     
    • Afar Province
    Ethiopian Gem Association Ethiopian Gem Association http://tracktech.net/ega/index.php
    Rondeau, B.; Mazzero, F.; Bekele, E.; Gauthier, F. P.; Fritsch, E., 2009, New play-of-color opal from Welo, Ethiopia, Gems & Gemology, 45, (1), 59-60.
        • Delanta
          • Wegeltena (Wegel Tena)
    Jordi Fabre
    • Amhara Province
      • Mezezo
    Gem Information, 23 May 2007 (Japan Germany Gemmological Laboratory), 20-24.
    • Oromia Province (Oromiya Province)
    Alfredo Petrov field observations, 1972.
    • Sidamo-Borana Province
    [var: Opal-AN] (Rock Currier collection)
    Fiji
     
    • Vanua Levu
      • Nukundamu
    Finland
     
    • Southern Finland Region
      • Kotka
    Lahti Seppo I. 2011. Kotkan topaasilouhoksesta ja sen mineraaleista. Kivi-lehti 4.
    • Southwestern Finland Region
      • Salo
    Niskanen, Maria (2014). Salitun felsisten juonten mineraalikoostumus ja evoluutio. Pro Gradu-tutkielma (2014). Geotieteiden ja Maantieteen Laitos Helsingin Yliopisto.gedrite
    • Western and Inner Finland Region
      • Korsnäs
    The world of opals By Allan W. Eckert
    France
     
    • Aquitaine
      • Lot-et-Garonne
    [var: Opal-CT] Econ Geol (1989) 84:1541-1556
    • Auvergne
      • Allier
    M Arliguie collection
      • Cantal
        • Cantal Mts
          • Le Lioran
    Yves Masson specimen
        • Menet
    Vessely Yannick collection
        • Saint-Flour
          • Faverolles
    [var: Opal-AN] Robin Fialip
          • Loubaresse
    [var: Wood Opal] http://www.brgm.fr/volcan/ressourcesmin.htm
      • Haute-Loire
        • Brioude
          • Saint-Beauzire
    P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989
        • Le Puy-en-Velay
          • Ceyssac
    [var: Opal-AN] Collected by Stéphane Jamon
        • Mazeyrat-d'Allier
    [var: Opal-AN] Pierre Le Roch collection
        • Paulhaguet
          • Jax
        • Pradelles
          • Landos
    [var: Opal-AN] Aufschluss 1974(3), 193-197
      • Puy-de-Dôme
        • Besse-et-Saint-Anastaise
    http://gsa.confex.com/gsa/inqu/finalprogram/abstract_54492.htm / The XVI INQUA Congress, Reno, Nevada, USA
        • Champeix
          • Saint-Nectaire
    [var: Forcherite] Alain TUEL collection
        • Clermont-Ferrand
    [var: Opal-CT] Remi Bornet Collection
          • Saulzet-le-Chaud
    "Les minéraux, leurs gisements, leurs associations", P. Bariand, F. Cesbron et J. Geffroy (1977), Editions Minéraux et Fossiles, BRGM
    [var: Opal-AG]
    [var: Opal-CT] Remi Bornet Collection
    [var: Opal-CT] Aimé Rudel : "Curiosités Géologiques d'Auvergne et du Velay", Editions Volcans, 1970
        • Issoire
          • Perrier
    my collection
          • Saint-Babel
    [var: Opal-AN] Barrier, D., Devolle, J.-C., Médard, P, Naud, E. Naud & Pourtier, G. (2009): Si l'amesite m'était Comté... ou pas d'haüyne à Prudeux, Le Cahier des Micromonteurs, 103, 3-8.
        • Lempdes
    [var: Opal-CT] Remi Bornet Collection
    [var: Opal-CT] Remi Bornet Collection
    [var: Opal-CT] Mallard, E., 1890, Bull. Soc. Min., v13, p. 63
    [var: Opal-CT] Remi Bornet Collection
    [var: Opal-CT] Remi Bornet Collection
        • Pontgibaud
          • Saint-Jacques-d'Ambur
          • Saint-Ours-les-Roches
    Mboungou-Kongo J.B. (2002), L'hématite spéculaire du puy de Tunisset, Chaîne des Puys (Puy de Dôme), Le Régne Minéral, n°46, pp: 51-55
        • Puy-Guillaume
          • Lachaux
    J.-J. Périchaud: "Où trouver les minéraux d'Auvergne", Vol. 1, Editions l'Instant Durable (Clermont-Ferrand), 1985, p. 92
    J.-J. Périchaud: "Où trouver les minéraux d'Auvergne", Vol. 1, Editions l'Instant Durable (Clermont-Ferrand), 1985, p. 92
    J. Geffroy, J.A. Sarcia, J. Chervet : "Les Minéraux Uranifères Français", 1960, Institut National des Sciences et Techniques Nucléaires / Saclay - PUF.
    P.-C. Guiollard (2002), L'uranium du Morvan et du Forez, Ed. P.-C. Guiollard, Fichous(64), 95 pp.
    J. Chervet, G. Branche : "Contribution à l'étude des minéraux secondaires d'uranium français", ENSP Nancy, 1955
    Queneau Patrice Collection
          • Philibin
        • Saint-Germain-Lembron
          • Gignat
    G. Artioli et al. , Am. Min. , V84, 1999, pp. 1445-1450.
        • Thiers
          • Saint-Rémy-sur-Durolle
    J. Chervet and G. Branche : "Contribution à l'Etude des Minéraux Secondaires d'Uranium Français", ENSG, Nancy, 1955
        • Veyre-Monton
          • La-Roche-Blanche
    J.-J. Périchaud: "Les Minéraux d'Auvergne", Vol. 1, 1985
    • Brittany
      • Côtes-d'Armor
        • Plounévez-Quintin
          • Trémargat
    Germain C., Guillou A. (1988), Le Cahier des Micromonteurs, n°3, 3-7
      • Morbihan
        • Pontivy
          • Guern
    R. Pierrot, L. Chauris, C. Laforêt and F. Pillard : "Inventaire Minéralogique de la France N° 9 : Morbihan", BRGM, 1980.
    • Centre
      • Cher
        • Bourges
    The Quincyte pigments: fossil quinones in an Eocene clay mineral. W.G. Prowse, K.I. Arnot, J.A. Rechka, R.H. Thomson and J.R. Maxwell. Tetrahedron 47, 1991, 1095-1108. K.I.
    • Ile-de-France
      • Paris
    [var: Menilite]
    • Languedoc-Roussillon
      • Gard
        • Alzon
    [var: Opal-AN] Patrice Queneau Collection
    TREILLARD Michel collection
        • Lodève
    "Giorgio Bortolozzi (visual identification)"
      • Pyrénées-Orientales
    Berbain,C., Riley, T., Favreau, G., (2012): Phosphates des pegmatites du massif des Albères (Pyrénées-Orientales). Le Cahier des Micromonteurs. 117, 121-172
          • Collioure (Cotlliure)
    BERBAIN. C, RILEY. T, FAVREAU. G, (2012) Phosphates des pegmatites du massif des Albères. Ed Association Française de Microminéralogie
        • Mosset
    [var: Opal-AN] Remy, P., Gatel, P., Meisser, N. (2014): Indice à terres rares de Mosset (Pyrénées-Orientales). Le Cahier des Micromonteurs, 1-2014, 3-17.
    • Limousin
      • Corrèze
        • Meymac
    [var: Opal-AN] Ansermet, S., Cuchet, S. & Meisser, N. (2010): Minéralogie de la mine de La grange, Meymac, Corrèze. Le Règne Minéral, 91: 23-31
      • Haute-Vienne
        • Razès
    J. Geffroy, J.A. Sarcia, J. Chervet : "Les Minéraux Uranifères Français", 1960, Institut National des Sciences et Techniques Nucléaires / Saclay - PUF.
    • Lower Normandy
      • Manche
    Yale Peabody Museum
    • Midi-Pyrénées
      • Aveyron
        • Decazeville
          • Firmi
      • Haute-Garonne
        • Moncaup
    Inventaire Minéralogique de la France numéro 8 Haute Garonne 31 Editions du BRGM 1978 page 115
      • Tarn
        • Castelnau-de-Brassac
          • Fumade
    Jean-Marie LAURENT's collection
    • Poitou-Charentes
      • Deux-Sèvres
        • Le Temple
    Le Cahier des micromonteurs, 2002, N°75, pp 8-25
    • Provence-Alpes-Côte d'Azur
      • Alpes-Maritimes
    Fröhlich F., Mari G., Mari D. (2001), Les silicifications hydrothermales à opale de Biot (Alpes-Maritimes), Le Règne Minéral, n°40, pp: 5-12
        • Saint-Etienne-de-Tinée
    Chollet Pascal Collection
      • Var
        • Agay
    [var: Opal-AN] self collected by S. MAURY
        • Les Adrets
    [var: Opal-AN] Stéphane Maury collection
      • Vaucluse
        • Apt
    F. Roulin et al. , 1986, 109, pp. 349-357.
    • Rhône-Alpes
      • Ardèche
        • Privas
    Yves Masson specimens
          • Saint-Priest
    Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, pp. 450-464.
      • Loire
        • Saint-Etienne
          • Saint-Priest-en-Jarez
    G. Demarcq, 1973, "Guides Géologiques Régionaux : Lyonnais, Vallée du Rhône" , p. 88, Masson.
        • Saint-Georges-en-Couzan
          • Châtelneuf
    [var: Opal-AN] Anthony Geneyton Collection
        • Saint-Haon-le-Châtel
          • Ambierle
    BRGM (1981) - Fiche BSS 06478X4001/GT
      • Rhône
        • Le Bois d'Oingt
          • Chessy-les-Mines
    [Le Cahier des Micromonteurs 1988, 4, p.6-46]
    French West Indies
     
    • Guadeloupe
      • Basse-Terre
    Olivier Mével spécimen
    Georgia
     
    • Adjaria Autonomous Republic
    [var: Wood Opal] Alexander G. Tvalchrelidze, Georges Morizot (2003) Mineral Resource Base of the Southern Caucasus and Systems for its Management in the XXIst Century. Springer 204pp
    • Kvemo Kartli Region
      • Bolnisi District
    Ramaz Migineishvili (2005) Hybrid nature of the Madneuli Cu-Au deposit, Georgia. IGCP Project 486, 2005 Field Workshop, Kiten, Bulgaria, 14-19 September 2005
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Badenweiler
          • Schweighof
    [var: Opal-AN] S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Haslach
          • Schnellingen
    [var: Opal-AN] Wittern: "Mineralfundorte in Deutschland", 2001; Schmeltzer, H. (1993): Die Grube Segen Gottes bei Schnellingen - ein polymetallisches Mineralvorkommen. Der Erzgräber, 7 (2), 34-35.
        • Hornberg
    [var: Opal-AN] Lapis 23(12), 45 (1998)
        • Kandern
    [var: Opal-AN] Brill, A. R. (2011): Die Malsburger Granitsteinbrüche bei Kandern im südwestlichen Schwarzwald. Lapis 36 (7-8), 43-51; 70.
        • Menzenschwand
          • Vorderdorf
    [var: Opal-AN] S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Schapbach
          • Wildschapbach valley
    [var: Opal-AN] K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
        • Schauinsland Pb-Zn mining district
          • North field
    [var: Opal-AN] S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Schönau
    [var: Opal-AN] K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
        • Titisee-Neustadt
    [var: Opal-AN] K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
        • Todtnau
    [var: Opal-AN] http://www.mineralienatlas.de/lexikon/index.php/Deutschland/Baden-W%FCrttemberg/Schwarzwald/Todtnau/Lisb%FChl
        • Waldshut
          • Detzeln
    [var: Opal-AN] Hess, E., Graeser, S. & Gabriel, W. (2011): Das Porphyrwerk Detzeln im Steinatal und seine Mineralien. Lapis 36 (4), 25-35; 54.
        • Wolfach
          • Oberwolfach
            • Rankach valley
    [var: Opal-AN] Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
      • Hegau
        • Singen
    Lapis 1978(1), 19
      • Kaiserstuhl
        • Bötzingen
    [var: Opal-AN] Fricke, G., (1988): Der Kaiserstuhl und seine Minerale, Der Aufschluss, Vol. 39(2), 74-76
        • Burkheim-Sponeck
    [var: Opal-AN] No reference listed
        • Ihringen
    [var: Opal-AN] Aufschluss 1988(2), 76
        • Oberbergen
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Oberrotweil
    [var: Opal-AN] Fricke, G., (1988): Der Kaiserstuhl und seine Minerale, Der Aufschluss, Vol. 39(2), 74-76
        • Sasbach
    [var: Opal-AN] Bega photo
    [var: Opal-AN] No reference listed
      • Odenwald
        • Schriesheim
          • Ursenbach
    [var: Opal-AN] S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Bavaria
      • Franconia
        • Fichtelgebirge
          • Kemnath
    [var: Opal-AN] Weiss: "Mineralfundstellen, Deutschland West", 1990
          • Weißenstadt
            • Großer Waldstein
    Wittern: "Mineralfundorte in Deutschland", 2001
            • Kirchenlamitz
    [var: Opal-AN] Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
          • Wunsiedel
            • Schönbrunn
    [var: Wax Opal] F. Müller: "Bayerns steinreiche Ecke", 2nd. ed. (1984), pp. 59-62
        • Franconian Forest
          • Hof
            • Joditz
    [var: Opal-AN] F. Müller: "Bayerns steinreiche Ecke", 2nd ed., Oberfränkische Verlagsanstalt und Druckerei GmbH (Hof), 1984
        • Maroldsweisach
    [var: Opal-AN] Wittern: "Mineralfundorte in Deutschland", 2001
        • Münchberg Metamorphic complex
          • Oberkotzau
            • Wurlitz
    [var: Opal-AN] Rost, F. (1949): Contributions to Mineralogy and Petrology 1(5/6), 627-688.
        • Spessart
          • Hösbach
            • Sailauf
              • Hartkoppe
    see locality page
      • Lower Bavaria
        • Bavarian Forest
          • Hauzenberg
            • Kropfmühl-Untergriesbach Graphite Mining District
              • Untergriesbach
    [var: Opal-AN] S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
            • Kropfmühl
    [var: Opal-AN] Mineralien-Welt 18 (5) (2007) 20-26.
            • Obernzell
              • Steinhag
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
          • Waldkirchen
            • Röhrnbach
    [var: Opal-AN] Habel, M. (2009): Der Granodioritbruch der Fa. Josef Uhrmann OHG, Steinerleinbach bei Röhrnbach. Mineralien-Welt 20 (2), 66-86.
          • Zwiesel
            • Bodenmais
    Obermüller, T., (1993): Der Silberberg bei Bodenmais/Bayer. Wald, Der Aufschluss, Vol. 44, 201-224
        • Vilshofen
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Upper Palatinate
        • Nittenau
          • Roßbach
    [var: Opal-AN] S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Oberpfälzer Wald
          • Flossenbürg
    [var: Opal-AN] Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Hesse
      • Gießen (Giessen)
        • Großen-Buseck
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Hausen
    [var: Opal-AN] S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Rabenau
          • Londorf
    [var: Opal-AN] S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Main valley
        • Dietesheim - Steinheim
    [var: Opal-AN] S. Weiss: Mineralfundstellen, Deutschland West, Weise (Munich), 1990
        • Hanau
    [var: Opal-AN] S. Weiss: Mineralfundstellen Deutschland West, Weise (Munich), 1990
      • Neuberg
    [var: Opal-AN] Bischof, C. (1874): Polytechnisches Journal 174, 140-146.
      • Odenwald
        • Bensheim
          • Hochstädten
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Fürth
    S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Gorxheimertal
          • Gorxheim
    S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Lautertal (Odenwald)
          • Raidelbach
            • Katzenstein
    Collection of Steffen Michalski, ex-collection and collected by Klaus PETITJEAN
          • Reichenbach
            • Borstein
    Collection of Steffen Michalski, ex-collection and collected by Klaus PETITJEAN
            • Hohenstein
    [var: Opal-AN] No reference listed
        • Otzberg
    Nickel, E., and Fettel, M. (1985): Odenwald. Sammlung geologischer Führer Vol. 65, 2nd ed., Bornträger (Berlin, Stuttgart), 231 pp.
        • Roßdorf
    [var: Opal-AN] S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Vogelsberg
        • Herbstein
    [var: Opal-AN]
        • Homberg
          • Nieder-Ofleiden
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Hungen
          • Langd
    [var: Opal-AN]
          • Oberwiddersheim
    [var: Opal-AN]
        • Reichelsheim
          • Bingenheim
    [var: Opal-AN] S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
          • Blofeld
    [var: Opal-AN] S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Schotten
          • Gonterskirchen
    S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Wetzlar
        • Rodheim-Bieber
    Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Lower Saxony
      • Göttingen
        • Adelebsen
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Harz
        • Clausthal-Zellerfeld
          • Bockswies veins
            • Oberschulenberg
    Lapis, 11 (1), 9-18+42
        • Goslar
    Dietrichs, J. (2006): Die Mineralien der Nickelgrube "Großfürstin Alexandra" im Ostharz. Lapis 31 (6), 28-30; 70.
        • St Andreasberg District
    No reference listed
    • North Rhine-Westphalia
      • Siebengebirge
        • Bonn
          • Bad Godesberg
    [var: Opal-AN] Brauns, R. (1922): Die Mineralien der Niederrheinischen Vulkangebiete, Schweitzerbart Stuttgart
    Brauns, R., (1922): Die Mineralien der Niederrheinischen Vulkangebiete, Schweizerbart, Stuttgart
          • Oberkassel (Obercassel)
    Dechen, H. von (1852): Geognostische Beschreibung des Siebengebirges am Rhein, Cohen Bonn
        • Königswinter
    Andreas Gerstenberg collection
    Brauns, R., (1922): Die Mineralien der Niederrheinischen Vulkangebiete, Schweizerbart, Stuttgart
    Brauns, R., (1922): Die Mineralien der Niederrheinischen Vulkangebiete, Schweizerbart, Stuttgart
      • Siegerland
        • Neunkirchen
          • Hohenseelbachskopf
    [var: Wood Opal] Haege, T. (1887): Die Mineralien des Siegerlandes und der angrenzenden Gebiete. 50 pp.
          • Salchendorf
    [var: Opal-AN] Klein, E. (1999): Ein Basanit-Vorkommen nordwestlich von Salchendorf bei Neunkirchen / Siegerland. Der Aufschluss, 50, 203-206.
    • Rhineland-Palatinate
      • Eifel
        • Daun
          • Hinterweiler
    Blass, G., Graf , HW., Neue Mineralienfunde aus der Vulkaneifel, MW 1/2001
          • Oberstadtfeld
    [var: Opal-AN] Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München (2. Auflage), 1987
        • Hillesheim
    [var: Opal-AN] Blaß, G. & Kruijen, F. (2013): Die Mineralogischen Neuigkeiten aus der Vulkaneifel. Mineralien-Welt 24 (3), 33-41.
    [var: Opal-AN] Hentschel, G.(1987): Die Mineralien der Eifelvulkane, Weise Verlag München, 2. Auflage
          • Walsdorf
    [var: Opal-AN] Hentschel, G.(1987): Die Mineralien der Eifelvulkane, Weise Verlag München, 2. Auflage
          • Zilsdorf
    [var: Opal-AN] Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag München (2. Auflage), 1987
        • Laach lake volcanic complex
          • Kruft
    Hentschel, G., Die Minerale in Auswürflingen des Laacher -See –Vulkans, Der Aufschluss, SB 33, 65-105, 1990
          • Mendig
            • Niedermendig
    Hentschel, G., Die Minerale in Auswürflingen des Laacher -See –Vulkans, Der Aufschluss, SB 33, 65-105, 1990
    Hentschel, G., Die Minerale in Auswürflingen des Laacher -See –Vulkans, Der Aufschluss, SB 33, 65-105, 1990
              • Wingertsberg
    Hentschel, G., Die Minerale in Auswürflingen des Laacher -See –Vulkans, Der Aufschluss, SB 33, 65-105, 1990
        • Mayen
          • Ettringen
            • Bellerberg volcano
    [var: Opal-AN] Blass, G., Graf, H.W., Neufunde von bekannten Fundorten (VI), Mineralien-Welt 3/6,32-35, 1992
        • Mendig
          • Bell
    Hentschel, G., Die Mineralien der Eifelvulkane, Weise Verlag, München (2. Auflage), 1987
      • Lahn valley
        • Laurenburg
    [var: Opal-AN] S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Palatinate
        • Winnweiler
          • Imsbach
    Lapis, 9 (5), 36-39.
    Lapis, 9 (5), 36-39.
    Wittern: "Mineralfundorte in Deutschland", 2001
    Wittern: "Mineralfundorte in Deutschland", 2001
        • Wolfstein
          • Königsberg
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Westerwald
        • Linz am Rhein
          • Rheinbreitbach
    Weiss: "Mineralienfundstellen, Deutschland West", Weise (Munich), 1990
    • Saarland
      • Nonnweiler
        • Kastel
    Thomas Kleser & Erwin Ecker Collections
    • Saxony-Anhalt
      • Halle
        • Petersberg
    Wittern: "Mineralfundorte in Deutschland", 2001
    Wittern: "Mineralfundorte in Deutschland", 2001
      • Harz
        • Gernrode
          • Hagental
    Thomas Lühr collection
        • Harzgerode mining district
          • Güntersberge
    Thomas Lühr
        • Wernigerode
          • Hasserode
    Wittern: "Mineralfundorte in Deutschland", 2001
    • Saxony
      • Chemnitz
        • Hartmannsdorf
    Vollstädt, H. (1979): Einheimische Minerale, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig, p. 289.
        • Markersdorf
    Wittern: "Mineralfundorte in Deutschland", 2001
      • Döbeln
    [Precious Opal] H. Vollstädt, R. Baumgärtel: "Einheimische Edelsteine", 2nd. ed., Steinkopff (Dresden), 1977
      • Erzgebirge
        • Altenberg
    Mineralien-Welt, (2), 17-39.
    Lapis 17(12), 24-33
        • Breitenbrunn District
          • Antonsthal
    Gröbner J., Kolitsch U.; Neufunde aus dem Erzgebirge (II), Mineralien-Welt Jg 17 (2006), 3, pag. 22-27.
        • Ehrenfriedersdorf
    Wittern: "Mineralfundorte in Deutschland", 2001
    [var: Alumocalcite] Frenzel, A. (1874): Mineralogisches Lexicon fpr das Königreich Sachsen, Leipzig.
          • Blauenthal
    [var: Milk Opal] Tröger, S. (2009): Der Steinbruch Fahsel im Eibenstocker Granit, Westerzgebirge. Lapis 34 (6), 49-52.
          • Sosa
            • Auersberg
    [var: Mother of Pearl Opal] Lapis 33 (10), 38-40.
    Lapis 11(7/8), 13-60 (1986)
          • Brand-Erbisdorf
    August Frenzel (1874): Mineralogisches Lexicon fpr das Königreich Sachsen, Leipzig.
        • Johanngeorgenstadt District
    Frenzel, A. (1874): Mineralogisches Lexicon für das Königreich Sachsen, Leipzig.
          • Steinbach
    Wittern: "Mineralfundorte in Deutschland", 2001
        • Niederschlag-Bärenstein District
          • Bärenstein
            • Niederschlag
    Lapis, 19 (4), 13-22+50.
        • Schneeberg District
          • Neustädtel
    Lapis 30(7/8):77 (2005)
        • Schwarzenberg District
          • Pöhla
    Wittern: "Mineralfundorte in Deutschland", 2001
    Andreas Gerstenberg collection
      • Oberlausitz
        • Görlitz
    [var: Opal-AN] www.minmax.net
          • Neißeaue
    Witzke, T. & Giesler, T. (2013): Seltene Phosphate und Vanadate von Emmerichswalde bei Görlitz/Sachsen. Mineralien-Welt 24 (2), 40-55
          • Rengersdorf
    [var: Opal-AN] T. Witzke & T. Giesler (1993): Dufrenit und Opal von Rengersdorf/Lausitz.- Mineralien-Welt 4 (5), 14
        • Kamenz
    Wittern: "Mineralfundorte in Deutschland", 2001
    Wittern: "Mineralfundorte in Deutschland", 2001
      • Vogtland
        • Lengenfeld
          • Pechtelsgrün
    Lapis, 17 (7/8), 26-33+90
        • Oelsnitz
    [var: Opal-AN] Gröbner, J. and Kolitsch, U. (2007): The minerals of the uranium prospect at Tirpersdorf, Vogtland. Lapis 32, 37-42; 58. (in German)
    • Schleswig-Holstein
      • Kiel
        • Preetz
    [var: Wood Opal] A. Wittern: "Mineralfundorte in Deutschland", Schweizerbart (Stuttgart), 2001
    • Thuringia
      • Gera
        • Weida
    Richter, E. & Rüger, F. (2010): Der Diabas-Tagebau Loitsch in Thüringen und seine Mineralien. Lapis 35 (2), 13-22; 54.
      • Wurzbach
        • Weitisberga
    Wittern: "Mineralfundorte in Deutschland", 2001
    Germany & Czech Republic
     
    • Saxony & Ústí Region (Bohemia; Böhmen; Boehmen)
      • Erzgebirge; Krusné Hory Mts
    Petr Fuchs
    Greece
     
    • Aegean Islands Department (Aiyaíon)
      • Kykládes Prefecture
        • Cyclade Islands (Cyclades; Kikladhes; Nomos Kikladhon)
          • Kimolos Island (Argentiera)
    [var: Opal-CT] Godelitsas, A.; Gamaletsos, P.& Roussos-Kotsis, M.(2010): Mordenite-bearing tuffs from Prassa quarry, Kimolos island, Greece. European Journal of Mineralogy. 22, 797-811
          • Milos Island (Melos)
    [var: Opal-AN] No reference listed
    Kilias, S.P., Naden, J., Cheliotis, I., Shepherd, T.J., Constandinidou, H., Crossing, J., and Simos, I. (2001): Mineralium Deposita 36, 32-44.
      • Lésvos Prefecture (Lesbos; Mytilene; Mytilini)
        • Lesbos Island (Nisos Lésvos; Mytilene; Mytilini)
    [var: Opal-AN] Christophos
      • Sámos Prefecture
        • Sámos Island
    Econ Geol (1989)84:788-798
    [var: Opal-CT] Helvaci, C., Stamatakis, M. G., Zagouroglou, C., & Kanaris, J. (1993). Borate minerals and related authigenic silicates in northeastern Mediterranean Late Miocene continental basins. Exploration and Mining Geology, 2(2), 171-178.
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Agios Konstantinos [St Constantine] (Kamariza)
    [var: Opal-AN] Ritter, K.H. (1978): Hyalit und Langit von Lavrion. Lapis, 3(10), 11.
    • Ionian Islands Department
      • Lefkas Prefecture
    Econ Geology (1993)88:91-103
    • Thraki Department (Thrace; Thracia)
      • Évros Prefecture
        • Alexandroupoli (Alexandroupolis)
    Vodouris, P. C. (2011): Conditions of formation of the Mavrokoryfi high-sulfidation epithermal Cu–Ag–Au–Te mineralization (Petrota Graben, NE Greece). Mineralogy and Petrology 101, 97-113.
    Greenland
     
    • Kujalleq
      • Narsaq
        • Ilímaussaq complex
    Petersen, O.V., Giester, G., Brandstätter, F., Niedermayr, G. (2002): Nabesite, a new mineral species from the Ilimaussaq alkaline complex. Canadian Mineralogist. 40, 173-181
    • Qaasuitsup
      • Qeqertarsuaq Island (Disko Island)
    Bøggild, O.B. (1953): The Mineralogy of Greenland. Meddelelser om Grønland, Bd. 149. Nr. 3. 445 pages. (p. 352)
    Honduras
    [var: Fire Opal] Rocks&Min 54:266
    • Gracias a Dios Department
    Rob Lavinsky specimen
    • Lempira Department
    Prüfer, P. (2002): Basalt-Opal aus Honduras. Lapis 27 (4): 35
    [Precious Opal var: Black Opal] N. Jb. Mineral. Abh. 186 (2009) 11-20.
    Hungary
    [Precious Opal] www.giant.net.au/users/bmi/prof.htm.
    • Borsod-Abaúj-Zemplén Co.
      • Zemplén Mtns (Tokaj Mtns)
        • Abaújszántó
    [var: Opal-AN] Szakáll: Topographia Mineralogica Hungariae III.
    Szakáll: Topographia Mineralogica Hungariae
        • Alsókéked
    Szakáll & Weiszburg: Telkibánya ( Top. Min. Hun.)
        • Arka
    Szakáll & Gatter: Hungarian Mineral Species, 1993
        • Bózsva
    Collection of Gábor _Mesics
    Szakáll & Jánosi: Minerals of Hungary, 1995
    Koch:Minerals of Hungary
    [var: Opal-AN]
    [var: Gold Opal]
    [var: Opal-AN]
    Szakáll & Gatter: Hungarian Mineral Species, 1993
    Koch: Minerals of Hungary, 1985
        • Fony
    Szakáll & Jánosi: Minerals of Hungary, 1995
        • Füzérradvány
    Szakáll & Jánosi: Minerals of Hungary, 1995
        • Golop
    [var: Opal-AN]
        • Gönc
    Szakáll & Jánosi : Minerals of Hungary, 1995
    [var: Opal-AN] Koch: Minerals of Hungary, 1985
        • Hejce
    Szakáll & Jánosi: Minerals of Hungary, 1995
        • Hollóháza
        • Komlóska
    Koch: Minerals of Hungary, 1985
    Szakáll & Jánosi: Minerals of Hungary, 1995
        • Legyesbénye
    [var: Opal-AN] Szakáll: Top.Min. Hun.
    Szakáll: Minerals of Szerencsi Hills (Top. Min. Hun.)
        • Megyaszó
    [var: Opal-AN]
    [var: Fire Opal]
        • Mogyorósok
    Szakáll-Gatter-Szendrei: Minerals of Hungary 2005
    [var: Opal-AN] [www.johnbetts-fineminerals.com]
    [var: Opal-AN] Szakáll: Topographia Mineralogica Hungariae III.
    [var: Opal-AN] Szakáll: Topographia Mineralogica Hungariae III.
    [var: Opal-AN] Szakáll: Topographia Mineralogica Hungariae III.
    [var: Opal-AN] Szakáll: Topographia Mineralogica Hungariae
    [var: Opal-AN] Szakáll: Topographia Mineralogica Hungariae III.
    Szakáll: Mineralogica Topographia Hungariae III.
    Szakáll:Top. Min. Hun.
        • Nagyhuta
    Szakáll & Jánosi: Minerals of Hungary, 1995
    [var: Opal-AN] Szakáll & Jánosi: Minerals of Hungary, 1995
        • Nyíri
    Szakáll & Gatter: Hungarian Mineral Species, 1993
        • Rátka
    Szakáll:100 Hungarian Mineral Localities,2004
        • Regéc
    Mineral Species of Hungary, 2005
        • Sárospatak
    Szakáll & Jánosi: Minerals of Hungary, 1995
    Szakáll & Jánosi: Minerals of Hungary, 1995
    [var: Milk Opal]
        • Szerencs
    [var: Opal-AN] Szakáll: Topographia Mineralogica Hungariae III.
        • Tállya
    [var: Opal-AN]
    Topographia Mineralogica Hungariae II. Szakáll&Weiszburg
    [var: Wood Opal]
    Szakáll & Weiszburg: Telkibánya
    [var: Opal-AN] Szakáll-Weiszburg: Telkibánya
    Szakáll-Gatter: Hungarian Mineral Species, 1996
        • Tokaj
    Szakáll & Jánosi: Minerals of Hungary, 1995
    [var: Opal-AN]
    Koch: Minerals of Hungary,1986
    Koch: Minerals of Hungary, 1985
    • Fejér Co.
      • Sárszentmiklós
    Szakáll: 100 Hungarian Mineral Locality
      • Szár Hill
        • Kőszárhegy
    Szakáll & Jánosi: Minerals of Hungary, 1995
      • Velencei Mtns
        • Pázmánd
    Szakáll & Jánosi: Minerals of Hungary, 1985
    • Heves Co.
      • Bükk Mtns
    [var: Wood Opal] GEODA 2004
      • Mátra Mtns
        • Gyöngyös
    Mineral Species of Hungary, 2005
    [var: Hungarian Opal]
    [var: Geyserite]
    GEODA 2002
    Szakáll-Jánosi: Minerals of Hungary,1995
    [var: Opal-AN] Own found,2006
    Book: 100 collecting sites of Hungary
        • Gyöngyöspata
    http://www.geomania.hu/lelohely.php?lelohely=379
    [var: Opal-AN] http://www.geomania.hu/lelohely.php?lelohely=323
        • Gyöngyössolymos
    [var: Opal-AN] Szakáll-Gatter-Szendrei: Hungarian Mineral Species,2006
    [var: Opal-AN] http://geomania.hu/lelohely.php?lelohely=416
    [var: Opal-AN] Körmendy Regina (2011): A Cseternás-bérci és Szén-pataki ércesedés nyomon követése (2011. augusztusi, októberi és novemberi kutatások eredményei). Lelőhely 2011/VII. p.8-18
    MAMIT
    [var: Opal-AN] T Ungvári collection
    Geoda, 2003
    Szakáll-Jánosi: Minerals of Hungary
    [var: Opal-AN] GEODA/2000, Own found.2006
    [var: Opal-AN] http://www.geomania.hu/lelohely.php?lelohely=441
    GEODA/1997
    Szakáll-Gatter: Hungarian Mineral Species
        • Kisnána
    [var: Opal-AN] Dávid Szabó
        • Markaz
    http://www.mineral.hermuz.hu
        • Mátraderecske
    Szakáll-Jánosi: Minerals of Hungary, 1995
        • Mátraszentimre
    Szakáll & Jánosi: Minerals of Hungary, 1995
        • Mátraszentlászló
    GEODA/2005
        • Recsk
    [var: Opal-AN] Szakáll - Gatter: Minerals of Hungary
    • Nógrád Co.
      • Börzsöny Mtns
    [var: Wood Opal]
      • Cserhát Mtns
        • Bercel
    Szakáll & Jánosi: Minerals of Hungary, 1995
    [var: Wood Opal] C. Lemanski, Jr. (re-entry of lost Mindat data).
    [var: Opal-AN]
        • Nagylóc
    Szakáll & Jánosi: Minerals of Hungary, 1995
    [var: Wood Opal] GEODA 2004
        • Sámsonháza
    Szakáll & Jánosi: Minerals of Hungary, 1995
        • Szanda
    GEODA 2004
      • Mátra Mtns
    Mineral Species of Hungary, 2005
        • Szurdokpüspöki
    Szakáll: 100 Hungarian Mineral Locality, 2004
    • Pest Co.
      • Börzsöny Mtns
        • Szokolya
          • Öl Hill
    Sándor Szakáll (2004): 100 Hungarian mineral localities
      • Szentendre
    Szakáll: 100 Hungarian Mineral Locality, 2004
    • Veszprém Co.
      • Bakony Mtns
    Koch: Minerals of Hungary, 1985
        • Várpalota
    Szakáll & Jánosi: Minerals of Hungary, 1995
      • Balaton Uplands
    Kiss, G. & Molnár, F. (2006) Mineralogy And Origin Of Geodes In The Balatonfelvidék Sandstone Formation At Csopak Village, Balaton Highland, Hungary. Acta Mineralogica-Petrographica, Abstract Series 5, Szeged, p54
        • Tapolcai Basin
          • Nemesgulács
    Szakáll & Jánosi: Minerals of Hungary, 1995
    Szakáll & Jánosi: Minerals of Hungary, 1995.
          • Uzsa (Uzsabánya)
    "Giorgio Bortolozzi (visual identification)"
    • Zala Co.
      • Keszthelyi Mtns
        • Cserszegtomaj
    Koch: Minerals of Hungary, 1985
    Iceland
     
    • Eastern Region
      • Suður-Múlasýsla
    Volker Betz (1981) Famous Mineral Localities: Zeolites From Iceland and the Faeroe Islands. Mineralogical Record 12:5-26
    • Vestmannaeyjar archipelago (Westman islands)
      • Heimaey island
        • Heimaey
    Balić-Žunić, T., Garavelli, A., Acquafredda, P., Leonardsen, E., & Jakobsson, S. P. (2009). Eldfellite, NaFe (SO4) 2, a new fumarolic mineral from Eldfell volcano, Iceland. Mineralogical Magazine, 73(1), 51-57.
      • Surtsey Island
    Jacobsson et al (1992) Encrustations from Lava Caves in Surtsey, Iceland. A Preliminary Report: Surtsey Research Progress Report X: 73-78 Reykjevik, Iceland.
    India
     
    • Andhra Pradesh
      • Visakhapatnam District
    Rocks & Min.: 8:7.
    • Jharkhand
      • Singhbhum District
    S. G. Tenainkai, A. G. Ugarkar, M. V. Koti and A. Mookherjee (1991) Copper-bearing clay minerals of the oxidized zone of the Rakha-Chapri Block, Singhbhum Copper Belt, India. Proceedings of the Indian Academy of Sciences, Earth and Planetary Sciences, 100, 13-30.
    • Maharashtra
      • Nashik District (Nasik District)
    White (2008)
    Indian Ocean
     
    • Ninety East Ridge (90° E Ridge; Indian Ridge)
      • D.S.D.P.
        • Leg 26
    D. Besse et al. , Bell. Minéral. , 1981, 104, pp. 56-63.
    Indonesia
     
    • Irian Jaya (New Guinea)
      • Papua Province
        • New Guinea
          • Carstensz Mts
            • Gunung Bijih District (Grasberg District)
    Prendergast, K. (2003). Porphyry-related hydrothermal systems in the Estberg District, Papua, Indonesia (Doctoral dissertation, James Cook University).
      • Banten Province
    [Precious Opal] Extra Lapis - English No. 10 Opal
    • Lesser Sunda Islands
      • Bali Province
    [var: Opal-AN] Rod Martin personal collection
    • Sumatera Island (Sumatra Island)
      • Bengkulu Province (Benkoelen Province; Benkulen Province)
        • Rejang Lebong District (Rediang Lebong District)
    Canadian Mineralogist Vol. 16, pp. 651-657 (1978)
    Israel
     
    • Negev
    Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
    • Northern District (HaZafon District)
      • Central Jordan Valley
        • Beit She'an
    • Southern District (HaDarom District)
    www.mineralmundi.com
    Italy
     
    • Basilicata
      • Potenza Province
        • Melfi
          • Vulture Mount
    "Giorgio Bortolozzi (visual identification)"
    • Calabria
      • Reggio Calabria Province
    [var: Opal-AN] samples in Messina University and Ferdinando Giovine collection
    [var: Opal-AN] Messina University collection Ferdinando Giovine collection
    • Campania
      • Naples Province
        • Somma-Vesuvius Complex
    Russo, M., 2006: I minerali di formazione fumarolica della grande eruzione vesuviana del 1906
      • Phlegrean Volcanic Complex
        • Naples Province
          • Phlegrean Fields
            • Pozzuoli
    Pichler, H., (1970): Italienische Vulkangebiete II, Bornträger Berlin Stuttgart
    • Emilia-Romagna
      • Parma Province
        • Berceto
          • Corchia mine
    ADORNI F., GUELFI F. (1997) - La miniera di Fe e Cu di Corchia, Berceto, Appennino Parmense. - Riv. Min. It., N. 3, 217-250.
    Adorni F., Guelfi F. (1997) - La miniera di Fe e Cu di Corchia, Berceto, Appennino Parmense. - Riv. Min. It. N 3, 217-250.
        • Medesano
          • Sant'Andrea Bagni
    Adorni, F., Tateo, F., Adorni, B. (2004): La melanoflogite di Case Montanini (S. Andrea Bagni, Medesano, Appennino parmense). Rivista Mineralogica Italiana, 28, 126-136.
    Adorni, F., Tateo, F., Adorni, B. (2004): La melanoflogite di Case Montanini (S. Andrea Bagni, Medesano, Appennino parmense). Rivista Mineralogica Italiana, 28, 126-136.
    • Friuli Venezia Giulia
      • Udine Province
        • Degano Valley
    "Giorgio Bortolozzi (visual identification)"
    • Latium
      • Latina Province
        • Ponza Island
    E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.
      • Rome Province
    Federico M., Gianfagna A. - Al, Ca and Fe3+ bearing opal pseudomorph after melilite in ejecta and lavas of the Alban Hills, Italy. pp. 149-157
    De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol
        • Rome
          • Valleranello
    "Giorgio Bortolozzi (visual identification)"
        • Sacrofano Caldera
          • Campagnano di Roma
    Eur. J. Mineral. , 1993, 5, pp. 53-58.
        • Tolfa Mts District
          • Allumiere
    Negretti,G.C.;Lombardi,G.;Morbidelli,L.:”Studio geopetrografico del complesso vulcanico tolfetano-cerite (Lazio).IV:Le manifestazioni vulcaniche acide del settore civitavecchiese tolfetano”,Quad.CNR,4,1-173 (1966).
    I minerali del Museo Archeominerario "Klitsche de la Grange"Allumiere,Provincia di Roma.(2000)
      • Viterbo Province
        • Montalto di Castro
          • Pietra Massa Locality
    [var: Opal-AN] Passaglia, E. & Turconi, B. (1982): Silicati ed altri minerali di Montalto di Castro - VT. Rivista Mineralogica Italiana, 4/1982, 97-110.
    • Liguria
      • Genova Province
        • Genova
          • Borzoli
    Giuseppe Pipino - L'antica miniera di Monte Ramazzo e i suoi minerali - Rivista Mineralogica Italiana, Milano, vol. 8, fasc. 3, 1977
    Antofilli, Borgo, Palenzona, 1985. I nostri minerali. Geologia e mineralogia in Liguria. Edizioni Melita, La Spezia.
        • Masone
    Antofilli, Borgo, Palenzona, 1985. I nostri minerali. Geologia e mineralogia in Liguria. Edizioni Melita, La Spezia.
        • Ne
          • Graveglia Valley
    "Giorgio Bortolozzi (visual identification)"
    [MinRec 32:356]
    "Giorgio Bortolozzi (visual identification)"
            • Reppia
    Redazione (2005): Sistematica ligure: resoconto 2005. Notiziario di Mineralogia Ferrania Club, 19, 3-5.
        • Tiglieto
          • Olbicella
    Cortesogno L., Lucchetti G., Penco A.M. - 1975 - Associazioni a zeoliti nel "Gruppo di Voltri" : caratteristiche mineralogiche e loro significato - rend. S.I.M.P. - Milano, vol. 31, n.2 pp. 673-710
      • La Spezia Province
        • Rocchetta Vara
    probed by Balestra C.
      • Savona Province
        • Sassello
    Antofilli, Borgo, Palenzona, 1985. I nostri minerali. Geologia e mineralogia in Liguria. Edizioni Melita, La Spezia.
    • Lombardy
      • Bergamo Province
    Maida, F. (2002): Descrizione delle specie e varietà di minerali e loro ritrovamento nella Bergamasca. G.O.M. Gruppo Orobico Minerali - Novecento Grafico, Ed., Bergamo 82 pp. (geologic part by F. Pezzotta).
      • Sondrio Province
        • Malenco Valley
          • Chiesa in Valmalenco
        • Novate Mezzola
    Ghizzoni, S. & Mazzoleni, G. (2005): Itinerari mineralogici in val Codera. Geologia Insubrica, Ed., Milano, 316 pp.
        • Valtellina
          • Grosio
            • Grosina Valley
    [var: Opal-AN] Tabacchi C. (1974) - Pegmatiti della Val Grosina (Sondrio) in - Notizie del Gruppo Min. Lombardo, Milano, fasc.4, Dec. 1974 pp. 85-86 ; Bedognè, F., Montrasio, A., Sciesa, E. (2006) I minerali della media-alta Valtellina, delle Orobie valtellinesi e della Val Poschiavo. Aggiornamenti sulle altre località della provincia di Sondrio. Bettini, Sondrio, 255 pp.
      • Varese Province
        • Ceresio Valley
    No reference listed
    [var: Opal-AN] Fabio Brignoli collection
    • Marche
      • Macerata Province
    Cingolani G. (1979) Antica ricerca di manganese di Monte San Vicino (Mc) - Rivista Mineralogica Italiana fasc. 3 pag. 84
    • Piedmont
      • Biella Province
    De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol.
    Piccoli, G. C., Maletto, G., Bosio, P., & Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo F. Eusebio - Alba, 607 pag.
          • San Paolo Cervo
    - Martini, B., Salvetti, A., Dalla Fontana, G., Boscardin, M., Rocchetti, I., Ciriotti, M.E., Taronna, M., Ambrino, P. (2012). I minerali delle cave di sienite Colombari e Vej della Balma Valle Cervo (Biella, Piemonte). Micro, 10, 110-135
    - Martini, B., Salvetti, A., Dalla Fontana, G., Boscardin, M., Rocchetti, I., Ciriotti, M.E., Taronna, M., Ambrino, P. (2012). I minerali delle cave di sienite Colombari e Vej della Balma Valle Cervo (Biella, Piemonte). Micro, 10, 110-135
      • Cuneo Province
        • Varaita Valley
          • Bellino
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
      • Novara Province
        • Pella
    [var: Opal-AN] Mariani P., Scaini G.: "I minerali d'Italia" - Rizzoli, 1978 - and A. Del Caldo, C. Del Moro, C.M. Gramaccioli, M. Boscardin M. "Guida ai Minerali" Fabbri ed. Milano, 1981
      • Torino Province
        • Canavese District
          • Baldissero Canavese
    Marinai & Scaini,1978. I minerali d'Italia, Rizzoli Editore,Milano
        • Caselette
          • Musinè Mt.
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
        • Casellette
    Jervis, G. (1873): I tesori sotterranei dell'Italia. Vol. 1: Regioni delle Alpi. Ed. Loescher, Torino, 410 pp.
        • Casternone Valley
          • Givoletto
            • Mt. Baron
    Fenoglio, M., Sanero, E., (1941): I giacimenti di magnesite delle Prealpi Piemontesi. Per. Mineral., 12, 83-111.
        • Lanzo Valleys
          • Balangero
    Prete, R. (1995): L'amiantifera di S. Vittore, Balangero, Torino. Rivista Mineralogica Italiana, 4/1995, 313-333.
          • Viù Valley
            • Viù
    Airaudi, D., Ambrino, P., Ciriotti, M.E., Blass, G. (2009). Baddelleyite in cristalli dalla rodingite del Malpass, Val di Viù, Piemonte. Micro (UK report), 2/2009, 100-111
        • Luserna San Giovanni
    Ambrino, P., Brizio, P., Ciriotti, M.E., Finello, G., Marello, B. (2009). Minerali della pietra di Luserna. AMI. CD-ROM (in italian and in english)
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
        • Susa Valley
          • Bussoleno
            • Tignai
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): MInerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
      • Verbano-Cusio-Ossola Province
        • Baveno
          • Oltrefiume
            • Mount Camoscio
    [var: Opal-AN] [MinRec 14:157]
        • Omegna
    - Albertini,C. (2000) : Ritrovamenti nel Rio Inferno, Brughiere di Omegna. Prima segnalazione nel granito di Baveno : uranofane-beta - Rivista Mineralogica Italiana, Milano, XXIV, 2, 88-92.
        • Ossola Valley
          • Antigorio Valley
            • Premia
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
          • Antrona Valley
            • Montescheno
    Rivista Mineralogica Italiana, 23 (1), 42-49
          • Crodo
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
    [var: Opal-AN] De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol.
          • Domodossola
            • Cosasca
    [var: Opal-AN] De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol.
          • Vigezzo Valley
            • Craveggia
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
    Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007): Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
            • Trontano
    Mattioli, V. (1976): Località mineralogiche consigliate: Rio Graja, Trontano, Valle Vigezzo. Notiziario del Gruppo Mineralogico Lombardo, 2/1976, 40-42
    • Sardinia
      • Cagliari Province
        • Capoterra
    Olmi F., Sabelli C., Senesi F., Stara P., 2002. La mineralizzazione uranifera di Arcu su Linnarbu. Riv. Miner. Ital., 3: 148-169.
    [var: Opal-AN] Conti-Vecchi G. Stara P. (1991) - Minerali della Sardegna - Edizioni Della Torre - Cagliari 276 pp
        • San Vito
          • Idda Mt.
    Stara P., Astolfi M. (1990) - San Priamo - Rivista Mineralogica Italiana, fasc. 1, pp. 51-63
      • Carbonia-Iglesias Province
        • Iglesias
    - Stara P., Rizzo R. e Tanca A.G. (1996) : Iglesiente e Arburese. Miniere e minerali. Vol. I (239 pagg.). EMSa Ed.
    [var: Opal-AN] Chinellato Matteo and Michael C. Roarke collections
      • Olbia-Tempio Pausania Province
    Gamboni, A. & Gamboni, T. (2006) - Gallura, Tesori nel Granito (i minerali delle pegmatiti granitiche) - J. Webber Ed,Sassari,190pp.
        • Arzachena
          • Mt. Mazzolu
    • Gamboni, A., Cuccuru, S., Casini, L. & Marini, A. (2012)- I minerali del Monte Mazzolu, Cava Lu Patenti, Arzachena (OT), Sardegna. Rivista Mineralogica Italiana, 3/2012, 144-157.
    S. Cuccuru, A. Gamboni & L. Casini (2011): The Mt. Mazzolu quarry: a new mineralogical locality. PLINIUS 37, 304.
        • Calangianus
    - Gamboni, A., Gamboni, T., Pileri, P. (1997): Su alcuni minerali del massiccio granitico del monte Limbara zona "Furru e Conca", comune di Calangianus. Rivista Mineralogica Italiana, 2/1997, 123-134.
        • La Maddalena
    Gamboni, A., Gamboni, T., Bucci, A. (1996): Ritrovamento di Bertrandite all’isola di Caprera, Arcipelago di La Maddalena. Rivista Mineralogica Italiana, 3/1996, 278-279
          • La Maddalena Island
    Billows, E. (1941): I minerali della Sardegna ed i loro giacimenti. Sardegna Mineraria, Istituto per gli studi Sardi, Regia Università di Cagliari.
    • Gamboni, A., Gamboni, T., Nonnis, O. (1997): I minerali dell'arcipelago di La Maddalena. Paolo Sorba, Ed., La Maddalena, 100 pp. ; Gamboni, A., Cuccuru, S., Gamboni, T. & Bargone, J. (2013). I minerali dell'isola di Spargi. Arcipelago di La Maddalena, Sardegna Nord Orientale. Rivista Mineralogica Italiana, 2/2013, 116-128.
        • Palau
    Gamboni A., Gentile P., Mascia S., De Vito A., Gamboni T., 2004. Monte Canu: uranofane-beta e altri minerali delle pegmatiti granitiche. Riv. Miner. Ital., 3: 138-145
        • Sant'Antonio di Gallura
    Gamboni, A., Gamboni, T. (1998) - Babingtonite e "Granati" delle pegmatiti granitiche della Gallura, Sardegna nord-orientale. Rivista Mineralogica Italiana, 4, Milano.
        • Telti
    Gamboni, A., Gelosa, M., Gamboni, T. (2001): Ortoclasio ed altri minerali delle pegmatiti di S. Bachisio, Telti, Gallura, Sardegna N.E. Rivista Mineralogica Italiana, 1/2001, 30-40
        • Tempio Pausania
          • Giogantinu and Balistreri Peaks
    Gamboni, A., Gamboni, T. (2006): Gallura, tesori nel granito, i minerali delle pegmatiti granitiche. Webber Editore, Sassari, 190 pp.
      • Oristano Province
    - Conti-Vecchi, G. & Stara, P.(1991): Minerali della Sardegna, Della Torre Edizioni, Cagliari, 276 pp.
        • Mt. Arci
          • Masullas
    "Giorgio Bortolozzi (visual identification)"
      • Sassari Province
    [var: Opal-AN] Antonio Gamboni Collection
    Conti-Vecchi, G. & Stara, P. (1991) - Minerali della Sardegna - Della Torre Ed,276pp.
    • Sicily
      • Messina Province
        • Eolie Islands (Aeolian Islands)
          • Lipari
    Russo, M. (2006): Il gesso delle valli del Faurdo e del Caolino (Isola di Lipari, Messina, Sicilia). Micro (notizie mineralogche), 2006, 51-54.
            • Vulcano Island
    PANICHI U. (1924): Contributo allo studio dei minerali dell'Isola di Vulcano. - Memorie della Società Italiana delle Scienze (detta dei XL) - serie 3 – 19, 3-55.
              • Porto Levante
    PANICHI U. (1913): Millosevichite, nuovo minerale del Faraglione di Levante, nell'Isola di Vulcano. - Atti R. Acc. Naz. Lincei - serie 5 - Rend. Cl. Sc. Fis. Mat. Nat. - 22, 5 , 303. PANICHI U. (1924): Contributo allo studio dei minerali dell'Isola di Vulcano. - Memorie della Società Italiana delle Scienze (detta dei XL) - serie 3 - 19, 3-55.
    P.Forti, M.Panzica La Manna and A.Rossi (1994) The peculiar mineralogic site of the Alum cave (Vulcano, Sicily). Proceedings of the 7th International Symposium on Vulcanospeleology November 1994 p.35-44.
    PANICHI U. (1924): Contributo allo studio dei minerali dell'Isola di Vulcano. - Memorie della Società Italiana delle Scienze (detta dei XL) - serie 3 - 19, 3-55. QUERCIGH E. (1935): Sul solfoselenio di Vulcano (Isole Eolie). - Rendiconti dell' Accademia delle Scienze Fisiche e Matematiche di Napoli - 32, 3-7. GARAVELLI C.L. (1958): Sulla natura del cosiddetto "solfoselenio" dell'isola di Vulcano. - Periodico di Mineralogia - 27, 1, 159-178.
    • Trentino-Alto Adige
      • Trento Province
        • Ala
          • Pilcante
    "Giorgio Bortolozzi (visual identification)"
        • Lagorai Group
    Ferretti, P., & Masetto, M. (2008). Cima d'Asta. Recenti ritrovamenti nelle pegmatiti del massiccio granitico (Trentino orientale). Rivista Mineralogica Italiana, 4/2008, 210-228.
        • Mocheni Valley
          • Pergine Valsugana
    "Giorgio Bortolozzi (visual identification)"
        • Valsugana
          • Roncegno
    Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
    • Tuscany
      • Florence Province
    Brizzi G., Meli R., 1996. I minerali della formazione ofiolitica dell'Impruneta (FI). Riv. Miner. Ital., 20: 81-98.
    Brizzi G., Meli R., 1996 - I minerali della formazione ofiolitica dell'Impruneta (FI). - Riv. Mineral. Ital., 20 1: 81-98.
      • Grosseto Province
        • Amiata Mt.
    [var: Fiorite] No reference listed
      • Livorno Province
        • Campiglia Marittima
    Biagioni, C., Orlandi, P., Gini, C., Bargellini, C., Gamucci, C., Marinai, V., Nannoni, R. (2013). Botro ai Marmi. I minerali delle miniere Maffei e Montorsi. Rivista Mineralogica Italiana, 1/2013, 63-83.
    Nannoni, R., & Marinai, V. (2008). Monte Spinosa. Nuovi ritrovamenti alle miniere Maffei e Montorsi. Rivista Mineralogica Italiana, 2/2008, 98-111.
        • Elba Island
          • Campo nell'Elba
    [var: Opal-AN] Orlandi, P., & Pezzotta, F. (1997). Minerali dell'Isola d'Elba. Edizioni Novecento Grafico, Bergamo, 249 pp.
    [var: Opal-AN] Barsotti, G., & Nannoni, R. (2006). Rocce, minerali e miniere delle isole dell'Arcipelago Toscano. Pacini editore, 152 pp.
    [var: Opal-AN] Orlandi, P., & Pezzotta, F. (1997). Minerali dell'Isola d'Elba. Edizioni Novecento Grafico, Bergamo, 249 pp.
          • Capoliveri
            • Cape Calamita Mine (Calamita Mine)
    G. Cocco, C. Garavelli, 1954 - Studio di alcuni problemi geochimici relativi al giacimento di ferro di Capo Calamita (Elba) - Rend. Soc. Min. It., 10: 269-350.
          • Porto Azzurro
    E. Manasse, 1912 - Ricerche petrografiche e mineralogiche sul Monte Arco (Isola d'Elba) - Atti Soc. Tosc. Sc. Nat., Mem. Serie A, 28:118-199.
          • Rio Marina
    Barsotti, G., & Nannoni, R. (2006). Rocce, minerali e miniere delle isole dell'Arcipelago Toscano. Pacini editore, 152 pp.
        • Livorno
    Sartori F. (1967) - La wolchonskoite di Castiglioncello (Livorno). Per. Mineral., Roma, 36, 103-124.
    Ref.: Sammartino F., "Minerali miniere e cave dei Monti Livornesi", Comune di Livorno, 2009.
      • Lucca Province
        • Apuan Alps
          • Vergemoli
            • Fornovolasco
    • Biagioni, C., Orlandi, P., & Bonini, M. (2008). Fornovolasco. Storia e minerali delle miniere di ferro presso Vergemoli (Alpi Apuane). Rivista Mineralogica Italiana, 4/2008, 230-252
        • Garfagnana
          • Villa Collemandina
    Barsanti M., 1989. "I granati di Villa Collemandina". Tesi di laurea inedita, Università di Pisa
      • Pisa Province
        • Monteverdi Marittimo
          • Canneto
    Nannoni, R., Capperi, M., 1989. Miniere e minerali della Val di Cecina. Gruppo Mineralogico Cecinese. Tip. Grafiche Favillini, Livorno.
        • Pomarance
    Brizzi G., Meli R. (1988) - Le pietre silicee della Fattoria di Monterufoli (PI) - Rivista Mineralogica Italiana, Milano, fasc. 3, pp. 101-110
        • Volterra
    Orlandi P., (2005). "Geositi minerari e mineralogici della provincia di Pisa" in La geologia della provincia di Pisa. Cartografia, geositi e banche dati, pp. 55-280, Provincia di Pisa, 2005
    Orlandi P., (2005). "Geositi minerari e mineralogici della provincia di Pisa" in La geologia della provincia di Pisa. Cartografia, geositi e banche dati, pp. 55-280, Provincia di Pisa, 2005
      • Siena Province
        • Murlo
          • Pompana
    R. Meli (1999): I minerali del Fosso della Chiesa, Murlo (Siena) - Riv. Mineral. Ital., 23, 2: 103-105
    • Umbria
      • Perugia Province
        • Spoleto
    Stoppa F., Scordari F., Mesto E., Sharygin V.V. and Bortolozzi G. - Calcium-aluminium-silicate-hydrate "cement" phases and rare Ca-zeolite association at Colle Fabbri, Central Italy (2010). Centr.Eur.J.Geosci. 2 (2), pag. 175-187 .
    • Veneto
      • Padova Province
        • Euganei Hills
          • Faedo
    "Giorgio Bortolozzi (visual identification)"
      • Vicenza Province
        • Cornedo Vicentino
          • Spagnago
    Lapis, 15 (12), 27-32+50.
        • Laghi
    Boscardin M., Daleffe A., Rocchetti I., Zordan A. “I minerali nel Vicentino”, Museo “G. Zannato”, Montecchio Maggiore (Vicenza), 2011.
        • Montecchio Maggiore
          • San Pietro
    "Giorgio Bortolozzi (visual identification)"
        • Tonezza del Cimone
    "Giorgio Bortolozzi (visual identification)"
    Japan
     
    • Hokkaido
      • Iburi Province
    Takeo Kato, Takeo Watanabe, Akira Nakamoto (1934) on the sulphur deposits associated with iron sulphide ore, found in the Quaternary Formation of Japan. Japan Journal of Geology and Geography, 15, 3-4, 287-324.
      • Kushiro Province
        • Akan National Park
          • Atosanupuri volcano (Iou-zan; Mount Iwo)
    Katsui, Yoshio (1962) Explanatory text of the Geological map of Japan, scale 1:50,000 - Kutcharo-ko (Abashiri-60), Abstract.
      • Okhotsk Subprefecture (Abashiri Province)
        • Kitami City
    Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.
      • Tokachi Province
        • Ashoro-cho (Asyoro-tyo)
    Suzuki, J. et al (1957) Journal of the Faculty of Science, Hokkaido University, Ser. 4, 9, 501-518.
    • Honshu Island
      • Chubu Region
        • Gifu Prefecture
          • Mizunami City
    specimens in several Japanese museums and private collections
          • Nakatsugawa City
    [var: Opal-AN] Alfredo Petrov collection.
    [var: Opal-AN] Alfredo Petrov collection
        • Ishikawa Prefecture
          • Enuma
    Chishitsu Chousajo (1902)
          • Komatsu City
    Ryoichi SADANAGA and Michiaki BUNNO (1974) THE WAKABAYASHI MINERAL COLLECTION Bulletin No. 7 The University Museum, The University of Tokyo
    Ryoichi SADANAGA and Michiaki BUNNO (1974) THE WAKABAYASHI MINERAL COLLECTION Bulletin No. 7 The University Museum, The University of Tokyo
    Hiroaki Tano specimens
    [var: Menilite] Hiroaki Tano's specimen, and it's known in the Noto Area for many years
        • Nagano Prefecture
          • Chino City
    H. Minato (1953) Koubutsugaku Zasshi, 1, #2, 67
        • Niigata Prefecture
          • Osudo
    Takahisa Yoshimura & Yujin Ishizuka (1989) Ferrierite in a hydrothermal alteration zone around the murakami sericite deposit. Journal of the Clay Science Society of Japan (in Japanese); 29:179-186
        • Shizuoka Prefecture
          • Shimoda City
            • Rendaiji
    (unpublished species lists maintained by local collectors; needs confirmation)
        • Toyama Prefecture
          • Kami-Niikawa-gun
    Chishitsu Chousajo (1902)
        • Yamanashi Prefecture
    Chishitsu Chousajo (1902)
      • Chugoku Region
        • Hiroshima Prefecture
          • Hiroshima City
    [var: Opal-AN] alfredo petrov specimens
        • Okayama Prefecture
          • Katsuyama
            • Teragohchi
    H. Momoi (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 65-72.
      • Kanto region
        • Chiba prefecture
          • Minamiboso city
    H. Imai collection
        • Gunma Prefecture
    Mineralogical Journal Vol. 20 (1998) , No. 1 pp 1-8
        • Ibaraki Prefecture
          • Makabe-gun
            • Makabe-machi
    [var: Opal-AN] Alfredo Petrov specimens, received from Colorstone Mithrill, Tokyo.
      • Kinki region
        • Mie Prefecture
          • Ise City
    Kimura, T. & Nampei, H. (1982) Geoscience Magazine, 32, 153-160.
        • Nara Prefecture
    Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960)
        • Shiga Prefecture
          • Otsu City
    [var: Opal-AN] Nakatsugawa Mineral Museum (Gifu Prefecture, Japan)
          • Ritto City
    Hiroaki Tano's collection
      • Tohoku Region
        • Akita Prefecture
          • Yuzawa
            • Ogachi
    T. Nakanishi, E. Izawa, K. Watanabe (2003) Mineralogical and Geochemical Characteristics of Siliceous Sinter in Japan. Proceedings 25* NZ Geothermal Workshop 2003 pp155-160.
        • Aomori Prefecture
          • Goshogawara City
    Dr. Matsuo Nambu collection (curated at Geological Survey of Japan)
        • Fukushima Prefecture
          • Date
    Chishitsu Chousajo (1902)
    Masutomi Museum specimen (Kyoto)
    Chishitsu Chousajo (1902)
        • Iwate Prefecture
    Takeo Kato, Takeo Watanabe, Akira Nakamoto (1934) on the sulphur deposits associated with iron sulphide ore, found in the Quaternary Formation of Japan. Japan Journal of Geology and Geography, 15, 3-4, 287-324.; Iichiro Takahashi (1957) Studies on the Sulphur and Iron-Sulphides Deposits of the Matsuo Mine (2). Mining Geology 7:104-111
          • Noda
    Watanabe, T. (1959) Mineralogical Journal, 2, 6, 408-421
        • Miyagi Prefecture
    Seki, Y. and Okumura, K. (1968) Yugawaralite from Onikobe active geothermal area, Northeast Japan. Jour. Japan. Assoc. Min. Pet. Econ. Geol., 60, #1, 27-33.
          • Zao-machi
    [var: Diatomite] Dr. Matsuo Nambu collection (curated at Geological Survey of Japan)
        • Yamagata Prefecture
          • Tsuruoka
            • Atsumi-cho
    Mizota (1969) Ganseki-Koubutsu-Koshogaku Zasshi, 62, 329-338.
    • Kyushu Region
      • Fukuoka prefecture
    [var: Opal-AN] Uehara, S., et al. (2014) Minerals from Kyushu and Yamaguchi. (Fukuoka Mineral Club, 355 pages)
      • Kagoshima Prefecture
        • Hishikari gold deposit (Hishikari gold mine)
    Fulin Zhang, Chengmo Jin, and Qiyun Qing (1986): Geology and Prospecting 22(6), 9-12
        • Kirishima City
          • Makizono
    Alfredo Petrov collection
      • Nansei Archipelago
        • Kagoshima Prefecture
          • Mishima village
    S. Hamasaki (2002) Earth Planets Space 54, 217-229.
    Amir Akhavan Collection
    S. Hamasaki (2002) Earth Planets Space 54, 217-229.
    Amir Akhavan Collection
      • Saga Prefecture
        • Karatsu City (Higashi-Matsuura-gun)
          • Hizen-cho
    [var: Opal-AN] Miyawaki R, Matsubara S, Yokoyama K, Iwano S, Hamasaki K, Yukinori I (2003) Kozoite-(La), La(CO3)(OH), a new mineral from Mitsukoshi, Hizen-cho, Saga Prefecture, Japan. Journal of Mineralogical and Petrological Sciences 98, 137-141
    [var: Opal-AN] Miyawaki, R., Matsubara, S., Yokoyama, K., Takeuchi, K., Terada, Y., & Nakai, I. (2000). Kozoite-(Nd), Nd (CO3)(OH), a new mineral in an alkali olivine basalt from Hizen-cho, Saga Prefecture, Japan. American Mineralogist, 85(7-8), 1076-1081.
          • Kyuuragi-machi
    Katsu Kaneko (1956) Symposium del Manganeso, XX Congreso Geologico Internacional, Mexico D.F.
    • Shikoku Island
      • Kochi Prefecture
    Kaneko, K. (1956) Symposium sobre yacimientos de manganeso. Vol. 4, 184 (Mexico, 1956)
    • Tokyo Prefecture
      • Izu Archipelago
    Alfredo Petrov - field observations, 4-2014
    [var: Opal-AN] field collected by Alfredo Petrov, 12-2011
      • Ogasawara Islands
        • Chichijima Group
          • Chichi Island (Chichijima)
    Mineralogical Journal Vol. 11 (1982) , No. 1 pp1-14
    Mineralogical Journal Vol. 11 (1982) , No. 1 pp1-14
      • Volcano Islands (Kazan Rettou)
        • Iou Island (Iou-to; Iwo-Jima; Iwojima; Iou-jima; Naka-Iou-jima)
    Gordon A. MacDonald (1948) Petrography of Iwo Jima. Bulletin of the GSA, 59, 1009-1018.
    Kazakhstan
     
    • Almaty Province (Almaty Oblysy; Almati Oblast')
      • Chu-Ili Mts
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    • Eastern Kazakhstan Province (Shyghys Qazaqstan Oblysy; Vostochno-Kazakhstanskaya Oblast')
      • Tarbagatai Range
        • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
    Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
    • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
      • Balkhash Region (Balqash; Karatas; Prebalkhashie)
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
      • Betpakdala Desert (Bet-Pak-Dal Desert)
    Ermilova, L. P. & Senderova, V. M. (1961): Betpakdalite, a new mineral from the oxidation zone of the wolframite ore deposit of Karaoba (Central Kazakhstan). Zapiski Vserossiiskogo Mineralogicheskogo Obshchestva 90, 425-430. (in Russian) ; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
      • Karkaralinsk Rayon
        • Karkaralinsk (Qarqaraly; Karsakpaj; Qarsaqpaj; Kaskelen)
    Pavel M. Kartashov data
      • Zhana-Arkinskii rayon
    Gems of Kazakhstan, - textbook, Almaty, 1999, v.1, pp. 71-73 (in Rus.)
    [var: Fire Opal] Oleg Lopatkin collection
    Kenya
     
    • Rift Valley Province
      • Suswa Volcano
    Forti, P. et al. (2004), "Minerogenesis of volcanic caves of Kenya". Int. J. Speleol. 32, 3-18
    Kosovo
     
    • District of Pristina (District of Prishtina)
      • Cikatovo
    Mineral deposits and mining districts of Serbia Compilation map and GIS databases, 2002, J. Monthel, P. Vadala, J.M. Leistel, F. Cottard with the collaboration of M. Ilic, A. Strumberger, R. Tosovic, A. Stepanovic, March 2002 BRGM/RC-51448-FR
      • Glavika
    Mineral deposits and mining districts of Serbia Compilation map and GIS databases, 2002, J. Monthel, P. Vadala, J.M. Leistel, F. Cottard with the collaboration of M. Ilic, A. Strumberger, R. Tosovic, A. Stepanovic, March 2002 BRGM/RC-51448-FR; Buletini i Shkencave Gjeologjike 2012
    Madagascar
     
    • Antananarivo Province
      • Vakinankaratra Region
        • Antsirabé 2 District
          • Vinaninkarena Commune
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
        • Antsirabé City
    [var: Opal-AN] Knut Edvard Larsen collection # M-190
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
        • Sahatany Pegmatite Field (Mt Ibity area)
          • Manandona Valley
    Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
          • Sahatany Valley
    Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de doctorat de L'Universite Paul Sabatier, Toulouse
    Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse
    • Fianarantsoa Province
      • Amoron'i Mania Region
        • Ambatofinandrahana District
          • Mandrosonoro area
            • Ambatovita
    Knut Eldjarn specimen & photo
          • Mangatabohangy Commune (Mangatobangy)
    Pezzotta, F. (1996): Mangatobangy. Amethyst-Zepter aus Madagascar. Lapis 21 (9), pp 32-35
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Geologique A. 1871
        • Ambositra District
          • Manandriana Commune
            • Ambatofangehana
    Lacroix, A. (1899): Matériaux pour la Minéralogie de Madagascar. IV. Brochantite d'Ambatofangehana (Province d'Ambositra). Bulletin du Muséum national d'histoire naturelle 5 : 318-319
    • Toamasina Province (Tamatave)
      • Alaotra-Mangoro Region
        • Ambatondrazaka District
          • Ambatosoratra Commune
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
    • Tuléar Province (Toliara)
      • Androy Region
        • Ambovombe District
          • Andalantanosy Commune
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
        • Tsiombe District (Tsihombe)
          • Tsiombe Commune
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
      • Anosy Region (Fort Dauphin Region)
        • Amboasary District
          • Behara Commune
    Michel Arliguie photo and specimen
        • Betroka District
          • Benato-Toby Commune
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
          • Mahasoa East Commune
    Lacroix, A. (1922): Mineralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A.Challamel (Éditeur), Paris. 624p. (p.558-561)
      • Southwestern Region
        • Betioky District
          • Lazarivo Commune
    Behier, J. (1963): Carte mineralogique de Madagascar. Archive Service Géologique Madagascar. A 1871
    Malaysia
     
    • Borneo Island
      • Sarawak
    Yajima, S. (1960). Metacinnabar from Sarawak and Japan, with Reference to Its Stability Relations to Cinnabar. Mineralogical Journal, 3(1), 9-18.
    Mineralogical Magazine (1983): 47: 79-80.
    Mali
     
    • Kayes Region
      • Nioro du Sahel Circle
    Mars
     
    • Oxia Palus quadrangle
    Gornitz, V. (2008) Mineral News, 24, #9, 1-2.
    • Valles Marineris
    Bishop, J. L., et al. (2009), Mineralogy of Juventae Chasma: Sulfates in the light-toned mounds, mafic minerals in the bedrock, and hydrated silica and hydroxylated ferric sulfate on the plateau, J. Geophys. Res., 114, E00D09, doi:10.1029/2009JE003352, [printed 115(E2), 2010].
    Mexico
     
    • Baja California (Baja California Norte; BC Norte)
      • Mun. de Tijuana
        • Tijuana
    [var: Fire Opal] Rob Lavinsky
    • Baja California Sur (BC Sur)
      • Mun. de Mulegé
    RODRIGUEZ-DIAZ, Augusto Antonio et al. Metallogeny of the Santa Rosa manganese deposit, Baja California Sur, Mexico. Bol. Soc. Geol. Mex [online]. 2010, vol.62, n.1, pp. 141-159
    • Chihuahua
      • Mun. de Aldama
    Peter Megaw collection
    Cross, B. & Culp Zeitner J. (2006), Geodes Natures Treasures, P.23
        • Peña Blanca District
          • Sierra Peña Blanca
    Econ Geol (1991) 86:233-248
    http://www.swri.org/4org/d20/ghs/PBlanca/mineral.html; Econ Geol (1991) 86:233-248; Schindler, M. et al. (2010): Geochim. Cosmochim. Acta 74, 187-202.; Othmane, G., Allard, T., Menguy, N., Morin, G., Esteve, I., Fayek, M., & Calas, G. (2013). Evidence for nanocrystals of vorlanite, a rare uranate mineral, in the Nopal I low-temperature uranium deposit (Sierra Peña Blanca, Mexico). American Mineralogist, 98(2-3), 518-521.
    Mineralium Deposita, 44 (2009) 363-370
    • Coahuila
      • Mun. de Cuatrociénegas
        • Cuatro Ciénegas (Cuatrociénegas de Carranza; Venustiano Carranza)
          • Limestone caves
    [var: Opal-CT] Forti, P. et al. (2006): ACTA CARSOLOGICA 35/1, 79–98.
      • Mun. de Sierra Mojada
        • Sierra Mojada
    [var: Opal-AN] Panczner(1987):228-286.
    • Durango
    [AmMin 85:263]
      • Mun. de Coneto de Comonfort
        • América-Sapioris District (Potrillos)
          • Sierra de San Francisco
            • Potrillos
    [var: Opal-AN] Yves Masson photo
        • Coneto de Comonfort
    No reference listed
      • Mun. de Durango
        • Cerro de los Remedios
          • Victoria de Durango
    [var: Opal-AN] No reference listed
      • Mun. de Mapimí
    J.Hyrsl (2012) Gemstones of Peru, p. 62
      • Mun. de Mezquital
        • Mezquital
    [var: Wood Opal] Panczner (1987): 286.
    • Guanajuato
      • Mun. de Cuerámaro
        • Cuerámaro
    [Precious Opal] Panczner(1987):286.
      • Mun. de Pénjamo
        • Pénjamo
    [Precious Opal] Panczner(1987):287.
      • Mun. de Santa Catarina
        • Santa Catarina
          • Cerro de las Fajas
    Panczner (1987): 287.; Am Min (1955) 40 (1-2), 64-69
    • Hidalgo
      • Mun. de Zimapán
    [var: Fire Opal]
    Panczner(1987): 93-396.
    • Jalisco
      • Mun. de Magdalena
        • La Amazata
    [Precious Opal] Panczner(1987):287.
    [Precious Opal] Panczner(1987):287.
    [var: Fire Opal]
    [Precious Opal] Panczner (1987): 287.
    [Precious Opal] Panczner (1987): 287.
        • San Andrés
    [Precious Opal] Panczner(1987): 288.
        • San Simón
    [Precious Opal] Panczner(1987):288.
    [Precious Opal] Panczner (1987): 288.
      • Mun. de San Cristóbal de la Barranca
        • El Salvador
    [Precious Opal] Panczner(1987):288.
    [Precious Opal] Panczner(1987):288.
    • Mexico
      • Mun. de Temascaltepec
        • Temascaltepec de González (Temascaltepec)
    Camprubi, A., Canals, A., Cardellach, E., Prol-Ledesma, R.M., Rivera, R., 2001, The La Guitarra Ag-Au low-sulfidation epithermal deposit, Temascaltepec district, Mexico: vein structure, mineralogy, and sulfide-sulfosalt chemistry. Society of Economic Geologists Special Publication, v. 8, p. 133-158.
    • Michoacan
      • Uruapan del Progreso (Uruapan)
    [var: Opal-CT] Fritsch, E., Gaillou, E., Ostroumov, M., Rondeau, B., Devouard, B., Barreau, A. (2004) Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru. European Journal of Mineralogy, 16, 743-752
    • Nayarit
      • Mun. de Jalisco
        • La Curva
    [Precious Opal] Panczner(1987):288.
      • Mun. de La Yesca
        • La Yesca
    Panczner(1987):288.
    • Puebla
      • Mun. de Ixtacamaxtitlán
        • Ixtacamaxtitlán
    Tritlla J., Morales J.M., Camprubí A., Iriondo A., Corona-Esquivel R., González-Partida E., Levresse G., and Carrillo-Chávez A. A 2004. The ixtacamaxtitlan kaolinite deposit and sinter (Puebla state, Mexico): a magmatic-hydrothermal system telescoped by shallow paleoaquifer. Geofluids, 4, 4, 329.
    [var: Mexican Fire Opal]
      • Mun. de Amealco
        • Amealco
    [Precious Opal] Panczner (1987): 288.
    [var: Mexican Fire Opal]
      • Mun. de Ezequiel Montés
        • Ezequiel Montés
    [Precious Opal] Panczner(1987):289.
      • Mun. de Tequisquiapan
        • La Trinidad
    Rob Lavinsky
    [var: Opal-AN] No reference listed
    [var: Opal-AN] Cook, R.B. (2013) Connoisseur's Choice: Buergerite (Fluor-buergerite) Mexquitic, San Luis Potosi, Mexico. Rocks & Minerals, 88, #5, 442-446.
      • Mun. de Villa de Arriaga
    [var: Opal-AN] various added photos
    • Sonora
      • Mun. de Moctezuma
        • Moctezuma
    Carles Curto specimen
    • Zacatecas
    [var: Opal-AN] Van King
        • El Copetillo
    Christiansen, E. H., Sheridan, M. F., and Burt, D. M., 1986, The Geology and Geochemistry of Cenozoic Topaz Rhyolites from the Western United States, GSA Special Paper 205, 82 p.
    Mongolia
     
    • Dornogovi Aimag
    Pavel M. Kartashov data
    • Gobi Desert
    Kynicky, J., Chakhmouradian, A.R., Xu, C., Krmicek & Galilova, M. (2011): Distribution aand evolution of zirconium mineralization in peralkaline granites and associated pegmatites of the Khan Bogd Complex, southern Mongolia. Canadian Mineralogist. 49, 947-965.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
    FAVREAU G. & DIETRICH J.E. (2006) Tachgagalt (Maroc), Le Cahier des Micromonteurs, 93, 37-71. (in French)
        • Tazenakht
          • Bou Azer District (Bou Azzer District)
            • Aït Ahmane
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
    Namibia
     
    • Erongo Region
    [var: Opal-AN] MinRec, Jan/Feb 2001
      • Karibib District
    [var: Opal-AN] E. Schnaitmann, F. Brandstätter, U. Kolitsch and G. Niedermayr (2008): Die „Gitterquarz“-Paragenese aus dem Erongo, Namibia. Mineralien-Welt 20 (1), 55-63.
        • Spitzkopje Area
    Cairncross, B. (2005) Famous Mineral Localities: Klein Spitzkoppe, Namibia. Mineralogical Record 36(4) 317-335
    [var: Opal-AN] Schnaitmann, E. A., Nägele, H., Niedermayr, G., Brandstätter, F. & Jahn, S. (2007): Das Metazeunerit-Pocket auf Tubussis 22, Erongo. Mineralien-Welt 18 (2), 33-43. (in German)
        • Usakos
    No reference listed
    Natural History Museum Vienna collection
      • Omaruru District
        • Omaruru
    Jahn, S. & Bast, R. (2006): Der Krantzberg bei Omaruru, Namibia, und die Mineralvorkommen in seiner Umgebung. Mineralien-Welt 17 (3), 32-48.
    • Karas Region
      • Karasburg District
        • Warmbad
          • Orange River
    [var: Opal-AN] Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 386 pp. (in English)
    • Khomas Region
      • Gamsberg Area
    Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 668 pp. (in English)
      • Windhoek District
        • Aris
    Wartha, R., Palfi, A., Niedermayr, G., Brandstätter, F. and Petersen, O. V. (2001): Der Aris-Phonolith-Komplex und seine Mineralien. In Bahmann, U. and A. (Eds.), Namibia – Zauberwelt edler Steine und Kristalle, Bode-Verlag, Haltern, Germany, pp. 172-179. (in German)
    New Caledonia
     
    • Northern Province
    Briggs, R. M. (1975). Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia (Doctoral dissertation, ResearchSpace@ Auckland).
    Briggs, R. M. (1975). Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia. Thesis (PhD-Geology), University of Auckland, 1975.
    New Zealand
     
    • Kermadec Islands
    de Ronde, C.E.J.; Hannington, M.D.; Stoffers, P.; Wright, I.C.; Ditchburn, R.G.; Reyes, A.G.; Baker, E.T.; Massoth, G.J.; Lupton, J.E.; Walker, S.L.; Greene, R.R.; Soong, C.W.R.; Ishibashi, J.; Lebon, G.T.; Bray, C.J.; Resing, J.A. 2005 Evolution of a submarine magmatic-hydrothermal system : Brothers volcano, southern Kermadec arc, New Zealand. Economic geology, 100(6): 1097-1133
    • Mayor Island (Tuhua)
    NZJGG, 2003, 46: 581-590. NZJGG, 1991, 34: 337-340. NZJGG, 1981, 24: 449-467
    NZJGG, 2003, 46: 581-590. NZJGG, 1991, 34: 337-340. NZJGG, 1981, 24: 449-467
    • North Island
      • Auckland
    [var: Opal-AN] Collection of RJ Martin
      • Bay of Plenty
    Schwarz-Schampera, U.,et al. (2007) Cruise Report SONNE 192/2, MANGO. Marine Geoscientific Research on Input and Output in the Tonga-Kermadec Subduction Zone
    R.MARTIN, K.A.RODGERS, P.R.L.BROWNE The nature and significance of sulphate-rich, aluminous efflorescences from the Te Kopia geothermal field, Taupo Volcanic Zone, New Zealand. Mineralogical Magazine, June 1999, Vol. 63(3), pp. 413-419
    [var: Opal-AN] The Ngatamariki Geothermal Field, NZ: Surface Manifestations - Past and Present. Brotheridge, J.M.A. Browne, P.R.L. Hochstein, M.P. Proceedings 17th NZ Geothermal Workshop 1995 p61
      • Northland
        • Kaipara
    Mason, B. (1957): Larnite, scawtite, and hydrogrossular from Tokatoka, New Zealand. American Mineralogist 42, 379-392.
        • Puhipuhi
    Gary Leske specimen, 1984.
    Aurora Minerals, 2005, PROSPECTING PERMIT 39 270 HAZELBROOK, NORTHLAND NEW ZEALAND ANNUAL REPORT, Ministry of Economic Development New Zealand Unpublished Petroleum Report MR4188
    [var: Opal-AN] Judy Rowe and Alfredo Petrov specimens
      • Waikato
        • Taupo
          • Atiamuri
    Collection of Rod Martin
    The Rotokawa geothermal System. Krupp & Seward 1978, Economic Geology. 82 pp 1109-1129
          • Orakeikorako Thermal Area
    Rod Martin, Minerals of Ruatapu Cave, Orakei Korako, Taupo Volcanic Zone. Essence of Microscope (NZ)
          • Wairakei
    Zeolites of the World, Rudy W. Tschernich 1992
        • Thames-Coromandel
          • Tairua
            • Tairua River
    R. Martin. Tairua Essence of Microscope, 2009
    • South Island
      • Canterbury
    [var: Opal-AN] Judy Rowe Collection
      • Otago
    [var: Opal-AN] Knut Edvard Larsen collection # MM- 3930 (collected by Dick Dufton)
    [var: Opal-AN] Judy Rowe collection
        • Oamaru
    [var: Opal-AN] Old Mill or Dog Pound Quarry, Oamaru, Essence of Micro-Scope (NZ), Auton and Thornton
        • Waitaki
    [var: Opal-AN] Judy Rowe Collection
    Norway
     
    • Akershus
      • Asker
    Stensrud, S. (2004): Mineralfunn i ny sikkerhetstunnel i Vardåsen og langs ny gangvei langs Heggedalsveien i Asker i 2002-2003. Norsk Bergverksmuseum Skrift 28: 76-102
    Stensrud, S. (2004): Mineralfunn i ny sikkerhetstunnel i Vardåsen og langs ny gangvei langs Heggedalsveien i Asker i 2002-2003. Norsk Bergverksmuseum Skrift 28: 76-102
      • Eidsvoll (Eidsvold)
        • Minnesund
    Kvamsdal, L.O., Eldjarn, K. (2006): Mineralene i smaragdgruvene ved Byrud gård, Minnesund, Norge. STEIN 33 (4), 4-20
      • Nittedal
    L. O. Kvamsdal (1998): Mineralene fra Nordmarkitt og Grefsensyenitt i Oslofeltet. AS Merkur-Trykk, Oslo(in Norwegian), p. 22.
    • Aust-Agder
      • Iveland
        • Frikstad
    [var: Opal-AN] Revheim, O. (2004): Gadolinitt-(Y) og andre mineraler fra Slobrekka. Norsk Bergverksmuseum Skrift 28: 43-50
    • Buskerud
      • Drammen
        • Drammensmarka
    Berg, H.-J. (198?): Myrseter-Landfall. Turguide. (unpublished collectors guide)
    Nordrum, F.S. & Larsen, A.O.(1999): Einige neue Mineralfunde aus dem Gebiet Drammen-Holmestrand in Norwegen. MineralienWelt 10 (6):57-61
    [var: Opal-AN] Nordli, Ø. (1997): Ny E 134 Drammen- Nedre Eiker. Mineraler fra veiutbyggingen. STEIN 24 (3), 116-121
      • Hurum
    [var: Opal-AN] Knut Edvard Larsen MM-collection (#1089)
      • Nedre Eiker
        • Nedre Eiker Church
    Raade, G. (1969): Contribution to the Mineralogy of Norway, No 40. Cavity minerals from the permian biotite granite at Nedre Eiker Church. Norsk Geologisk Tidskrift 49, 227-239.
    • Nordland
      • Hamarøy
        • Finnøy
    Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum, skrift 38, 5-28.
    • Oppland
      • Lunner
        • Nordmarka
    Raade, G. & Haug, J.(1982): Gjerdingen. Fundstelle seltener Mineralien in Norwegen. LAPIS 7, 9-15
        • Øståsen
          • Surka
    Kvamsdal, L.O. (1993): Noen mineraler fra nordmarkitten mellom Roa og Maura. STEIN 20 (1), 30-45
    • Oslo
      • Grorud
        • Bånkall
    Kvamsdal, L.O. (1998): Mineralene fra Nordmarkitt og Grefsensyenitt i Oslofeltet. AS Merkur-Trykk, Oslo. 72p
    Kvamsdal, L. O. (1999): Mineralene fra Huken pukkverk i Oslo. STEIN 26 (4), 14-47
    • Sogn og Fjordane
      • Jølster
    Larsen, K.E. & Nordrum, F.S. (2013): Noen funn av mineraler i Norge 2012-2013. Norsk Bergverksmuseum Skrift. 50, 111-117
    • Sør-Trøndelag
      • Oppdal
    [var: Opal-AN] Witsø, T. (1995): Mineraler i Oppdal med beskrivelse. Driva Kro og steinsenter. Unpublished paper. http://vinstradalen.no/pdf/Mineraler.pdf
    [var: Opal-AN] http://www.strahlen.org/vp/no/bjornaa/
    [var: Opal-AN] Witsø, T. (1995): Mineraler i Oppdal med beskrivelse. Driva Kro og Steinsenter. Unpublished paper. http://vinstradalen.no/pdf/Mineraler.pdf
    [var: Opal-AN] Witsø, T. (1995): Mineraler i Oppdal med beskrivelse. Driva Kro og steinsenter. Unpublished paper. http://vinstradalen.no/pdf/Mineraler.pdf
        • Trollheimen Mts
    [var: Opal-AN] Witsø, T. (1995): Mineraler i Oppdal med beskrivelse. Driva Kro og steinsenter. Unpublished paper. http://vinstradalen.no/pdf/Mineraler.pdf
    • Telemark
      • Drangedal
        • Tørdal
    Raade, G. & Kristiansen, R. (2000a): Mineralogy and geochemistry of the Heftetjern granite pegmatite, Tørdal: a progress report. Norsk Bergverksmuseum Skrifter. 17, 19-25
      • Kragerø
        • Valberg
    Peter Andresen observation oct.2003
      • Porsgrunn
        • Eidanger
          • Bergsbygda
    Svein A.Berge observation on collected materiale august 2012
      • Skien
    Jamtveit B., Dahlgren S. and Austrheim H. (1997): High-grade contact metamorphism of calcareous rocks from the Oslo Rift, Southern Norway. American Mineralogist. 82 : 1241 - 1254
    • Vestfold
      • Holmestrand
        • Fjordveien
    [var: Opal-AN] Nordrum, F.S. (2012): Noen funn av mineraler i Norge 2011-2012. Norsk Bergverksmuseum Skrifter. 49, 117-124
    L. O. Kvamsdal (1998): Mineralene fra Nordmarkitt og Grefsensyenitt i Oslofeltet. AS Merkur-Trykk, Oslo (in Norwegian), p. 24.
    [var: Opal-AN] Nordrum, F.S., Larsen, S. Bergstrøm, T & Larsen, A.O. (1997): Mineralfunn langs ny E 18 i Drammen og Nordre Vestfold. STEIN 24 (3), 102-110
      • Larvik
        • Hedrum
    [var: Opal-AN] Larsen, K. E. & Andersen, F. (2009): Mineralforekomster i den østlige delen av Siljan-Hvarnes plutonkompleks, sørvestre Vestfold. Norsk Bergverksmuseums Skrift, 41: 54-63
          • Farris
    S. A. Berge
        • Malerød
    Andersen, F., Berge, S.A. & Burvald, I. (1996): Die Mineralien des Langesundsfjords und des umgebenden Larvikit-Gebietes, Oslo-Region, Norwegen. Mineralien-Welt 7(4), 21-100
        • Pauler
    Field observarions by Peter Andresen, 2010.
    Brøgger, W.C. (1890): Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Kristallographie und Mineral.16. p.15
        • Tvedalen
    Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
    Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp.
      • Re
        • Ramnes
    Andersen, F. & Berge, S. A. (1994): Himberg pukkverk, Ramnes, Vestfold. STEIN 21 (2), 96-102
      • Sandefjord
        • Fokserød
    Berge, S.A. & Larsen,A.O.(1980): Mineraler fra Sandefjordsområdet-IV.Granater".NAGS-nytt 7(2),21-24. (in norwegian)
        • Haneholmveien
    [var: Opal-AN] Larsen, K. E. & Kolitsch, U. (2012): An unique mineral suite in a syenite pegmatite at Virikkollen, Sandefjord, Larvik Plutonic Complex, Norway. Norsk Bergverksmuseum Skrifter. 49, 35-44
        • Råstad
    Engvoldsen,T.,Andersen, F.,Berge, S.A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18(1),15-71
        • Vesterøya
    Berge, S.A., Larsen, K.E. & Andersen, F. (2011): Buer, Vesterøya, Sandefjord- en typelokalitet for et nytt mineral. Norsk Bergverksmuseum Skrift. 46: 49-56
    Berge, S. A. (2013):Mineralene i Husebyyåsen feltspatbrudd, Vesterøya, Sandefjord. Norsk Bergverksmuseum Skrifter. 50, 93-99
    Engvoldsen,T., Andersen, F., Berge, S. A. & Burvald, I. (1991): Pegmatittmineraler fra Larvik ringkompleks. STEIN 18 (1),15-71
      • Svelvik
    [var: Opal-AN] Larsen, S. & Bergtsrøm, T. (2004): Svelvik- Topas. STEIN 31(4), 11
    [var: Opal-AN] Nordrum, F.S. (2007): Nyfunn av mineraler i Norge 2006-2007. STEIN 34 (2): p.15-16
    [var: Opal-AN] Nordrum, F.S. (2012): Noen funn av mineraler i Norge 2011-2012. Norsk Bergverksmuseum Skrifter. 49, 117-124
    Oman
     
    Pacific Ocean
     
    • Bismarck Sea
    New Data on Minerals (2004): 39: 91-98
    • East Pacific Rise
    Econ Geol (1985) 80:221-249
    • Kermadec-Tonga trench
    A. G. Reyes, C.E.J. DE Ronde, and C. W. R. Soong (2004) a Submarine Magmatic-hydrothermal System at Brothers Volcano, Kermadecs. Proceedings 26th NZ Geothermal Workshop pp 46-52
    • Sea of Japan
      • Honshu Island borderland
    Markov, Y.D., Mozherovskii, A.V., Derkachev, A.N., Barinov, N.N., and Sereda, N.A. (2002): Lithology and Mineral Resources 37(2), 121-129.
    • South California Borderland
    [var: Opal-CT] Hein, J.R., Reid, J.A., Conrad, T.A., Dunham, R.E., Clague, D.A., Schulz, M.S., and Davis, A.S. (2010): USGS Open-File Report 10-1069
    Pakistan
     
    • Gilgit-Baltistan (Northern Areas)
      • Baltistan
        • Skardu District
          • Haramosh Mts.
    [var: Opal-AN] Jose Zendrera specimen
    Panama
     
    • Veraguas Province
    Byington, C.B. and Russell, M.R., 2001, Economic geology and ore controls of the Santa Rosa Mine – An integrated structural analysis approach, Canazas, Veraguas, Republic of Panama: Society of Economic Geologists Special Publication 8, p. 318-329.
    Papua New Guinea
     
    • Milne Bay Province
      • D'Entrecasteaux Islands
        • Fergusson Island (Moratau)
    Province, M. B., & Guinea, P. N. (2004). Technical Report On The Fergusson Property.
    Province, M. B., & Guinea, P. N. (2004). Technical Report On The Fergusson Property.
    • Morobe Province
    Econ Geol (1984) 79:638-655
    • New Ireland Province
      • Lihir Island area
    http://www.portergeo.com.au/tours/pacificgold99/pg99m1.asp#lihir
    Paraguay
     
    • Central
    [var: Opal-AN]
    Peru
     
    • Arequipa Department
      • Caraveli Province
    J.Hyrsl (2012) Gemstones of Peru, p. 56
    Hyrsl & Rosales (2003), Min. Record 34:254
    • Ayacucho Department
    J.Hyrsl (2012) Gemstones of Peru, p. 57
    • Cajamarca Department
      • Cajamarca Province
    Rob Lavinsky specimen
    [var: Opal-CT] Dill, H.G., Bosse, H.-R., Henning, K.-H., Fricke, A., and Ahrendt, H. (1997): Mineralium Deposita 32, 149-163.
    • Ica Department
      • Ica Province
        • Ica
    [var: Opal-AN] Extra Lapis - English No. 10 Opal
      • Pisco Province
    J.Hyrsl (2012) Gemstones of Peru, p. 57
      • Pisco Umay
    • Puno Department
      • Titicaca Lake
    Jacques Valverde self collecting (summer 2007); Jacques Valverde self collecting (summer 2007)
    Poland
     
    • Lower Silesia (Dolnośląskie)
      • Gogołów-Jordanów Massif
    [var: Opal-AN] Szełęg, E., Galuskina, I. 2010: Mineralogy of Lower Silesia, Poland. Acta Mineralogica-Petrographica, Field Guide Series, Vol. 17, 1–15.
        • Sobótka
    [var: Opal-AN] DUBIŃSKA E., 1995: Rodingites of the eastern part of Jordanów-Gogołów serpentynite massif, Lower Silesia, Poland. Can. Mineral., 33, 585-608.GALUSKIN E., SZEŁĘG E., 2003: The first finding of Ag-amalgamates in rodingites (Nasławice, Lower Silesia, Poland). Mineralogical Society of Poland - Special Papers, Vol. 22.
      • Ząbkowice District
    Michael W. Kieron collection
    Alfredo Petrov specimen
    Spangenberg, K., and Müller, M. (1949): Contributions to Mineralogy and Petrology 1(5/6), 560-572.
    Spangenberg, K., and Müller, M. (1949): Die lateritische Zersetzung des Peridotits bei der Bildung der Nickelerzlagerstätte von Frankenstein in Schlesien. Contributions to Mineralogy and Petrology 1(5/6), 560-572
    • Opolskie
    [var: Wood Opal] Kornaga Collection
    • Podkarpackie
      • Błażowa
    [var: Menilite] Personally collected by Zając Piotr in 2013
    [var: Prase Opal] Bauer & Bouska, 1983. Precious & Semi-precious Stones
    Portugal
     
    • Aveiro District
      • Albergaria-a-Velha
        • Branca
    [var: Opal-AN] Marques de Sá, J. & Leal Gomes, C. (2010): Les mines de cuivre et nickel de Palhal et Telhadela, Albergaria-a-Velha, Aveiro, Portugal. Le Règne Minéral, 92, 36-47.
    • Azores District
      • San Miguel Island
    • Beja District
      • Serpa
        • Vale de Vargo
    [var: Opal-AN] pedro alves collection
    Rui Nunes
      • Macedo de Cavaleiros
    Rui Nunes collection
    Rui Nunes collection
    • Castelo Branco District
      • Vila Velha de Rodão
        • Tostão
          • Ingadanais Mines
    [var: Opal-AN] Martins da Pedra collection
    • Évora District
      • Estremoz
        • Glória
    [var: Opal-AN] Rui Nunes collection 2012
    • Guarda District
      • Aguiar da Beira
        • Gradiz
    [var: Opal-AN] Pedro Alves collection
      • Almeida
        • Malpartida
    [var: Opal-AN] Felix Garcia Garcia Mineral Collection
    • Leiria District
    [var: Diatomite] Rui Nunes information
    [var: Diatomite] Rui Nunes
        • São Pedro
    [var: Diatomite] Rui Nunes 2012
    • Portalegre District
    Rui Nunes 2011
    [var: Opal-AN] Rui Nunes 2011
      • Nisa
        • Santana
    Martins da Pedra collection
    • Santarém District
    [var: Diatomite] Rui Nunes 2011
        • Rio Maior
    [var: Diatomite] Rui Nunes 2011
    • Setúbal District
      • Barreiro
        • Palhais
    [var: Diatomite] LNEG - Siorminp
      • Grândola
        • Melides
    [var: Diatomite] LNEG - Siorminp database information
    • Viana do Castelo District
      • Valença do Minho
        • Sanfins
    [var: Opal-AN] Pedro Alves collection; Nuno Afonso collection (XRD-analysed)
    • Viseu District
      • Mangualde
        • Chãs de Tavares
    [var: Opal-AN] Rui Nunes collection
        • Quintela de Azurara
    [var: Opal-AN]
      • Sátão
        • Ferreira de Aves
          • Aldeia Nova
    [var: Opal-AN] Van King
        • Romãs
    [var: Opal-AN] Nuno Afonso collection
    [var: Opal-AN] Pedro Alves collection
        • Vila Longa
    [var: Opal-AN] Pedro Alves collection
    Réunion Island
    [var: Mascareignite] [Hey p438]
    [var: Opal-AN] collection Joachim Esche
    Romania
     
    • Covasna Co.
    Zoltán Csata
    • Hunedoara Co.
      • Deva
    Carpathian Journal of Earth and Environmental Sciences, October 2010, Vol. 5, No. 2, p. 89 - 99
    No reference listed
    [var: Milk Opal] Primics, G. (1886): Das Vorkommen der derben Quarzvarietäten bei Tekerő. Földtani Közlöny, 16, 347-353.
    • Maramureș Co.
      • Șișești Commune
        • Dănești village
    Marinel Kovacs, Alexandrina Fülöp, 2003, Neogene volcanism in Gutâi Mts., (Eastern Carpathians). A Review. Studia Universitatis, Babeș-Bolyai, Geologia, vol.48, 2003, p.3-16
        • Șurdești village
    Jude Radu (2010). An overview of the Oaș and Gutâi Neogene Metallogenetic District. Romanian Journal of Mineral Deposits, Mineral Resources of Carpathians area. 10th-12th September 2010, Baia Mare, Romania. vol 84, p.94-95
    Dana, E., 1892, System of Mineralogy.
    Russia
     
    • Central Region
      • Kurskaya Oblast'
        • Kursk Manet Anomaly group
    Tsekhovskii, Y.G., Lavrushin, V.Y., Kuleshov, V.N., Shchepetova, E.V., Stukalova, I.E., Nosik, L.P., Prokof’ev, V.Y., and Areshin, A.V. (2002): Lithology and Mineral Resources 37(3), 210-227.
      • Moscow Oblast' (Moskovskaya Oblast')
    [var: Opal-AN] Pekin, A. (2011) Minerals of Moscow. Russian Journal of General Chemistry. Jun2011, Vol. 81 Issue 6, p1381-1391.
    Pekin, A. (2011) Minerals of Moscow. Russian Journal of General Chemistry. Jun2011, Vol. 81 Issue 6, p1381-1391.
    Pekin, A. (2011) Minerals of Moscow. Russian Journal of General Chemistry. Jun2011, Vol. 81 Issue 6, p1381-1391.
    • Eastern-Siberian Region
      • Prebaikalia (Pribaikal'e)
        • Irkutskaya Oblast'
    Garrett, Donald E. (1998) Borates. Handbook of Deposits, Processing, Properties, and Use.
      • Sakha Republic (Saha Republic; Yakutia)
    [World of Stones 12:49]
        • Polar Yakutia
          • Alazeya river basin
    Igor Savin data
    • Far-Eastern Region
      • Kamchatka Oblast'
    [Der Aufschluss 1995:4 p163-180]
    [Der Aufschluss 1995:4 p.163-180]
    Karpov, G. A. (1991). Complex mercury-antimony-arsenic mineralization of the Uzon-Waiotapu type in modern hydrothermal systems. International Geology Review, 33(6), 599-611.; Kyle, J. E., Schroeder, P. A., & Wiegel, J. (2007). Microbial silicification in sinters from two terrestrial hot springs in the Uzon Caldera, Kamchatka, Russia. Geomicrobiology Journal, 24(7-8), 627-641.
      • Magadanskaya Oblast'
        • Kolyma River Basin
          • Ducat District
            • Omsukchan
    Filimonova, L.G., and Trubkin, N.V. (2008): Geology of Ore Deposits 50(2), 135-144.
      • Primorskiy Kray
        • Kavalerovo Mining District
    [MinRec 32:8]
    Dobrovol’skaya, M.G., Genkin, A.D., Bortnikov, N.S., and Golovanova, T.I. (2008): Geology of Ore Deposits 50(1), 75-85.
      • Sakhalinskaya Oblast'
        • Kuril Islands
          • Iturup Island
            • Bogatyr' Range
    Znamenskii V.S., Lebedev L.M., Sidorenko G.A. (1970) On molybdenite from middle-cretaceous volcanic rocks of Iturup island (Kuril Islands), - DAN USSR, v.193, N4, pp. 898-901 (in Rus.).
          • Kunashir Island
    L.M. Lebedev data
    • Northern Caucasus Region
      • Stavropol'skiy Kray
        • Pyatigorsk
          • Lermontovskoe U Deposit
            • Beshtau Mt.
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
          • Lovozero Massif
            • Alluaiv Mt
    Pavel M. Kartashov data
    Pavel M. Kartashov analytical data (2013)
            • Kedykverpakhk Mt
    Mineralogical Record: 36(4): 397-416.
            • Seidozero Lake
    Yakovenchuk, V.N., Pakhomovsky, Ya.A., Men’shikov, Yu.P., Mikhailova, J.A., and Ivanyuk, G.Yu. (2007): Canadian Mineralogist 45, 451-456.
    • Povolzhsky Region
      • Samaraskaya Oblast' (Samara Oblast')
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    • Urals Region
      • Middle Urals
        • Sverdlovskaya Oblast'
          • Ekaterinburg (Sverdlovsk)
            • Berezovskii (Berezovskii Zavod)
      • Southern Urals
        • Chelyabinsk Oblast'
    Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
          • Magnitogorsk
            • Sakhara District (Sakharinskii)
              • Sakhara massif
    Mikhailov, B.M. (2000): Lithology and Mineral Resources 35(4), 351-364.
          • Plast
            • Kochkar' District
              • Svetlyi
    Pavel M. Kartashov analytical data
        • Orenburgskaya Oblast'
          • Orsk
            • Khalilovskii District
              • Khabarninskii massif
    Sharkov, A.A. (2009): Lithology and Mineral Resources 44(1), 19-35.
              • Khalilovskii (Khalilova) massif
    Mikhailov, B.M. (2000): Lithology and Mineral Resources 35(4), 351-364.
          • Svetlyi
            • Buruktal District
    [var: Prase Opal] Mikhailov, B.M. (2000): Lithology and Mineral Resources 35(4), 351-364.
    Mikhailov, B.M. (2000): Lithology and Mineral Resources 35(4), 351-364.
    • Western-Siberian Region
    [Mineralien Welt 6/92:62]
    Rwanda
     
    • Western Province
      • Gatumba District
    Daltry, V.D.C. and O. von Knorring (1998) Type-Mineralogy of Rwanda with Particular Reference to the Buranga Pegmatite. Geologica Belgica 1:1-9
    Saudi Arabia
     
    • Mintaqah Makkah
    Saudi Geological Survey Open-File Report SGS-OF-2004-12, 68 p.
    Slovakia
     
    • Banská Bystrica Region
      • Banská Bystrica Co.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
        • Banská Bystrica (Neusohl)
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
    Koděra, M. a kol.: Topografická mineralogie Slovenska. Sv. 3 Sed-Ž, Bratislava, Veda 1990, s. 1273-5.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
        • Hrochoť
    [var: Milk Opal] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
        • Ľubietová (Libetbánya; Libethen)
    [var: Opal-AN] Mesiarkinová M. & Ozdín D., 2009: Study of hydrothermal SiO2 mineralization on the locality Ľubietová - Jamešná (Slovakia). Mitt. Österreich. Mineralog. Gesellschaft, 155, p. 101.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
        • Poniky
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Ďuďa R., 1996: Slovenské opály. Minerál,Brno, IV, 4, 254 - 258
    [var: Opal-AN] Pauliš,P.,Ďuďa,R.,2002: Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
      • Banská Štiavnica Co.
        • Banská Belá
    Koděra M., Andrusovová-Vlčeková G., Belešová O., Briatková D., Dávidová Š., Fejdiová V., Hurai V., Chovan M., Nelišerová E., Ženiš P., 1986-1990: Topografická mineralógia Slovenska. I-III. Veda, Bratislava, 1592 p. (in Slovak)
    [var: Opal-AN]
    Lexa, J., Štohl, J., and Konečný, V. (1999): Mineralium Deposita 34, 639-654.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Lexa, J., Štohl, J., and Konečný, V. (1999): Mineralium Deposita 34, 639-654.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
      • Brezno Co.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
      • Detva Co.
    [var: Opal-AN] Koděra, M., Andrusovová-Vlčeková, G., Belešová, O., Briatková, D., Dávidová, Š., Fejdiová, V., Hurai, V., Chovan, M., Nelišerová, E., Ženiš, P. (1986-1990): Topografická mineralógia Slovenska. I-III. Veda, Bratislava, 1592 p.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Ivanov M. (1979): Genéza mangánových rudných výskytov medzi Detvou a Hriňovou. Geol. Práce, Správy, 73,173-186.
    Rojkovičová,Ľ., 1982: Rudná mineralizácia v Javorí. Min.Slovaca, 14,5,461 – 470
      • Krupina Co.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
        • Hontianske Nemce
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
      • Lučenec Co.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
      • Revúca Co.
        • Sirk
    Grecula,P. et al., 1995: Ložiska nerastných surovín Slovenského rudohoria. Zväz.1, Bratislava, 834 s
      • Veľký Krtíš Co.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
      • Žarnovica Co.
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
        • Nová Baňa
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
        • Žarnovica
    [var: Wax Opal] Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
      • Žiar nad Hronom Co.
        • Banská Štiavnica Mining District
          • Vyhne
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Wood Opal] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Ďuďa R., 1993 : Die mineralien der Gold und Silber - lagersttäte von Kremnitz ( Kremnica) in der Slowakei. Mineralien Welt /Haltern,Nemecko/,5, s. 20 - 32
    Daniel Ozdín collection
    [var: Wood Opal] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Pauliš,P.,Ďuďa,R.,2002: Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
      • Zvolen Co.
        • Lešť
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    • Bratislava Region
      • Pezinok Co.
        • Pezinok
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [MinRec 31:153-162]
    • Košice Region
      • Gelnica Co.
        • Gelnica (Göllnitz)
    Pauliš P., Ďuďa R., 2002: Nejzajimavejší mineralogická nalezište Slovenska. Kuttna, Kutná Hora, 134p.
      • Košice Co.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Pauliš P., Ďuďa R., 2002: Nejzajimavejší mineralogická nalezište Slovenska. Kuttna, Kutná Hora, 134p.
      • Michalovce Co.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
      • Rožňava Co.
    [var: Opal-AN] Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
    Ozdín D. & Števko M., 2010: Unikátny výskyt achátov v serpentinizovaných peridotitoch v Dobšinej. Minerál, 18, 4, 331-335.
        • Kečovo
    Cílek V., 1999: Mineralogické výskumy v jeskyni Domica. Aragonit, 4, 9 – 11
        • Ochtiná (Achten)
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
      • Sobrance Co.
    [var: Opal-AN] Bacsó,Z.,Ďuďa,R.,1988: Metalogenéza a rudné formácie rudného poľa Remetské Hámre. Min.Slovaca,Bratislava, 3, 193-220p
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
      • Spišská Nová Ves Co.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
      • Trebišov Co.
    [var: Opal-AN] Pauliš P., Ďuďa R., 2002: Nejzajimavejší mineralogická nalezište Slovenska. Kuttna, Kutná Hora, 134p.
    [var: Opal-AN] Pauliš P., Ďuďa R., 2002: Nejzajimavejší mineralogická nalezište Slovenska. Kuttna, Kutná Hora, 134p.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Kaličiak, M., Ďuďa, R., 1996: Geolgický vývoj, stavba a metalogenéza neovulkanitov na Východnom Slovensku. Manuskript, Archív Geofond, Bratislava, 83p
    • Nitra Region
      • Levice Co.
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Wood Opal] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Albert Russ specimens
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
        • Veľký Ďur
    [var: Wood Opal] Wood Opals From Velky Dur,Mineral no.3,2006,Illasova and Turnovec
    • Prešov Region
      • Kežmarok Co.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
      • Poprad Co.
        • Hôrka
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
        • Poprad
    Pauliš,P.,Ďuďa,R.,2002: Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
      • Prešov Co.
        • Červenica
    [var: Onyx Opal] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    [var: Opal-AN] Personally collected by S.Šimko in 1994
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
        • Vyšná Šebastová
    Ďuďa,R., et al., 1981: Mineralógia severnej časti Slanských vrchov. Min.Slovaca, Monografia 2, 98s
    [var: Opal-AN] Duda et. all.,1981:Minerály severnej časti Slanských vrchov. Min.Slovca,Monografia 2,Bratislava, 98 p
      • Snina Co.
    [var: Opal-AN] Pauliš,P.,Ďuďa,R.,2002: Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
      • Stará Ľubovňa Co.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
      • Vranov nad Topľou Co.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
        • Juskova Voľa
    Duda et all.,:Mineralógia severnej časti Slanských vrchov. Min.Slovaca,Monografia 2,Bratislava, 98 p
    [var: Opal-AN] Ďuďa,R., et al., 1981: Mineralógia severnej časti Slanských vrchov. Min.Slovaca, Monografia 2, 98s
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    • Trenčín Region
      • Prievidza Co.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    [var: Opal-AN] Slavomír Šimko
    [var: Wood Opal] S.Šimko
    Gabriel Gajarsky specimen
    • Trnava Region
      • Trnava Co.
        • Smolenice
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
    • Žilina Region
      • Dolný Kubín Co.
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
      • Liptovský Mikuláš Co.
        • Malužiná
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
        • Partizánska Lupča
    [var: Opal-AN] Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
      • Turčianske Teplice Co.
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
    Somaliland
     
    Wolfgang Hampel specimen
    • Jodha
    [Precious Opal] Journal of Gemmology, 28:81-84 (2002).
    South Africa
     
    • KwaZulu-Natal Province
    Minerals of South Africa
    • Limpopo Province
      • Bushveld Complex
        • Waterberg District
          • Naboomspruit (Mookgophong)
    [var: Opal-AN] Wolfgang R. Windisch personal list.
      • Vhembe District
        • Soutpansberg (Zoutpansberg)
    Minerals of South Africa
    • Mpumalanga Province
      • Ehlanzeni District
        • Barberton
          • Bon Accord
    Am Min 54 (1969), 1204-1208
        • Nelspruit
    Martini, J.E.J. et al (1997), "Mbobo Mkulu Cave, South Africa", in "Cave Minerals of the World" (1997)
    • North West Province
      • Western Bushveld Complex
        • Pilanesberg Alkaline Complex
    Minerals of South Africa
    • Northern Cape Province
      • Kalahari manganese field
        • Black Rock
    Am Min 53:495
        • Hotazel
    Von Bezing, K. L. et al. (1991) The Kalahari manganese field: An Update, Mineralogical Record 22(4) pp 289.
      • Namakwa District (Namaqualand)
        • Henkries
    [var: Diatomite] Eriksson, P.G. (1997): Mineralium Deposita 32, 419-422.
      • Orange River
    Minerals of South Africa
    Minerals of South Africa
    South Korea
     
    • Gangwon-do (Kangwon-do; Gang'weondo)
      • Chongson-gun
        • Tong-myon
          • Hwaam-ni
    Kinosaki, Y. (1941) Journal of the Mineralogical Society of Korea, 24, 5.
    Spain
     
    • Andalusia
      • Almería
        • Bayarque
    Propuestas para explotación de mineral de mercurio en la Península Ibérica. Datos complementarios para la investigación en el S.E.", ITGE (Madrid, 1968)
        • Cuevas del Almanzora (Cuevas de Vera)
    Josep Sanchez LaFuente (INTAN) specimens
        • Níjar
    Joaquim Mollfulleda, Minerales, Omega, 1996
      • Granada
        • Galera
    [var: Menilite] FMF Forum
    • Aragón
      • Teruel
        • Loscos
    Calvo, M. (2008) Minerales de Aragón. Prames (Zaragoza) 463 pages
      • Zaragoza
        • Morés
          • Purroy
    Calvo, M. (2008) Minerales de Aragón. Prames (Zaragoza) 463 pp
    • Canary Islands
      • Las Palmas Province
    [Precious Opal] Extra Lapis - English No. 10 Opal
          • Agaete
    María Jesús Mediavilla collection
          • Anden Verde
    Mullis, J., and Sigl, F. (1982) Die Entstehungsgeschichte von Opal, Chalcedon und Quarz von Gran Canaria. Schweizer Strahler, 6,155-176.
          • Las Palmas de Gran Canaria
    [var: Opal-AN] Alex Hansen Machín (2009). Volcanología y geomorfología de la etapa de rejuvenecimiento plio-pleistocena de Gran Canaria (Islas Canarias). Tesis doctoral. Personally collected in January 2013
    [var: Opal-AN] Graetsch, H. and I. Topalovic-Dierdorf: MAS NMR spectra of hyalite from Gran Canaria. Chemie der Erde. 56: (1996).387-391. 770
    - Ternes, B. (1995): Fundstellen im Südwesten Gran Canarias. Lapis 20 (1), 57-59 (in German).
          • Tasarte
    [var: Opal-AN] Zeolite collcetion of Volker Betz
      • Santa Cruz de Tenerife Province
        • Tenerife
          • Santa Cruz de Tenerife
            • Anaga Mts.
    Journal of Non-Crystalline Solids 323 (2003) 27–33
    • Castile-La Mancha
      • Albacete
    [var: Menilite] Juan Miguel Casanova Honrubia information
        • Hellín
    INTAN (Barcelona) and Stefan Schorn specimens
    [var: Menilite] MTI Mineralogía Topográfica Ibérica, 2009
      • Ciudad Real
    [var: Opal-AN] Martins da Pedra collection
          • Bolaños de Calatrava
    JRGL collection
    • Castile and Leon
      • Zamora
    Jordi Fabre
    • Catalonia
      • Barcelona
        • Barcelonès
          • Barcelona city
    Carles Curto Mila collection
        • Maresme
          • Tordera
    [var: Opal-AN] Marc C collection
        • Vallès Occidental-Baix Llobregat
          • Sant Cugat del Vallès-El Papiol
        • Vallès Occidental
          • Montcada i Reixac
    Mineralogistes de Catalunya (1997), VII (1): 34-55
        • Vallès Oriental
          • Aiguafreda
    Bareche, E. (2005) "Els minerals de Catalunya. Segle XX" Grup Mineralògic Català, Barcelona, 269 pages
          • Sant Fost de Campsentelles
    Laura Palacios Pérez, Minerals i roques, Pòrtic Natura, 2003
      • Girona (Gerona)
        • Alt Empordà
    Joaquim Mollfulleda, Minerales, Omega, 1996
        • La Selva
          • Caldes de Malavella
    Laura Palacios Pérez, Minerals i roques, Pòrtic Natura, 2003
          • Maçanet de la Selva
    Martí Rafel - Dr. Joan Viñals;
          • Osor
          • Sils
            • Massabè
    Joaquim Mollfulleda, Minerales, Omega, 1996
      • Tarragona
        • Priorat
          • Bellmunt del Priorat
    Joan Abella i Creus (2008): Minerals I Mines De La Conca De Bellmunt Del Priorat.
    • Galicia
      • A Coruña (La Coruña)
        • Santa Comba
    Carlos J. Rodríguez
      • Pontevedra
        • Ponteareas
    Calvo, M., Viñals, J. and Vila, F. (2009) Mineralogy of the pegmatites and miarolitic cavities in the granitic batholit of Porriño, Pontevedra, galicia, Spain. Mineral Up, (2009-1), 6-23
        • Porriño
    Calvo, M., Viñals, J. and Vila, F. (2009) Mineralogy of the pegmatites and miarolitic cavities in the granitic batholit of Porriño, Pontevedra, galicia, Spain. Mineral Up, (2009-1), 6-23
    • Madrid
    Garcia G., Gonzalez C., Bueno A. (2004) - Cadalso de los Vidrios (Madrid), Bocamina, n° 14, pp: 12-46.
      • Fuenlabrada
    Geominero Museum Collection
    - González del Tánago, J., Lozano, R.P. and González del Tánago Chanrai, J. Plutón de La Cabrera. Pegmatitas graníticas y alteraciones hidrotermales. Bocamina, 2008, (21), pags. 15-85.
    Tanago, J. G., Lozano, P. L., Larios, A. , La Iglesia, A. (2012) Stokesite crystals from La Cabrera, Madrid, Spain. Mineralogical Record 43:499-508
      • Valdemanco
    - González del Tánago, J., Lozano, R.P. and González del Tánago Chanrai, J. Plutón de La Cabrera. Pegmatitas graníticas y alteraciones hidrotermales. Bocamina, 2008, (21), pags. 15-85
    Collection of the Geominero Museum of Madrid
    - González del Tánago, J., Lozano, R.P. and González del Tánago Chanrai, J. Plutón de La Cabrera. Pegmatitas graníticas y alteraciones hidrotermales. Bocamina, 2008, (21), pags. 15-85
    - González del Tánago, J., Lozano, R.P. and González del Tánago Chanrai, J. Plutón de La Cabrera. Pegmatitas graníticas y alteraciones hidrotermales. Bocamina, 2008, (21), pags. 15-85
    • Murcia
      • Cartagena
        • La Aljorra
    Sevillano, G. C., Viñals,J., Rebollar, M.C (2009): Minerales de las Vesículas de las Rocas Lamproíticas del afloramiento de La Aljorra (Murcia). Macla (11), 43-44
        • Sierra Minera de Cartagena-La Unión
          • Llano del Beal
    FMF Forum
      • La Unión
        • Sierra Minera de Cartagena-La Unión
          • La Fortuna
    [var: Opal-AN]
          • La Peraleja
    [var: Opal-AN]
          • Sancti Spiritu
    FMF Forum
    • Valencian Community
      • Valencia
        • Barxeta
    Casanova Honrubia, Juan Miguel & Canseco Caballé, Manuel, 2002, Minerales de la Comunidad Valenciana : 237 p. Ed. Caja de Ahorros del Mediterráneo. Alicante
    Sweden
     
    • Lappland
    No reference listed
    • Skåne
      • Kristianstad
        • Osby
    Swedish Nat.Museum
    • Värmland
      • Filipstad
    Rocks & Min.: 63:456; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
    • Västmanland
      • Nora
        • Timansberg
    Kjell Gatedal
    Switzerland
     
    • Bern
      • Hasli Valley
        • Grimsel area
          • Oberaar lake area
            • Triebten lake (Trübten lake)
    [var: Opal-AN] Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 291.
    [var: Opal-AN] Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 291.
    • Grischun (Grisons; Graubünden)
      • Albula Valley
        • Oberhalbstein (Surses; Sursass)
          • Tinizong (Tinzen)
    [var: Opal-AN]
      • Medel Valley
    [var: Opal-AN] Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 291.
    • Ticino (Tessin)
      • Leventina
        • Fiesso
    [var: Opal-AN] Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 291.
      • Lugano lake
        • Carona
    [var: Opal-AN] Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 291.
      • Riviera
        • Bellinzona
    [var: Opal-AN] Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 58
    • Vaud (Waadt)
      • Lavey-les-Bains
    [var: Opal-AN] Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p.
    • Wallis (Valais)
      • Binn Valley
        • Chummibort
    [var: Opal-AN] Cuchet, S., van der Burgt, A. und Meisser, N. (2005): Chummibort, eine neue Fundstelle für Arsenmineralien im Binntal. Schweizer Strahler, Nr. 2, 19-29. (in German/French)
        • Kriegalp Valley (Chriegalp Valley)
    [var: Opal-AN]
      • Martigny
        • Mont Chemin
    [var: Opal-AN]
    Tanzania
     
    • Arusha Region
      • Dumbawanga District
    http://www.ganoksin.com/borisat/nenam/tanzania-mines.htm
    • Dodoma Region
    Schmetzer, K., Berdesinski, W. Krupp, H. (1976) Grüner Opal aus Tansania. Aufschluss: 27, 381-384.
    • Tanga Region
    Thailand
     
    • Nakhon Ratchasima Province (Khorat Province)
      • Nakhon Ratchasima District
    [var: Opal-Agate] C. Lemanski, Jr. (visited, collected & photographed).
    Togo
     
    • Plateaux Region
      • Haho Prefecture
        • Mont Haïto
          • Kpoté
    Wolfgang Hampel (2013)
    Tonga
     
    Schwarz-Schampera, U.,et al. (2007) Cruise Report SONNE 192/2, MANGO. Marine Geoscientific Research on Input and Output in the Tonga-Kermadec Subduction Zone
    Turkey
     
    • Aegean Region
      • Izmir Province
    [var: Fire Opal] KARACIK, ZEKİYE; GENÇ, S. CAN; ESENLİ, FAHRİ; GÖLLER, GÜLTEKIN. (2011) he Gümüldür Fire Opal: Mode of Occurrence and Mineralogical Aspects. Turkish Journal of Earth Sciences. Jan/Feb2011, Vol. 20 Issue 1, p99-114.
      • Kütahya Province
        • Murat Dagi
    Econ Geol (1989)84:780-787
    Econ Geol (1989)84:780-787
    Econ Geol (1989)84:780-787
        • Pazarla
    [var: Opal-CT] Mutlu, H., Sariiz, K., and Kadir, S. (2005): Ore Geology Reviews 26, 39-50.
    Esenli, F., Kumbasar, I., Eren, R. H., & Uz, B. (2001). Characteristics of opals from Simav, Turkey. Neues Jahrbuch fur Mineralogie-Monatshefte, (3), 97-113.
    • Central Anatolia Region
      • Ankara Province
    [var: Opal-CT] Temel, A., Akdag, N., and Varol, E. (2010): Goldschmidt Conference Abstracts 2010.
      • Eskişehir Province
    Ferdinando Giovine specimen
    • Eastern Anatolia Region
      • Erzurum Province
        • Kop Daglari
    Mineralien Welt 2001 02 p.53
    • Marmara Region
      • Balikesir Province
        • Bigadiç
    CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27
          • Faraşköy (Faraş)
    CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27
        • Mumcu
    Oygür, V. (1997). Anatomy of an epithermal mineralization: Mumcu (Balikesir-Sindirgi), Inner Western Anatolia, Turkey. Mineral Research Exploration Bulletin, 119, 29-39.
        • Susurluk
          • Sultançayırı (Sultan Tschair)
    [var: Opal-CT] CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9:1-27.
      • Bursa Province
        • Mustafa Kemalpafla
    CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27
    U.S. Virgin Islands
     
    • St Croix
    Am Min 50:752
    UK
     
    • England
      • Cornwall
        • Callington District
          • Calstock
            • Gunnislake
    Weiss, S., Green, D.H., Hooper, J.J. & Elton, N. (2007): Erzgänge und "alpine " klüfte: Die Mineralien des Hingston Quarry, Calstock, Cornwall. LAPIS 32 (11), 13-25
        • Camborne - Redruth - St Day District
          • Camborne
            • North Roskear
    Hall, T.M. (1868): Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
          • Carharrack
            • Wheal Damsel United Mines
    Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 191; Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
          • Gwennap
            • St Day United Mines (Poldice Mines)
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
          • Redruth
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
        • Lizard Peninsula
          • Mawgan-in-Meneage
    No reference listed
        • Mount's Bay District
    [var: Opal-Jasper] [Specimen in the Natural History Museum, London]
        • St Austell District
          • Lostwithiel
    Henwood, W.J. (1843): Transactions of the Royal Geological Society of Cornwall 5, 1-386
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
          • St Columb Major
            • Trebudannon
    Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 191; Hall, T.M. (1868): Edward Stanford (London), 168 pp.; Collins, J.H. (1871): A Handbook to the Mineralogy of Cornwall and Devon. D. Bradford Barton Ltd. (Truro, UK), 108 pp.
          • St Dennis
            • Hendra Downs
    Courtenay Smale, pers com.
    P Trebilcock collection,ex M Trudgeon clay worker collection.
    Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
          • St Enoder
            • Fraddon
    No reference listed
          • St Mewan
            • Longstone Downs
    P, D, Trebilcock Collection.
            • Trewoon
    P, Trebilcock. Collection
          • St Stephen-in-Brannel
            • Foxhole
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
          • Treverbyn
            • Bugle
    No reference listed
            • Carluddon
              • Carclaze China Clay Pit (Baal China Clay Pit)
    Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
            • Stenalees
    Barstow, R. W. (1982). Variscite from Hensbarrow china clay works, St. Austell, Cornwall. Mineralogical magazine, 46, 512.
        • St Erth - Gwithian Area
          • Gwinear
            • Copperhouse
              • Rosewarne and Herland United Mines (Rosewarne and Herland Mine; incl. Wheal Fancy; Wheal Pleasure)
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
            • Halancoose
    Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
            • Rosewarne United Mines
    Reid, C., Flett, J.S., Wilkinson, B.S.N., Dixon, E.E.L., Pollard, W., and MacAlister, D.A. (1907): The Geology of the Land's End District. HMSO Publications (London), p. 114.
          • Phillack
            • Great Wheal Alfred (Alfred Consols)
    Michael W. Kieron collection
        • St Ives District
          • St Ives
    [var: Isopyre] Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), pp. 108.
        • St Just District
          • St Just
            • Botallack
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp.
    Carne, J. (1822): Transactions of the Royal Geological Society of Cornwall 2, 290-358
            • Pendeen
    Reid, C., Flett, J.S., Wilkinson, B.S.N., Dixon, E.E.L., Pollard, W., and MacAlister, D.A. (1907): The Geology of the Land's End District. HMSO Publications (London), p. 101.
              • Geevor Mine (North Levant Mine)
    Carne, J. (1822): Transactions of the Royal Geological Society of Cornwall 2, 290-358
            • Trewellard
    Carne, J. (1822): Transactions of the Royal Geological Society of Cornwall 2, 290-358
      • Cumbria
        • South Eastern Region (Westmorland)
          • Kentmere
    BMS Database
      • Derbyshire
    Ford, T., A. Sarjeant & M. Smith (1993): The minerals of the Peak district of Derbyshire. UK Jour. Mines & Minerals 13, 16-55.
        • Eyam
    Ford, T., A. Sarjeant & M. Smith (1993): The minerals of the Peak district of Derbyshire. UK Jour. Mines & Minerals 13, 16-55.
      • Devon
        • Dartmoor & Teign Valley District
          • Dartmoor Forest
            • Hexworthy
    Collection Of Bernie Millington
    Bernie Millington collection
    Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.
        • Okehampton area (Northern Dartmoor)
          • Belstone
    Solly, R.H. (1888): Mineralogical Magazine 6, 202-211
    • Northern Ireland
      • Co. Down
        • Mourne Mts
    [var: Opal-AN] Trevor Boyd Collection
    • Scotland
      • Fife
        • Raith
    James Phemister and A. G. MacGregor (1942) Note on Datolite and Other Minerals in a Contact-Altered Limestone at Chapel Quarry, Near Kirkcaldy, Fife. Mineralogical Magazine 26:275-282.
      • North West Highlands (Inverness-shire)
        • Isle of Skye
          • Minginish
            • Carbost
              • Talisker
    No reference listed
          • Trotternish
            • Portree
    Ukraine
     
    • Crimea Oblast'
      • Crimea peninsula
    Volodymyr Manyuk (2008) The Problem Of Creation Of Network National Geoparks In Ukraine. in Proceeding 33 th International Geological Congress
      • Simferopol area
        • Petropavlovka Village area
    A. Tischenko. Minerals of the Crimea - World of stones, 1996, #9, p. 9-18
    • Zhytomyr Oblast' (Zhitomir Oblast')
    Lyckberg, P., Chornousenko, V. & Wilson, W. E. (2009): Volodarsk-Volynski, Zhitomir Oblast, Ukraine. Mineralogical Record, 40, 473-506.; Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
    USA
     
    • Alabama
      • Clay Co.
    [var: Opal-AN] Mineralogy of Alabama Geol Surv Ala. Bull 120
      • Shelby Co.
        • Alabaster
    Rocks & Min. (2007) 82:235-236
    • Alaska
      • Aleutians East Borough
        • Alaska Peninsula District
    U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
    U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
      • Nome Borough
        • Kougarok District
    [var: Diatomite] U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
      • Southeast Fairbanks Borough
        • Delta River District
    U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
        • Valdez Creek District
    U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
      • Valdez-Cordova Borough
        • Chistochina District
    U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
    U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
    • Arizona
      • Apache Co.
        • Navajo Indian Reservation
          • Monument Valley
            • Monument No. 2 channel
    Reinhardt, E.V. (1951), Reconnaissance trip to Monument Valley, USAEL, RMO o. 624; Ridge, J.D. (1968), Ore deposits of the United States 1933-1967, Vol. 1: 799-803.
    [var: Opal-AN] Witkind, I.J. & R.E. Thaden (1963), Geology and uranium-vanadium deposits of the Monument Valley area, Apache and Navajo Cos., AZ: 123.
      • Cochise Co.
        • Curtis
    [var: Diatomite] Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87; MRDS database Dep. ID file #10060237, MRDS ID #TC10206.
        • Dos Cabezas Mts
          • Dos Cabezas (Two Heads) District
            • Dos Cabezas
    Rolf Luetcke
        • Dragoon Mts
          • Middle Pass District
            • Gordon Camp
    Rolf Luetcke
    Rolf Luetcke
          • Turquoise District (Courtland-Gleeson District)
    Rolf Luetcke
        • Huachuca Mts
          • Hartford District (Huachuca Mountains District)
            • Carr Canyon
    [var: Opal-AN] Eckhard D. Stuart collection
    Personally collected by bob Jackson, 2011
        • Little Dragoon Mts
          • Cochise District
            • Dragoon
    Rolf Luetcke
        • Post Ranch
    [var: Diatomite] MRDS database Dep. ID file #10060238, MRDS ID #TC10207.
    Rolf Luetcke
        • Tombstone Hills
          • Tombstone District
            • Contention-Grand Central Mine group
    [var: Opal-AN] Dana 6:1093.
    [var: Opal-AN] Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 315; Williams, S.A. (1979), Girdite, oboyerite, fairbankite, and winstanleyite, four new tellurium minerals from Tombstone, AZ, Min.Mag.: 43: 453-457; Rocks & Min.:57:12.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 171; Williams, S.A. (1981a), Choloalite, CuPb(TeO3)2·H2O, a new mineral, Min.Mag.: 44: 55-57.
    Anthony, J.W., et al (1995), Mineralogy of AZ, 3rd.ed.: 211, 212-213, 356.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Butler, B.S., et al (1938b), Geology and ore deposits of the Tombstone district, AZ, AZ Bur. Mines Bull. 143; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87.
        • Yellowstone District
    Rolf Luetcke
      • Coconino Co.
        • Cameron District
    Bollin, E. M., & Kerr, P. F. (1958). Uranium mineralization near Cameron, Arizona. In Guidebook of the Black Mesa Basin, northern Arizona: New Mexico Geological Society, 9th Field Conference Society Guidebook (Vol. 9, pp. 161-168).
        • San Franciscan volcanic field (San Francisco Peaks; San Francisco Mts)
    Hanson, S. L., A. U. Fastner, W. B. Simmons (2008) Mineralogy of the Fumerole deposits at Sunset Crater Volcano National Monument, Northern Arizona. Rocks & Mnerals 83:6 pp 534-544.
      • Gila Co.
        • Globe-Miami District
          • Globe Hills District
            • Globe Hills
              • Buffalo Gulch
    MRDS database Dep. ID #10109030, MRDS ID #M002898.
          • Miami-Inspiration District
            • Inspiration
              • Miami-Inspiration deposit
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Sun, M.S. (1963), The nature of chrysocolla from Inspiration mine, AZ, Am.Min.: 48: 649-658.
    [var: Opal-AN] Anthony, J.W., et al (1995), Mineralogy of AZ, 3rd.ed.: 193; Granger, H.C. & R.B. Raup (1969), Geology of uranium deposits in the Dripping Spring quartzite, Gila Co., AZ, USGS PP 595.
        • Sierra Ancha Mts
          • Sierra Ancha District
            • Asbestos Point (Asbestos Peak) area
              • Warm Spring Canyon
    [var: Opal-AN] Granger, H.C. & R.B. Raup (1969), Geology of uranium deposits in the Dripping Spring quartzite, Gila Co., AZ, USGS PP 595; Granger, H.C. & R.B. Raup (1959), Uranium deposits in the Dripping Spring Quartzite, Gila Co., AZ, USGS Bull. 1046-P: 457-459.
            • Aztec Lodge area
              • Workman Creek area
    [var: Opal-AN] Granger, H.C. & R.B. Raup (1959), Uranium Deposits in the Dripping Spring Quartzite, Gila Co., AZ, USGS Bull. 1046-P: 469-470.
    [var: Opal-AN] Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 297; Granger, H.C. & R.B. Raup (1969), Geology of uranium deposits in the Dripping Spring quartzite, Gila Co., AZ, USGS PP 595.
            • Rose Creek Lodge area
              • Workman Creek
    [var: Opal-AN] Granger, H.C. & Raup (1959), Uranium deposits in the Dripping Spring Quartzite, Gila Co., AZ, USGS Bull. 1046-P: 467-468.
            • Workman Creek Valley
              • Rose Creek Lodge area
    [var: Opal-AN] Granger, H.C. & R.B. Raup (1959), Uranium deposits in Dripping Spring Quartzite, Gila Co., AZ, USGS Bull. 1046-P: 446, 464-466.
      • Graham Co.
        • Gila Mts
          • Lone Star District (Safford District; Dos Pobres District)
            • Gila Valley
              • Fort Thomas
    [var: Diatomite] MRDS database Dep. ID #10060232.
            • Solomon Pass
    [var: Diatomite] Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87; MRDS database Dep. ID #10060233.
        • Whitlock Mts
          • Slick Rock Wash
    [var: Diatomite] MRDS database Dep. ID #10210079.
      • Greenlee Co.
        • Ash Peak District (Twin Peaks District)
          • Duncan
    P Cristofono collection
        • Shannon Mts
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Reber, L.E., Jr. (1916), The mineralization at Clifton-Morenci, Econ.Geol.: 11: 528-573.
            • Morenci
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Moolick, R.T. & J.J. Durek (1966), The Morenci district, in S.R. Titley and C.L. Hicks (editors), Geology of the porphyry copper deposits, southwestern North America, Univ. AZ Press, Tucson: 221-231.
        • Steeple Rock District (Duncan District)
          • Duncan area Diatomite deposits
    [var: Diatomite] MRDS database Dep. ID file #10161567.
      • La Paz Co.
        • Buckskin Mts
    [var: Opal-AN] The-Vug.com Collecting Minerals of La Paz County DVD
    [var: Opal-AN] P Cristofono collection
          • Santa Maria District (Planet District; Swansea District; Bill Williams District)
    [var: Opal-AN] The-Vug.com Collecting Minerals of La Paz County DVD
        • Trigo Mts
          • Silver District
    [var: Opal-AN] Dana 6: 1094.
      • Maricopa Co.
        • Saddle Mountain
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Galbaith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87..
        • Vulture Mts
          • Vulture District
    [Precious Opal] Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87.
      • Mohave Co.
        • Aquarius Cliffs area
    Granger, H.C. & Raup, R.B. (1962), USGS Bull. 1147A, Recon. Study of Uranium Deps. in AZ: A16-A18.
        • Artillery Mts
          • Maggie Canyon
    Mouat, M.M. (1962) Manganese oxides from the Artillery Mountains area, Arizona. American Mineralogist, 47, 744-757.
    [var: Opal-AN] Galbraith, F.W. & Brennan (1959), Minerals of AZ: 87.
          • Oatman District (San Francisco District; Union Pass District)
            • Union Pass District (Katherine District)
    [var: Fire Opal] Galbraith, F.W. & Brennan (1959), Minerals of AZ: 87.
        • Lost Basin Mts (Lost Basin Range)
          • Lost Basin District
    Theodore, T.G., et al (1987), USGS PP 1361: 148-149 (Table 11).
      • Pima Co.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Sun, M.S. (1961), Differential thermal analysis of shattuckite, Am.Min.: 46: 67-77.
          • Little Ajo Mts
            • Ajo
    Thomas, W.J. & R.B. Gibbs (1983), Famous mineral localities: The New Cornelia mine, Ajo, AZ, Min.Rec.: 14: 283-298; Gilluly, J. (1946), The Ajo mining district, Arizona, USGS PP 209: 89.
        • Santa Rita Mts
          • Helvetia-Rosemont District
    [var: Diatomite] MRDS database Dep. ID file #10060227, MRDS ID #TC10194.
            • Helvetia
              • Monument Mountain
    Rolf Luetcke
              • Tiptop Mountain
                • Tiptop Mine group (Tiptop Camp prospects/mines)
    [var: Opal-AN] P Cristofono collection, 2008
        • Sierrita Mts
          • Pima District (Olive District; Mineral Hill District; Twin Buttes District)
            • San Xavier
    [var: Opal-AN] No reference listed
            • Stevens Mountain
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193.
        • Silver Bell Mts
          • Silver Bell District
            • Mineral Mountain
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Kerr, P.F. (1951), Alteration features at Silverbell, AZ, Geol. Soc. Amer. Bull.: 62: 451-480; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87.
      • Pinal Co.
        • Mineral Mountain District
          • Superior area
            • Reymert Canyon
    [var: Opal-AN] Collected by C. Lemanski, Jr.
        • Superior District
          • Superior
    Univ. AZ Bull. 41 (1916-17), Mineralogy of useful Minerals in AZ: 48; Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193..
      • Santa Cruz Co.
    [Precious Opal] Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193.
        • Oro Blanco Mts
          • Oro Blanco District (Ruby District)
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193.
        • Redrock District
    [var: Diatomite] Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
          • Huachuca Mountains Northwestern foothills
    [var: Diatomite] Peirce, H.Wesley (1969), Diatomite, in USGS & Arizona Bureau of Mines & U.S. Bureau of Reclamation, Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871): 337-342.
          • Redrock Canyon
            • East of Red Rock Canyon
    [Precious Opal] Lewis, W. Scott (1942), Gem collecting in California: Hobbies: 47: 116-117; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Santa Cruz village area
    [var: Opal-AN] Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87.
        • Santa Rita Mts
          • Tyndall District
            • Salero area
              • Grosvenor Hills
    [var: Opal-AN] Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 361.
      • Yavapai Co.
        • Bradshaw Mts (Bradshaw Range)
          • Agua Fria District
            • Mayer
    Rolf Luetcke
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193, 349; Hewett, et al (1963); Galbraith, F.W. & Brennan (1959), Minerals of AZ: 87.
          • Castle Creek District
    [Precious Opal] Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87.
            • Copperopolis
    Rolf Luetcke
          • Pine Grove District
            • Crown King
              • Lane Mountain
    [MinRec 22:21]
          • Tip Top District
    [var: Opal-AN] Dale, V.B. (1961), Tungsten Deposits of Gila, Yavapai, and Mohave Counties, Arizona, US Bureau of Mines Information Circular 8078
        • Camp Verde District
    [var: Diatomite] MRDS database Dep. ID #10060244, MRDS ID #TC10214.
        • Eureka District
          • Bagdad
    Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87.
        • Mayer
          • Agua Fria River
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 195; Hewett, D.F. & M. Fleischer (1960), Deposits of the manganese oxides, Econ.Geol.: 55: 1-55.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87.
      • Yuma Co.
        • Kofa Mts (S.H. Mts)
          • Kofa District
            • Kofa Game Range
    [var: Opal-AN] Former Don Miller collection
        • Muggins Mts
          • Muggins District
    Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geol. Sur. Br. Bull. 192, Index of Mining Properties in Yuma Co., Arizona: 164 (Table 4); US Atomic Energy Commission Prelim. Reconnaisance Reports; Arizona Bureau of Mines file data.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 127, 155, 193, 411; Outerbridge, W.F., et al (1960), Weeksite, a new uranium silicate from the Thomas Range, Juab Co., UT, Am.Min.: 45: 39-52.
    • Arkansas
      • Garland Co.
        • Lake Catherine
    Rocks and Minerals, (1988) 63:104-125
        • Wilson Springs (Potash Sulfur Springs)
          • Union Carbide Mine
    R&M 70:3 pp 154-170
    [var: Geyserite] Jay Ellis Ransom,1974, Gems and Minerals of America
        • Hot Springs
          • Indian Mountain
    [var: Diatomite] Rocks and Minerals, (1988) 63:104-125
    Rocks and Minerals, (1976) 51:495-507
    Henry Barwood - unpublished (2010)
      • Pike Co.
        • Murfreesboro
    [var: Opal-AN] P Cristofono collection, 2007
      • Polk Co.
        • Shady
    Rocks & Min.:63:118.
    Rocks and Minerals, (1988) 63:104-125
      • Pulaski Co.
        • Little Rock
    Rocks and Minerals, (1988) 63:104-125; Rocks and Minerals, (1989) 64:314-322
    Henry Barwood - unpublished (2010)
      • Sevier Co.
        • Gillham
    Rocks & Min.:63:123; Howard(1979).
    • California
      • Alpine Co.
    MinRec 22:29-42
          • Leviathan Peak
    Pabst, Adolf (1940), Cryptocrystaline pyrite from Alpine County, California: American Mineralogist: 25: 425
      • Amador Co.
    [var: Wood Opal] California Journal of Mines and Geology (1954): 50(1); January, 1954: 211.
      • Calaveras Co.
        • French Creek District
          • Mountain Top
    USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109076.
        • Mokelumne Hill District
          • Mokelumne Hill
            • Chili Gulch (Chile Gulch ?)
    Browne, J.R. (1869), Report of J. Ross Browne on the mineral resources of the states and territories west of the Rocky Mountains (US Treasury Dept.), 674 pp., H.H. Bancroft and Co., San Francisco [reprint of 2]: 56; Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 76; Lewis, W. Scott (1933), Occurrences of opal in California: Rocks & Minerals: 8: 36-37.
    Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 87-88.
    Clark, William B. & Lydon, Philip A., California division of mines and geology (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, page 91
        • Mother Lode Belt
          • Carson Hill District
            • Carson Hill
    Dana 7:I:206; Dana 6: 1095.
      • Colusa Co.
        • Coast Ranges
          • Sugarloaf
    USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10029530.
          • Sulphur Creek District (Sulfur Creek District; Wilbur Springs District)
            • Wilbur Springs
              • Cherry Hill deposit
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Opal-C] White, D.E. (1967) Mercury and base-metal deposits with associated thermal and mineral waters. In: H.L. Barnes (Editor), Geochemistry of hydrothermal ore deposits. Holt Reinhart and Winston, New York: 591; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 351.
    [var: Opal-C] White, D.E. (1967) Mercury and base-metal deposits with associated thermal and mineral waters. In: H.L. Barnes (Editor), Geochemistry of hydrothermal ore deposits. Holt Reinhart and Winston, New York: 591; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 355.
    Slowey, A.J., and Rytuba, J.J. (2008): USGS Open-File Report 08-1179
      • Contra Costa Co.
        • Bayview-Montalvin
    [var: Diatomite] Davis, Fenelon Francis & J.W. Vernon (1951), Mines and mineral resources of Contra Costa County, California: California Journal of Mines and Geology (Report 47): 47(4): 574, 610; Davis, Fenelon Francis and H.B. Goldman (1958) Mines and mineral resources of Contra Costa County. California Journal of Mines and Geology: 54(4): 521, 571, Pl. 5.
      • El Dorado Co.
        • Flagstaff Hill Area
          • Pilliken
            • Salmon Falls
              • Pilliken Mine (Pillikan Mine; Pilliken Chrome Mine; Flagstaff Hills; Pilikin area 1-4)
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Salmon Falls
          • Flagstaff Hill area
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Big Creek-Rush Creek District
    Alfors, J.T., M.C. Stinson, R.A. Matthews & A. Pabst (1965), Seven new barium minerals from eastern Fresno County, California: American Mineralogist: 50: 318, 322-324; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 464.
        • Diablo Range
          • Little Panoche Detention Dam
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10212376.
          • Tumey Hills
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10212435.
        • Fresno
          • Mountains East of Fresno
    [var: Moss Opal] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
      • Glenn Co.
        • Coastal Range
          • Red Mountain
            • Black Diamond group
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Imperial Co.
        • Chocolate Mts
          • Paymaster District
    [var: Opal-Agate]
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Coso Mts (Coso Range)
    Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 115.
            • Coso Hot Springs
              • Coso Hot Springs deposit
    www.mineralsocal.org; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    Troxel, Bennie Wyatt, Stinson, M.C., and Chesterman, C.W. (1957) Uranium. California Division of Mines Bulletin 176: 672-674; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 355.
            • Sugarloaf Mountain
    Rogers, Austin Flint (1922), A new occurrence of cristobalite in California: Journal of Geology: 30: 211-216; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 162.
    Pemberton, H. Earl (1983), Minerals of California: 351.
        • Darwin Hills
          • Darwin District
            • Darwin
    [var: Opal-AN] Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 355.
        • Lake Tecopa Basin
    USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10100710.
        • Saline Valley
          • Badwater Springs
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10114829.
        • Saratoga District (Tecopa Mountain District; Shoshone District ?)
          • Dublin Hills
            • Shoshone
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Kern Co.
        • Boron
    Walker, G.W., Lovering, T.G., and Stephens, H.G. (1956), Radioactive Deposits in California: Special Report 49 of the California Division of Mines & Geology: 19; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 326.
        • El Paso Mts
          • Last Chance Canyon
    [Precious Opal] Christopher N. Wentzell
    [Precious Opal] Christopher Wentzell
    [var: Wood Opal] Dibblee, T.W., Jr. and T.E. Gay (1952) Mineral deposits of Saltdale quadrangle. California Division Mines and Geology Bulletin 160: 49-50; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282; Sinkankas, J. (1976) Gemstones of North America II. Van Nostrand Reinhold Co., New York: 58-59; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 355.
    MacFall (1951), Gem Hunter's Guide, 1st ed.
          • Ricardo
    Murdoch, Joseph & Robert W. Webb (1942), Notes on some minerals from southern California, III: American Mineralogist: 27: 330; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 71; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 368-369; Tschernich, R. (1992): Zeolites of the World, 64
        • Johannesburg District
          • Johannesburg
    [var: Moss Opal] Stoddard, B.H. (1923), Gems and precious stones Mineral Resources U.S., 1920, part 2: 215-218; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Kramer District
          • Boron
    Morgan, V. and Erd, R.C. (1969) Minerals of the Kramer borate district, California California Division of Mines and Geology Mineral Information Service: 22(9&10): 165, 169; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 355.
        • Rademacher District
          • Rademacher
    Kunz, George Frederick (1900), Precious stones: Mineral Resources U.S., 1899: 54 (page = 454 ?); Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 317.
        • Rosamond
    [var: Milk Opal] Lewis, W. Scott (1933), Occurrences of opal in California: Rocks & Minerals: 8: 36-37; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
    [var: Diatomite] Braitwaite, R., Paar, W., and Chisholm, J., 1989, Phurcalite from Dartmoor, Southwest England,and its Identity with 'Nisaite' from Portugal, Mineralogical Magazine, 53:583-589.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Mayacmas Mts (Mayacamas Mts)
    White, D.E. (1967) Mercury and base-metal deposits with associated thermal and mineral waters. In: H.L. Barnes (Editor), Geochemistry of hydrothermal ore deposits. Holt Reinhart and Winston, New York: 589; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 356.
            • Castle Rock Springs
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
            • Middletown
              • Great Western-Mirabel group
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Opal-AN] Dana 6: 1096.
        • Sulphur Creek District (Sulfur Creek District; Wilbur Springs District)
          • Clear Lake Oaks
    Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 190; Brice, J.C. (1953), Geology of Lower Lake quadrangle, California: California Division Mines Bulletin 166: 62; White, D.E. & C.E. Roberson (1962), Sulphur Bank, California: Geological Society of America Buddington Memorial Volume: Petrologic studies: 403; Rocks & Minerals (1947): 22: 615-616.; White, D.E. (1967) Mercury and base-metal deposits with associated thermal and mineral waters. In: H.L. Barnes (Editor), Geochemistry of hydrothermal ore deposits. Holt Reinhart and Winston, New York: 579; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 215, 273, 355; Economic Geology (1988): 83: 606-618.
          • Lower Lake
    USBM IC8252
          • Wilbur Springs area
    Bailey, Edgar H. (1959), Froth veins, formed by immiscible hydrothermal fluids, in mercury deposits, California: Geological Society of America Bulletin 70: 661; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 355.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Red Rock
    [var: Diatomite] California Division of Mines and Geology (1981), Mines & Mineral Producers Active in California during 1980, Special Publication 58; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10163240.
    Butler, 1995. Rockhounding California, p.158.
        • Westwood
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10138895.
      • Los Angeles Co.
        • Acton District
          • Acton
            • Antelope Valley
    Oakeshott, Gordon Blaisdell (1958) Geology and mineral deposits of San Fernando quadrangle, Los Angeles County, California. California Division of Mines Bulletin 172, 147 pp.
        • Charter Oak
    [var: Diatomite] Sampson, Reid J. (1937), Mineral resources of Los Angeles County, California: California Journal of Mines and Geology, California Mining Bureau (Report 33): 33(3): 202; Gay, T.E. and Hoffman, S.R. (1954) Mines and mineral deposits of Los Angeles County, California. California Journal of Mines and Geology, California Division of Mines (Report 50): 50(3&4): No. 144, p. 664.
        • Lang
    mineralsocal.org
        • Lomita
    [var: Diatomite] Merrill, Frederick James Hamilton (1916), San Diego, Imperial Counties: Calif. Min Bureau Report 14: 635-743; …(abstract): Geol. Zentralbl., Band 27: 395 (1922): 507; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Malibu
          • Point Dume
    [var: Diatomite] Gay, T.E. and Hoffman, S.R. (1954) Mines and mineral deposits of Los Angeles County, California. California Journal of Mines and Geology, California Division of Mines (Report 50): 50(3&4): 664.
        • Palmdale
          • Hunt Canyon
    Pemberton, H. Earl and Alexander, G.S. (1968) A new zeolite locality – overlooked 115 years ago. Mineral Explorer 2, 8 pp.: 7; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 353-354, 355, 373-374, 376.
        • Palos Verdes peninsula
          • Rolling Hills
    [var: Diatomite] California Division of Mines and Geology, Mineral Information Service: California Mineral Production 1962: 16(11): 11, 13; USGS MRDS database (2005).
        • Rolling Hill Estates
    [var: Diatomite] California Journal of Mines and Geology (1937): 33: 201-202; Gay, T.E. and Hoffman, S.R. (1954) Mines and mineral deposits of Los Angeles County, California. California Journal of Mines and Geology: 50: No. 143, p. 664.
        • San Gabriel Mts
          • Kagel Canyon
    [var: Diatomite] Gay, T.E. and Hoffman, S.R. (1954) Mines and mineral deposits of Los Angeles County, California. California Journal of Mines and Geology, California Division of Mines (Report 50): 50(3&4): No. 207, p. 688.
        • Santa Catalina Island
    Bailey, Edgar H. (1941a), Mineralogy, petrology and geology of Santa Catalina Island, California: Unpublished Ph.D. dissertation, Stanford University: 56, 75; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 422.
    [var: Diatomite] Fleischer, P. (1972) Sepiolite associated with Miocene diatomite, Santa Cruz basin, California. American Mineralogist: 57: 903-913; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 441.
        • Santa Monica Mts
          • Los Angeles
            • Hollywood Hills
              • Hollywood
                • Cahuenga Pass
                  • Cahuenga Boulevard roadcut
    Neuerberg, George Joseph (1951), Minerals of the eastern Santa Monica Mountains, Los Angeles city: American Mineralogist: 36: 156-160.
      • Madera Co.
        • Indian Springs
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10256808.
    [var: Opal-AN] Pelletier, 1962. Mineral Species & Localities of Marin County
      • Mendocino Co.
        • Cloverdale area
          • Russian River
    Pabst, Adolf, Gross, E.B., and Alfors, J.T. (1967) Rosenhahnite, a new hydrous calcium silicate from Mendocino County, California. American Mineralogist: 52: 336; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 355.; Pabst, Adolf, Gross, E.B., and Alfors, J.T. (1967) Rosenhahnite, a new hydrous calcium silicate from Mendocino County, California. American Mineralogist: 52: 336-351
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • California Aquaduct Dos Amigos Pumping Station
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10139878.
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10207641.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Benton Range
          • Chidago District
            • Banner Ridge
    Calif Div Mines SR48 "Economic Geology of the Casa Diablo Mtn Quad CA"
    [var: Opal-AN] Lemmon, Dwight Moulton (1941b), Tungsten deposits of the Benton Range, Mono County, California: USGS Bulletin 22-S: 591; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 176, 282; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 355.
        • Bodie Hills
          • Bridgeport District
            • Bridgeport
    Holmes, G.H. (1965) Mercury in California. US Bureau of Mines Information Circular 8252: 176-177; Pemberton, H. Earl (1983), Minerals of California: 117.
            • Potato Peak
    Holmes, G.H. (1965) Mercury in California. US Bureau of Mines Information Circular 8252: 176-177; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 117.
            • Willow Springs
    Holmes, Jr., G.W. (1965), Mercury in California: in: U.S. Bureau of Mines Information Circular 8252; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 117.
      • Monterey Co.
        • Diablo Range
          • Parkfield District
            • Parkfield
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • King City
    [var: Diatomite] Hart, E.W. (1966) Mines and mineral resources of Monterey County, California. California Division Mines and Geology County Report 5, 142 pp.: 40-41.
        • Santa Lucia Mts (Santa Lucia Range)
          • Bradley
    [var: Diatomite] Hart, E.W. (1966) Mines and mineral resources of Monterey County, California. California Division Mines and Geology County Report 5, 142 pp.: 39; USGS MRDS database (2005).
    [var: Diatomite] Hart, E.W. (1966) Mines and mineral resources of Monterey County, California. California Division Mines and Geology County Report 5, 142 pp.: 39-40; USGS MRDS database (2005).
    [var: Diatomite] Hart, E.W. (1966) Mines and mineral resources of Monterey County, California. California Division Mines and Geology County Report 5, 142 pp.: 40.
    [var: Diatomite] Hart, E.W. (1966) Mines and mineral resources of Monterey County, California. California Division Mines and Geology County Report 5, 142 pp.: 40; USGS MRDS database (2005).
          • Bryson
    [var: Diatomite] Hart, E.W. (1966) Mines and mineral resources of Monterey County, California. California Division Mines and Geology County Report 5, 142 pp.: No. 31, p. 123; USGS MRDS database (2005).
    [var: Diatomite] California Geology (1981): 185, figure 2 (September, 1981): 185, figure 2; USGS MRDS database (2005).
          • Del Rey Oaks
    [var: Diatomite] Hart, E.W. (1966) Mines and mineral resources of Monterey County, California. California Division Mines and Geology County Report 5, 142 pp.: 41.
    [var: Opaline] [Clark, 1993 - "Hey's Mineral Index"]
        • Knoxville area
    USGS MRDS database (2005), loc. file ID #10031632.
        • Knoxville District
    [var: Prase Opal] Rocks&Min 11(8):117
    Sherlock, R.L. and Lehrman, N.J. (1995), Occurrences of dendritic gold at the McLaughlin Mine. Mineralium Deposita: 30 (3-4): 323-327.
    Rogers, Austin Flint (1931b), Castanite, a basic ferric sulphate from Knoxville, California: American Mineralogist: 16: 397; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 273.
        • Mayacmas Mts (Mayacamas Mts)
          • Calistoga District (Silverado District)
            • Calistoga
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
              • Twin Peaks
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
            • Calistoga Hot Springs
    USGS MRDS database (2005), loc. file ID #10031657.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
          • Oakville District
            • Oakville
    [var: Diatomite] California Geology (1981): 185, figure 2 (September, 1981); USGS MRDS database (2005), loc. file ID #10212662.
        • Vichy Springs
    [var: Diatomite] Weaver, C.E. (1949), Geology and Mineral Deposits of an Area North of San Francisco Bay, California: California Division of Mines Bulletin 149: 87, Pls. 4 & 6.
      • Nevada Co.
        • Nevada City District (Grass Valley District)
          • Grass Valley
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Laguna Woods
    [var: Diatomite] California Preliminary Report: 15: Pls. 4 and 1.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
      • Plumas Co.
        • Clio
    Rocks & Min.: 17:412.
      • Riverside Co.
        • Crestmore
          • Crestmore quarries
            • Sky Blue Hill
    [var: Opal-AN] Woodford, A.O., Crippen, R.A., and Garner, K.B. (1941) Section Across Commercial Quarry, Crestmore, California. American Mineralogist: 26: 366, 368; Woodford, A.O. (1943), Crestmore minerals: California Division Mines Report 39: 359; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 356.
        • Jurupa Mts
          • Jurupa
    MinRec 15:273-290
        • Mule Mts
      • San Benito Co.
        • Diablo Range
          • New Idria District
            • Picacho Peak
    Lapis 19(12), 40 (1994); Mineralogical Record (1993): 24: 471-475.
    [var: Diatomite] Anderson, Robert, and Robert W. Pack (1915), Geology and oil resources of the west border of the San Joaquin valley north of Coalinga, California, USGS Bulletin 603, 220 pp.: 211; USGS MRDS database (2005), loc. file ID #10285956.
      • San Bernardino Co.
        • Baker
          • Otto Mountain
    [var: Opal-AN] Eckhard D. Stuart collection
        • Bloomington
    Cooney, R.L. (1956), The mineralogy of the Jensen and Henshaw quarries near Riverside, California: Unpublished Master’s thesis, University of California at Los Angeles: 22, 34; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 356.
        • Cady Mts
          • Afton
        • Fort Irwin
        • Hinkley
          • Black Canyon
    Kunz, George Frederick (1903), Precious stones: Mineral Resources U.S., 1902: 76 (?); Baker, Charles L. (1911), Notes on the later Cenozoic history of the Mohave Desert region in southeastern California: California University Department of Geological Science Bulletin: 6: 347 (?); Sterrett, Douglas Bovard (1912), Gems and precious stones: Mineral Resources U.S., 1911, part 2: 1050; Sinkankas, J. (1959) Gemstones of North America. D. Van Nostrand Co., New York, 675 pp.: 124.
    Christopher N. Wentzell
    Tschernich, 1992. Zeolites of the World, p.315
        • Signal District (Vontrigger District)
        • Soda Lake Mts
          • Baker
    [var: Opal-AN] Collected by Brent Thorne
      • San Diego Co.
        • Aguanga Mountain District (Smith Mountain District)
          • Oak Grove
            • Aguanga Mountain
    [var: Opal-AN] Cordova, E. M. 2009. Personal communication with S. L. Ritchie, SDMC, Feb.
        • Pala District
          • Pala
    Jahns, Richard Henry & Wright, Lauren A. (1951), Gem and lithium-bearing pegmatites of the Pala district, San Diego County, California. California Division of Mines Special Report 7-A: p. 31.
        • Rincon District
          • Rincon
            • Rincon Mountain
    [var: Opal-AN] Rogers, A. F. 1910. Minerals From The Pegmatite Veins Of Rincon, San Diego Co., California. Columbia University School Of Mines Quarterly Journal Of Applied Science, Vol. 31 pp. 208-218.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Los Osos
    [var: Diatomite] Laizure, Clyde McK (1925), San Francisco field division: California Journal of Mines and Geology, California Mining Bureau (Report 21): 21: 512; Franke, Herbert A. (1935a), Mines and mineral resources of San Luis Obispo County, California: California Division Mines (Report 31): 31(4): 419; USGS MRDS database (2005).
    [var: Diatomite] Laizure, Clyde McK (1925), San Francisco field division: California Journal of Mines and Geology, California Mining Bureau (Report 21): 21: 512-513; Franke, Herbert A. (1935a), Mines and mineral resources of San Luis Obispo County, California: California Division Mines (Report 31): 31(4): 419-420.
    [var: Diatomite] Minobras (1973), Southern California Industrial Minerals: 91; USGS MRDS database (2005).
        • Pismo Beach
    [var: Diatomite] Laizure, Clyde McK (1925), San Francisco field division: California Journal of Mines and Geology, California Mining Bureau (Report 21): 21: 513; Minobras (1973), Southern California Industrial Minerals: 90.
        • San Luis Obispo
    [var: Diatomite] Laizure, Clyde McK (1925), San Francisco field division: California Journal of Mines and Geology, California Mining Bureau (Report 21): 21: 512; USGS MRDS database (2005).
        • Santa Lucia Mts (Santa Lucia Range)
          • Arroyo Grande
    [var: Diatomite] Laizure, Clyde McK (1925), San Francisco field division: California Journal of Mines and Geology, California Mining Bureau (Report 21): 21: 512; USGS MRDS database (2005), loc. file ID #10286912.
          • Cambria-Oceanic District
            • Cambria
    Am Min 64:3-4 pp 1026-1038
          • Chorro
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Shell Beach
    [var: Diatomite] Franke, Herbert A. (1935a), Mines and mineral resources of San Luis Obispo County, California: California Division Mines (Report 31): 31(4): 419; USGS MRDS database (2005).
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Palo Alto area
    Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50; Bradley, W.W. (1918), Quicksilver resources of California, with a section on metallurgy and ore dressing: California Mining Bureau. Bulletin 78: 149; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 173-174.
      • Santa Barbara Co.
        • Buellton
    [var: Diatomite] California Geology (1981): 185, figure 2 (September, 1981); USGS MRDS database (2005).
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 4; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10262279.
        • Las Cruces
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10262074.
        • Lompoc
    [var: Diatomite] USGS MRDS database (2005).
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3; California Division of Mines (1962): Mineral Information Service: 15(2): 6; USGS MRDS database (2005).
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: 77-78; USGS MRDS database (2005).
    [var: Diatomite] California Division of Mines and Geology (1990), Mines and mineral producers active in California (1988-89), California Department of Conservation, Division of Mines and Geology, Special Publication 103; USGS MRDS database (2005).
    [var: Diatomite] Huguenin, Emile (1919), Santa Barbara, Ventura Counties: California Division Mines Report 15: 737; Mulryan, Henry (1936), Geology, mining and processing of diatomite at Lompoc, Santa Barbara County, California: A.I.M.E. Tech. Pub. 687, 30 pp.: 133; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10213713.
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10286715.
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10116715.
    [var: Diatomite] California Division of Mines Bulletin 186 (1966): Pl. 3; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10117036.
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10286712.
        • Los Olivos
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 4; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10213477.
        • Santa Maria
    Rogers, Austin Flint (1938), Fossil termite pellets in opalized wood from Santa Maria, California: American Journal of Science, 5th. Series: 36: 389-392; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Santa Ynez
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 4.
        • Solvang
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 4; USGS MRDS database (2005).
        • Vandenberg Air Force Base
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10189485.
    [var: Diatomite] Dibblee, T.W., Jr. (1950) Geology of southwestern Santa Barbara County, California, Point Arguello, Lompoc, Point Conception, Los Olivos, and Gaviota Quadrangles, California Division of Mines Bulletin 150: Pl. 3; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10286976.
      • Santa Clara Co.
        • Diablo Range
          • Coyote District
            • Coyote
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
          • Mount Hamilton
            • Mount Hamilton area
    Murata, K.J. and Whiteley, K.R. (1973) Zeolites in the Miocene Brones sandstone and related formations of the central Coast Ranges, California. USGS Jour. Res.: 1: 256-257, 259; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 374.
        • San Jose
          • Oak Hill
    Crittenden, Max D., Jr. (1951), Geology of the San Jose-Mount Hamilton area, California: California Division Mines Bulletin 157: 63; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 172; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 221.
        • Santa Cruz Mts
          • New Almaden District
            • New Almaden
              • Almaden Quicksilver County Park
    Bradley, W.W. (1918), Quicksilver resources of California, with a section on metallurgy and ore dressing: California Mining Bureau. Bulletin 78, 389 pp.: 191.
    Rocks & Minerals (1944): 19: 346-347.
      • Shasta Co.
        • Cascade Range
          • Brush Mountain
    [var: Diatomite] Diller, J.S. (1895), Description of the Lassen Peak quadrangle, California: USGS Geol. Atlas, Lassen Peak folio (No. 15); […(abstract): Journal of Geology: 3: 974-976]; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10117079.
          • Burney Spring Mountain
    [var: Diatomite] Bradley, W.W. (1940), Thirty-sixth report of the State Mineralogist: California Division Mines Report 36: 107; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 382.
    [var: Diatomite] California Division of Mines and Geology (1990), Mines and mineral producers active in California (1988-89), California Department of Conservation, Division of Mines and Geology, Special Publication 103; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10256731.
    [var: Diatomite] California Division of Mines and Geology (1981), Mines & Mineral Producers Active in California during 1980, Special Publication 58; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10286607.
    [var: Diatomite] Logan, Clarence August (1926), El Dorado, Shasta and Trinity Counties: California Mining Bureau. Report 22: 1-67, 163-166; Averill, Charles V. (1939), Mineral resources of Shasta County: California Journal of Mines and Geology, California Division of Mines (Report 35): 35(2): 128-129; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077513, 10111066, & 10237834.
    [var: Diatomite] Averill, Charles V. (1939), Mineral resources of Shasta County: California Journal of Mines and Geology, California Division of Mines (Report 35): 35(2): 128-129; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10111066 & 10237834.
    [var: Diatomite] California Division of Mines and Geology, Mineral Information Service (1963): 16(2); USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10116501.
          • Chalk Mountain
    [var: Diatomite] Averill, Charles V. (1939), Mineral resources of Shasta County: California Journal of Mines and Geology, California Division of Mines (Report 35): 35(2): 128; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10111067 & 10286850.
          • Haney Mountain
    [var: Diatomite] California Geology (1981): 185, figure 2 (September, 1981); USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10213865.
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10237757.
          • Lassen Volcanic National Park
    Williams, Howel (1932), Geology of the Lassen Volcanic National Park, California: University of California Department of Geological Sciences Bulletin: 21: 249; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 235; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 265, 438.
    Robert G. Lee, John H. Dilles, David A. John, Tanya L. Abela (2005) The mineralogy and origin of hydrothermally altered Quaternary volcanic rocks on the south flank of Lassen volcano, California: Interim report for USGS Mineral Resource External Research Program grant of $42,000 in FY 2005
          • Lookout Mountain
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10262263.
          • Shingletown
    [var: Diatomite] California Journal of Mines and Geology (1928) (Report 24): 24: 166; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077512 & 10164811.
        • Klamath Mts
          • East Shasta Copper - Zinc District
            • Heroult
    USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077528.
      • Siskiyou Co.
        • Cascade Range
          • Copco Lake
    [var: Diatomite] California Division of Mines Bulletin 151: 59.
          • Lava Beds National Monument
    Swartzlow, Carl Robert & Walter David Keller (1937), Coralloidal opal: Journal of Geology: 45: 101-108; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 356.
        • Dunsmuir
    MacFall, 1951. Gem Hunter's Guide, 1st ed.
        • Klamath Mts
          • Shasta Retreat
            • Mount Bradley
    [var: Fire Opal] Murdoch, Joseph (1946), Progress on revision of Bulletin 113 “Minerals of California,” with notes on some new mineral occurrences: California Division Mines Report 42: 197-198; […(abstract): Geological Society of America Bulletin: 57: 1256]: 101; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10286923.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Coast Range
          • Guerneville District
            • Guerneville
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Quicksilver resources of California: with a section on metallurgy and ore ... By Walter Wadsworth Bradley (1917)
          • Warm Springs Dam
            • Skaggs Springs
    Everhart, Donald Lough (1950a), Skaggs Springs quicksilver mine, Sonoma County, California: California Journal of Mines and Geology: 46: 390; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 124, 343; American Mineralogist (2009): 94: 1325–1332.
        • Glen Ellen
          • Weise Ranch
    [var: Fire Opal] Bradley, W.W. (1916a), Colusa, Glenn, Lake, Marin, Napa, Solano, Sonoma, Yolo County: California Mining Bureau. Report 14: 321; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
        • Mayacmas Mts (Mayacamas Mts)
          • Fetters Hot Springs
    [var: Diatomite] Honke, Martin T., Jr. & Wm. E. Ver Planck, Jr. (1950), Mines and mineral resources of Sonoma County, California: California Journal of Mines and Geology: 46(1): 97; Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 282.
          • West Mayacmas District
            • Castle Rock Springs area
    Bailey, Edgar H. (1946), Quicksilver deposits of the western Mayacmas district, Sonoma County, California: California Journal of Mines & Geology, California Division Mines (Report 42): 42: 199-230; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 356.
    Bradley, W.W. (1918), Quicksilver resources of California, with a section on metallurgy and ore dressing: California Mining Bureau. Bulletin 78, 389 pp.: 191.
            • Cloverdale
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
            • Mark West Springs
    [var: Diatomite] Honke, Martin T., Jr. & Wm. E. Ver Planck, Jr. (1950), Mines and mineral resources of Sonoma County, California: California Journal of Mines and Geology: 46(1): 94; USGS MRDS database (2005).
    Vonsen, Magnus (1941) Preliminary report on minerals of The Geysers of Sonoma County, California. Mineralogist: 9: 247; Vonsen, Magnus (1946), Minerals at “The Geysers,” Sonoma County, California: California Division Mines Report 42: 291; 87-293; White, D.E. (1967) Mercury and base-metal deposits with associated thermal and mineral waters. In: H.L. Barnes (Editor), Geochemistry of hydrothermal ore deposits. Holt Reinhart and Winston, New York: 590; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 356; Dunning, G. S. & Cooper, J. F. (1993): History and minerals of The Geysers Sonoma County, California. Mineralogical Record (1993): 24(5): 339-352.
        • Sonoma Mts
          • El Verano
    [var: Diatomite] Honke, Martin T., Jr. & Wm. E. Ver Planck, Jr. (1950), Mines and mineral resources of Sonoma County, California: California Journal of Mines and Geology: 46(1): 94, 97 (?); USGS MRDS database (2005).
          • Glen Ellen
    [var: Diatomite] Honke, Martin T., Jr. & Wm. E. Ver Planck, Jr. (1950), Mines and mineral resources of Sonoma County, California: California Journal of Mines and Geology: 46(1): 94.
      • Stanislaus Co.
        • Cooperstown
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10166124.
        • Crows Landing
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10166026.
      • Tehama Co.
        • Inskip Hill
    Anderson, Charles A. (1930), Opal stalactites and stalagmites from a lava tube in northern California: American Journal of Science, 5th. Series: 20: 22-26; Anderson, Charles A. (1931b), Opal stalactites from a lava tube in northern California (abstract): Geological Society of America Bulletin: 42: 310; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 356.
      • Trinity Co.
        • Coastal Range
          • Wildhorse Peak
    USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077858.
    [var: Diatomite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
      • Tuolumne Co.
        • East Belt
          • Big Oak Flat District
            • Groveland
    [var: Diatomite] USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10111242 & 10263044.
      • Ventura Co.
        • Fillmore
    [var: Diatomite] Huguenin, Emile (1919), Santa Barbara, Ventura Counties: California Division Mines Report 15: 761; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 288.
    • Colorado
      • Archuleta Co.
        • Wolf Creek Pass
    Rocks & Minerals 79:5 pp316-324
      • Boulder Co.
        • Boulder Co. Tungsten District
    USGS Bull 583
    Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) E.B. Eckels; U.S. Geological Survey Professional Paper 223
      • Chaffee Co.
    Ralph Van Alstine, (1969), USGS Prof. Paper 626
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
          • Poncha Springs
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Opal-AN] Minerals of Colorado (1997) E.B. Eckels
        • Chalk Creek District
    Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 506.
    Minerals of Colorado (1997) Eckels, E. B.
        • Nathrop
    USGS Bull 1716C
        • Poncha Pass Area
    Minerals of Colorado (1997) Eckels, E. B.
        • Sedalia District
    ("Minerals of Colorado, updated & revised", by Eckel, Edwin B., 1997); U.S. Geological Survey Professional Paper 829
        • Turret District
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Clear Creek Co.
        • Idaho Springs District
    Minerals of Colorado (1997) E.B. Eckels
        • Lamartine District
    U.S. Geological Survey Professional Paper 319
    Minerals of Colorado (1997) Eckels, E. B.; U.S. Geological Survey Professional Paper 223; U.S. Geological Survey Professional Paper 319
      • Conejos Co.
        • Manassa
    "Minerals of Colorado, updated & revised", p. 13, by Eckel, Edwin B., 1997
      • Custer Co.
        • Rosita District
    Minerals of Colorado (1997) E.B. Eckels
      • Douglas Co.
        • Castle Rock Area
    [var: Wood Opal] Minerals of Colorado (1997) E.B. Eckels
      • Eagle Co.
        • Wolcott
    [var: Opal-AN] collected specimens by Alan Goldstein.
      • El Paso Co.
        • Mount Rosa
    Minerals of Colorado (1997) E.B. Eckels
      • Fremont Co.
        • McIntyre Hills Area
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; USGS Prof. Paper 227
        • Tallahassee Creek District
    [var: Wood Opal] Minerals of Colorado (1997) E.B. Eckels; USGS OFR 84-219
    [var: Wood Opal] Minerals of Colorado (1997) E.B. Eckels; USGS OFR 84-219
      • Garfield Co.
        • Colorado River
    [var: Opal-AN] Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) Eckel, E. B.
      • Grand Co.
    [var: Opal-AN] Minerals of Colorado (1997) E.B. Eckels
      • Gunnison Co.
    [var: Opal-AN] Minerals of Colorado (1997) E.B. Eckels
        • Vulcan District (Cebolla District; Domingo District)
          • Vulcan
    Minerals of Colorado (1997) E.B. Eckels
        • White Earth District (Powderhorn District)
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Hinsdale Co.
        • Galena District (Henson Creek District)
    Minerals of Colorado (1997) E.B. Eckels
        • Park District (Whitecross District; Burrows Park District; Adams District)
    [var: Opal-AN] Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) Eckel, E. B.
      • Jefferson Co.
        • Clear Creek Canyon
    Minerals of Colorado (1997) E.B. Eckels
        • Golden District
          • Golden
    Minerals of Colorado (1997) E.B. Eckels
    Rocks & Minerals 79:4
    MinRec 19:153
      • Lake Co.
        • Leadville District
          • Leadville
    The Oxidized Zinc Ores of Leadville Colorado, G. F. Loughlin, 1918
            • Breece Hill
    The Oxidized Zinc Ores of Leadville Colorado, G. F. Loughlin, 1918
      • Larimer Co.
    [var: Opal-AN] Minerals of Colorado (1997) E.B. Eckels
        • Rocky Mountain National Park
    Minerals of Colorado (1997) E.B. Eckels
      • Mesa Co.
        • Fruita
    Minerals of Colorado (1997) E.B. Eckels
    [var: Wood Opal] Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) Eckels, E. B.
      • Mineral Co.
        • Creede District
    Minerals of Colorado (1997) Eckels, E. B.
    Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) E.B. Eckels
      • Moffat Co.
        • Douglas Mountain District
    Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) E.B. Eckels
        • Maybell District
          • Maybell Mines
    Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) E.B. Eckels
      • Park Co.
        • South Park
          • Antero Junction
    Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) E.B. Eckels
      • Rio Blanco Co.
    Minerals of Colorado (1997) Eckels, E. B.
      • Saguache Co.
    Rocks & Minerals (July-August, 2002)
    [var: Opal-AN] Minerals of Colorado (1997) E.B. Eckels
      • San Juan Co.
    Desborough, G. A., Smith, K. S., Lowers, H. A., Swayze, G. A., Hammarstrom, J. M., Diehl, S. F., Leinz, R. W. and Driscoll, R. L. (2010): Mineralogical and chemical characteristics of some natural jarosites. Geochimica et Cosmochimica Acta, 74, 1041-1056.
      • Summit Co.
        • Montezuma Area
    Minerals of Colorado (1997) E.B. Eckels
      • Teller Co.
    American Mineralogist (1982): 67: 184.
        • Bull Hill
          • Blue Bird Mine
    Rob Lavinsky (ex. Rochard Kosnar specimen)
    Minerals of Colorado (1997) E.B. Eckels
    Minerals of Colorado (1997) Eckels, E. B.
    Min Rec 36:2 pp143-185
    [var: Wood Opal] Minerals of Colorado (1997) E.B. Eckels
      • Weld Co.
        • Stoneham
    Minerals of Colorado (1997) Eckel, E. B.
      • Yuma Co.
        • Republican River
    [var: Moss Opal] Minerals of Colorado (1997) E.B. Eckels
    • Connecticut
      • Fairfield Co.
        • Bethel
    [var: Opal-AN] Januzzi, 1976. Mineral Localities of CT and Southeastern NY State
        • Brookfield
    [var: Opal-AN] Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
        • Danbury
    [var: Opal-AN] Januzzi, Ronald E. (1976): Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut: 192-201.
    Rocks & Minerals (1995) 70:396-409
        • Newtown
          • Hawleyville
    [var: Opal-AN] Januzzi (1976): Mineral Localities of Connecticut and Southeastern New York State
    [var: Opal-AN] Januzzi, 1976. Mineral Localities of CT and Southeastern NY State
          • Branchville
    [var: Opal-AN] Januzzi, 1976. Mineral Localities of CT and Southeastern NY State; Januzzi (1994) Mineral Data Book
    [var: Opal-AN] Januzzi, 1976. Mineral Localities of CT and Southeastern NY State
        • Trumbull
          • Long Hill
    [var: Opal-AN] Januzzi, Ronald E. (1976): Mineral Localities of CT and Southeastern NY State. The Mineralogical Press, Danbury, Connecticut.
    [var: Opal-AN] field trip report, Garnet Gazette, December 2004, p 3.
      • Hartford Co.
        • Glastonbury
    [var: Opal-AN]
          • South Glastonbury
    [var: Opal-AN] Betts, John. (1999): The Quarries and Minerals of the Dayton Road District, South Glastonbury, Connecticut. Rocks and Minerals. Volume 74, Number 2. pp. 110-121
    [var: Opal-AN] Harold Moritz collection
    [var: Opal-AN] Harold Moritz collection
    [var: Opal-AN] Betts, John. (1999): The Quarries and Minerals of the Dayton Road District, South Glastonbury, Connecticut. Rocks and Minerals. Volume 74, Number 2. pp. 110-121.
    [var: Opal-AN] P Cristofono collection, 2008
    [var: Opal-AN] P. Cristofono collection
      • Litchfield Co.
        • Harwinton
    [var: Opal-AN] A. Berluti Collection
    [var: Opal-AN] Januzzi, Ronald E. and David Seaman. (1976): Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.
        • New Milford
          • Upper Merryall
    [var: Opal-AN] Januzzi (1976): Mineral Localities of CT and Southeastern NY State
        • Roxbury
          • Mine Hill (Ore Hill)
    [var: Opal-AN] Januzzi, 1976. Mineral Localities of CT and Southeastern NY State
        • Thomaston
    [var: Opal-AN] Januzzi, 1976. Mineral Localities of Connecticut and Southeastern New York State (Taylor Assoc./Mineralogical Press); Rocks & Minerals (1985) 60:119-124
        • Woodbury
    [var: Opal-AN] Mike Polletta Observation
      • Middlesex Co.
    [var: Opal-AN] Personally collected by A. Berluti in 2010
    [var: Opal-AN] Collected by A. Berluti in 2009-11
        • East Hampton (Chatham)
          • Cobalt
    [var: Opal-AN] Januzzi (1976) Mineral Localities of Connecticut & Southeastern New York State
    [var: Opal-AN] Field collected by Harold Moritz.
    [var: Opal-AN] Schooner (1958 and 1961); Jones (1960)
    [var: Opal-AN] Schooner (1958); Schooner (1961)
        • Haddam
          • Haddam Neck
    [var: Opal-AN] Jones, Robert W. (1960): Luminescent Minerals of Connecticut, A Guide to Their Properties and Locations.
          • Higganum
    [var: Opal-AN] Kevin Czaja Collection
    [var: Opal-AN] Kevin Czaja Collection
        • Middletown
          • White Rock District (White Rocks District)
    [var: Opal-AN] Harold Moritz collection
    [var: Opal-AN] Schooner (1958); Harold Moritz collection
        • Portland
    [var: Opal-AN] Jones, Jr. 1960. Luminescent Minerals of CT
          • Collins Hill
    Januzzi, 1976. Mineral Localities of Connecticut and Southeastern New York State (Taylor Assoc./Mineralogical Press)
            • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
    [var: Opal-AN]
    [var: Opal-AN] Jones, Robert W. (1960) LUMINESCENT MINERALS OF CONNECTICUT, A GUIDE TO THEIR PROPERTIES AND LOCATIONS.
    [var: Opal-AN] Jones, Robert W. (1960) Luminescent Minerals of Connecticut
    [var: Opal-AN] Jones, Robert W. (1960): LUMINESCENT MINERALS OF CONNECTICUT,
    [var: Opal-AN] Rocks & Minerals (1970) 45:595-600
      • New Haven Co.
    Samuel Robinson (1825) A Catalogue of American Minerals, with their localities. Boston
          • Southford
    [var: Opal-AN] Ryerson, Kathleen H. (1972) Rockhouns Guide to Connecticut
        • Waterbury
    [var: Opal-AN] Visually identified at a CT museum, with vivid green fluorescence
    Bernstein, Lawrence (1976) Minerals of Washington D.C. and vicinity: U.S. Geological Survey: Open File Report 76-849, 183 p.
    • Florida
      • Hillsborough Co.
        • Tampa
          • Tampa Bay
    Zeitner (1968) Appalachian Gem Trails
      • Polk Co.
        • Central Florida Phosphate District (Bone Valley)
          • Homeland
    Marc V. Hurst (2012) Central Florida Phosphate District. Southeastern Geological Society Field Trip Guidebook No. 57
    • Georgia
      • Bartow Co.
        • Cartersville District
    [var: Opal-AN] Rocks & Min.: 64:185.
      • Bibb Co.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Brooks Co.
    [var: Wood Opal] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
      • Burke Co.
        • Girard District
    [var: Opal-AN] Rocks & Min.: 64:187.
    [var: Opal-AN] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
    Gems and Minerals of America- Jay Ellis Ransom-1974
      • Columbia Co.
        • Augusta
    [var: Opal-AN] Rocks & Min.:64:190.
    [var: Opal-AN] Gems and Minerals of America- Jay Ellis Ransom-1974
        • Stone Mountain-Lithonia District
    [var: Opal-AN] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
    [var: Opal-AN] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
    [var: Opal-AN] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
    [var: Opal-AN] [www.johnbetts-fineminerals.com]
        • Cave Spring
    [var: Opal-AN] Rocks & Min.:64:195; McCallie(1900).
    Gems and Minerals of America- Jay Ellis Ransom-1974
    Gems and Minerals of America- Jay Ellis Ransom- 1974
      • Rabun Co.
        • Burton
    [var: Opal-AN] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
    [var: Opal-AN]
    [var: Wood Opal] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
    [var: Wood Opal] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
        • Warthen
    Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
      • White Co.
        • Cleveland
    [var: Opal-AN] Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
    • Hawaii
      • Hawaii Co. (Hawaii Island)
    Hon, K., Bove, D.J., Lee, L., and Thornber, C., 2009, The origin and zonation of sublimates and precipitates in active Hawaiian lava tubes: Geological Society of America Abstracts with Programs, v. 41, no. 7, p.193.
      • Honolulu Co.
        • Oahu Island
          • Kailua
    Fujishima, K.Y. and Fan, P-F (1977) Hydrothermal mineralogy of Keolu Hills, Oahu, Hawaii. American Mineralogist, 62, 574-582.
    • Idaho
      • Ada Co.
        • Boise District
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Adams Co.
        • Indian Valley Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Boise Co.
        • Idaho City
    Dake, 1956. NW Gem Trails, 2nd ed.
      • Camas Co.
        • Fairfield Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Clark Co.
        • Spencer
    Extra Lapis - English No. 10 Opal
      • Custer Co.
        • Bay Horse District
          • Challis
    [var: Opal-AN] John Cornish collection
    Ream, Lanny R. 2004. Idaho Minerals, 2nd edition, Revised and Updated
    Dake, 1956. NW Gem Trails, 2nd ed.
      • Elmore Co.
        • Glenns Ferry Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • King Hill Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Gem Co.
        • Cascade Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Emmett
    The Mineralogist, v. 4, no. 1. p. 15, 15, 54.
      • Idaho Co.
    C. Lemanski, Jr. (re-entry lost Mindat data).
        • Riggins
    Ream, Lanny R. 2004. Idaho Minerals, 2nd edition, Revised and Updated; American Mineralogist, Volume 67, pages 799-803, 1982
      • Kootenai Co.
    Dake, 1956. NW Gem Trails, 2nd ed.
      • Latah Co.
    [var: Wood Opal] Dake, 1956. NW Gem Trails, 2nd ed.
    The Moscow Opal Mines 1890 to 1893 (The First Commercial Opal Mines in the United States), Ron Brockett, 1975
    Dake, 1956. NW Gem Trails, 2nd ed.
      • Lemhi Co.
        • Blackbird District
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    Dake, 1956. NW Gem Trails, 2nd ed.
        • Salmon
    [Precious Opal] Extra Lapis - English No. 10 Opal
      • Lincoln Co.
    [var: Wood Opal] Dake, 1956. NW Gem Trails, 2nd ed.
      • Nez Perce Co.
    Dake, 156. NW Gem Trails, 2nd ed.
    Dake, 1956. NW Gem Trails, 2nd ed.
        • French District
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Marsing Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    Dake, 1956. NW Gem Trails, 2nd ed.
        • Reynolds Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Riddle Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Rough Mountain District
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Twin Falls Co.
        • Buhl Area
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Valley Co.
        • Big Creek District
          • Idaho Primitive Area
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Marble Creek District
          • Idaho Primitive Area
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Monumental Creek District
          • Idaho Primitive Area
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Washington Co.
        • Monroe District
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Weiser
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Weiser District
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    R&M 70:4 pp 242-263; USGS Bull 1042D
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    • Indiana
      • Henry Co.
    [var: Wood Opal] Erd, R. C. and S.S. Greenburg (1960) Minerals of Indiana. Indiana Geological Survey Bulletin 18 73pp
    Erd, R. C. and S.S. Greenburg (1960) Minerals of Indiana. Indiana Geological Survey Bulletin 18 73pp
    • Kansas
    [var: Moss Opal] Jay Ellis Ransom,1974, Gems and Minerals of America
    [var: Moss Opal] Ransom, 1974. Gems and Minerals of America
    [var: Moss Opal] Ransom, 1974. Gems and Minerals of America
    Anderson (1994) Kentucky Geol. Survey Ser. XI Spec. Pub 20
    • Louisiana
      • Catahoula Parish
    [var: Wood Opal] Earth Treasures Vol 4, Allan W. Eckert, 1987
      • Ouachita Parish
    [var: Wood Opal] Jay Ellis Ransom,1974, Gems and Minerals of America
      • Vernon Parish
    [Precious Opal] R&M 69:3 pp 156-162
    • Maine
      • Androscoggin Co.
        • Auburn
          • East Mount Apatite District
    [var: Opal-AN] Bill Bunn
      • Cumberland Co.
        • Baldwin
          • West Baldwin
    [var: Opal-AN] No reference listed
        • Casco
    [var: Opal-AN] P Cristofono collection
    [var: Opal-AN] King & Foord, 1994. Mineralogy of Maine, V. 1.
      • Knox Co.
        • Warren
    No reference listed
      • Oxford Co.
        • Albany
    King, V. (ed.), 2009, Maine feldspar, Families, and Feuds.
    [var: Opal-AN] "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., ey.al., 1998
        • Buckfield
    [var: Opal-AN] www.geocities.com/~stuarts1031/fluorescent4.html
        • Greenwood
    [var: Opal-AN] "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
        • Newry
    [var: Opal-AN] King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed.), 2000, Mineralogy of Maine, V. 2, with updates by Van King
    [var: Opal-AN] King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed), 2000, Mineralogy of Maine, V. 2.
    [var: Opal-AN] King, V. and Foord, E., 1994, Mineralogy of Maine, v. 1; King, V, 2006, Minerals of Halls Ridge and Plumbago-Puzzle Mountain, Newry, Oxford County, Maine, Mineral News, v. 22 (6), p. 1-3.
        • Paris
    [var: Opal-AN] King, V. T. and Foord, E. E., 1994, Mineralogy of Maine, Descriptive Mineralogy, volume 1, Maine Geological Survey, Augusta, Maine, USA, pp. 418 + 88 plates.
    [var: Opal-AN]
        • Peru
    [var: Opal-AN] No reference listed
        • Rumford
    [var: Opal-AN] No reference listed
      • Sagadahoc Co.
        • Topsham
    [var: Opal-AN] Rocks & Min.: 62:413.
    [var: Opal-AN] Van King
    [var: Opal-AN] "Maine Mineral Localities, 3rd Ed." by Thompson, W.B., et.al., 1998
    • Maryland
      • Baltimore Co.
        • Delight
    Pearre, N. & A. V. Heyl (1960) Mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware: U. S. Geological Survey: Bulletin 1082K: 707-833.
          • Soldiers' Delight ridge
    Rocks & Min.:11:111; 19:148.
      • Calvert Co.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Cecil Co.
        • Pilot
    Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p.
      • Harford Co.
        • Cardiff
    [var: Opal-AN] Minerals of Maryland (1940) Charles Ostrander and Walter E. Price, Jr., Natural History Society of Maryland. p. 56
    [var: Opal-AN] Ostrander, C. W. & W. E. Price (1940) Minerals of Maryland: Natural History Society of Maryland , 92 p.
      • Montgomery Co.
        • Rockville
    minerals of washington d.c. area; L.R. Bernstein
    [var: Opal-AN] Cordua, Bill (1969) Mineralogy of a newly exposed granite near White Oaks, MD: Rocks and Minerals: 44 (2): 114-115.
    • Massachusetts
      • Berkshire Co.
    [var: Opal-AN] Gleba, 1978. Mass. Mineral & Fossil Localities
      • Essex Co.
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
    [var: Opal-AN] P Cristofono collection , 2009
    [var: Opal-AN] P. Cristofono collection 2011
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Newbury
    [var: Opal-AN] P. Cristofono collection 2011
        • North Andover
    [var: Opal-AN] P Cristofono collection , 2009
    [var: Opal-AN] P Cristofono collection , 2009
      • Franklin Co.
        • Deerfield
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities; Emerson, B. K (1882) The Deerfield Dyke and its minerals. American Journal of Science 3rd series XXIV:270-278,349-359.
    [var: Opal-AN] Emerson, B. K. (1895): A Mineralogical Lexicon of Franklin, Hampshire, and Hampden Counties, Massachusetts (USGS Bulletin 126).
    [var: Opal-AN] Emerson, B. K. (1895): A Mineralogical Lexicon of Franklin, Hampshire, and Hampden Counties, Massachusetts (USGS Bulletin 126).
      • Hampden Co.
        • Monson
    [var: Opal-AN] Emerson, B. K. (1895): A Mineralogical Lexicon of Franklin, Hampshire, and Hampden Counties, Massachusetts (USGS Bulletin 126).
      • Hampshire Co.
        • Easthampton
    Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Granby
    [var: Opal-AN] P Cristofono collection
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Ashland
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Dracut
    [var: Opal-AN] P. Cristofono collection, 2013
        • Holliston
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Hudson
    [var: Opal-AN] P Cristofono collection 2010
        • Marlborough
    [var: Opal-AN] P Cristofono collection, 2006
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Weston
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Woburn
    [var: Opal-AN] Januzzi, 1976. Mineral Localities of Connecticut and Southeastern New York State (Taylor Assoc./Mineralogical Press). Chapter: "Massachusetts Mineral Localities," p206; Rocks & Min.: 21:75.
      • Norfolk Co.
        • Wrentham
    No reference listed
      • Suffolk Co.
        • Boston
          • West Roxbury
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
      • Worcester Co.
        • Bolton
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Fitchburg
    [var: Opal-AN] P Cristofono collection
    [var: Opal-AN] P Cristofono collection , 2009
        • Hardwick
    [var: Opal-AN] Gleba, 1978. Massachusetts Mineral & Fossil Localities
        • Leominster
    [var: Opal-AN] P. Cristofono collection
    [var: Opal-AN] T Mortimer collection
    [var: Opal-AN] P Cristofono collection
    • Mississippi
    Journal of the Mississippi Academy of Sciences, Jan. 2004
      • Tippah Co.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    • Missouri
      • Camden Co.
    R&M 73:2 pp 98-117
      • Jackson Co.
    Rocks & Min., March 1998.
      • Wayne Co.
    [var: Opal-AN] R&M 73:2 pp 98-117
    • Montana
    [var: Wood Opal] Jay Ellis Ransom,1974, Gems and Minerals of America
      • Fergus Co.
        • South Moccasin Mts
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    Jay Ellis Ransom,1974, Gems and Minerals of America
    Rob Lavinsky specimen
      • Lewis and Clark Co.
        • Blue Cloud District
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Madison Co.
        • Lower Hot Springs District (Norris District)
    USGS Bull 574
      • Ravalli Co.
    WC van Laer, 2009
      • Wibaux Co.
    Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240; Chris Tucker and John Betts specimens.
    • Nebraska
    [var: Wood Opal]
    [var: Wood Opal]
    [var: Wood Opal] The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    [var: Wood Opal]
    [var: Wood Opal] The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    The Minerals and Gemstones of Nebraska CSD U Neb EC 2
      • Cuming Co.
    [var: Wood Opal] Rocks & Minerals (1955) 30:372
      • Custer Co.
    [Precious Opal] The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    Zeitner (1956), Midwest Gem Trails
      • Dodge Co.
    [var: Wood Opal] The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    [var: Moss Opal] Jay Ellis Ransom,1974,Gems and Minerals of America
    The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    [Precious Opal] The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    [var: Wood Opal] The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    [var: Wood Opal]
    The Minerals and Gemstones of Nebraska CSD U Neb EC 2
      • Morrill Co.
    The Minerals and Gemstones of Nebraska CSD U Neb EC 2
    MacFall (1975) Gem Hunter's Guide
    [var: Wood Opal] Jay Ellis Ransom,1974,Gems and Minerals of America
    [var: Wood Opal] Jay Ellis Ransom,1974,Gems and Minerals of America
    [var: Wood Opal] Jay Ellis Ransom,1974,Gems and Minerals of America
    • Nevada
      • Carson City
        • Delaware District
    [var: Wood Opal] NBMG Spec. Pub. 31 Minerals of Nevada
      • Churchill Co.
    [var: Geyserite] LUTZ, Susan Juch EPISODIC HOT SPRING ACTIVITY AND PALEOSEISMOLOGY OF THE DIXIE VALLEY FAULT IN NORTHERN DIXIE VALLEY, NEVADA GSA Rocky Mountain - 54th Annual Meeting (May 7–9, 2002)
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Dixie Valley District
    Econ Geol (1994) 89:707-719
        • Leete District
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Wild Horse District
    NBMG Spec. Pub. 31 Minerals of Nevada
      • Clark Co.
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Gold Butte District
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Muddy Mts
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
      • Elko Co.
        • Coal Mine District
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
        • Contact District
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
        • Delano District
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Ferber District
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Gold Circle District (Midas District)
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
        • Huntington Creek District
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada; American Mineralogist (1988): 73: 145-152.; USGS Open-File Report 76-56
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada; Am Min 64:3-4 pp 1026-1038; NBMG Open File report 83-9
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    [var: Opal-AN] NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
        • Kinsley District
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
        • Loray District
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    USGS Open-File Report 76-56
        • Mud Springs District
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Pequop District
    NBMG Spec. Pub. 31 Minerals of Nevada
    USGS Bull 1162B
        • Rock Creek District
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
        • Ruby Valley District
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Scraper Springs District
    NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
      • Esmeralda Co.
        • Cuprite District
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Fish Lake Marsh
    [var: Opal-AN] American Mineralogist 19:268-274
        • Fish Lake Valley District
    NBMG Spec. Pub. 31 Minerals of Nevada; Am Min 64:3-4 pp 1026-1038
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Montezuma District
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
        • Red Mountain District
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
        • Silver Peak Range
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Tonopah District
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
    NBMG Bull 78 Geology and Mineral Deposits of Esmeralda County, Nevada
      • Eureka Co.
        • Beowawe District
    NBMG Spec. Pub. 31 Minerals of Nevada; USGS Bull 1998
        • Carlin Trend
          • Maggie Creek Subdistrict
    MinRec 26(5):449-469.
        • Grass Valley
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Lynn District
    [var: Opal-AN] NBMG Spec. Pub. 31 Minerals of Nevada
      • Humboldt Co.
        • Awakening District
    Econ Geol (1994) 89:628-638; USGS Bull 2090
        • Donnelly District
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada
        • National District
    Econ Geol (1985) 80:360-393
        • Opalite District
    NBMG Bull 59 Geology and Mineral Resources of Humboldt County, Nevada
        • Osgood Mts
          • Potosi District
    Min Rec 10:4 pp219-221
        • Rabbit Hole (Sulfur; Sulphur) District
    Adams, George I. The Rabbit Hole Sulphur Mines Near Humboldt House, Nev. In: Contributions to Economic Geology 1903 United States Geological Survey Bulletin 225 Government Printing Office, Washington DC 1904
    Adams, George I. The Rabbit Hole Sulphur Mines Near Humboldt House, Nev. In: Contributions to Economic Geology 1903 United States Geological Survey Bulletin 225 Government Printing Office, Washington DC 1904
        • Santa Rosa Range
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada
        • Sulphur District
          • Sulphur
    Econ Geol (1997) 92:578-600
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG files No. 50600003; Nevada Bureau of Mines and Geology NBMG Open-File Report 96-3 By Stephen B. Castor, Christopher D. Henry, Lisa A. Shevenell
    USGS Bull 1538D
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada; USGS Bull 1538D
    [Precious Opal] Christopher Wentzell
    [Precious Opal] Eckert, Allen W. (1997) The World of Opals. (John Wiley & Sons, New York). p. 312,310.
    USGS Bull 1538D
    Christopher Wentzell collection.
    USGS Bull 1538D
    [Precious Opal] Christopher Wentzell
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada
    [var: Jelly Opal] NBMG Spec. Pub. 31 Minerals of Nevada; Extra Lapis - English No. 10 Opal
    [Precious Opal] USGS Bull 1538D
    USGS Bull 1538D
    USGS Bull 1538D
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada
    [Precious Opal] Christopher Wentzell;
    NBMG Spec Pub 31 Minerals of Nevada
          • WRT Stonetree group
    Christopher Wentzell collection.
    Sinkankas, John (1959) Gemstones of North America. Figure 30 at page 116.
    [Precious Opal] Christopher N. Wentzell
      • Lander Co.
        • Battle Mountain District
    USGS Bull 2009
        • Birch Creek District
    Garside NBMG Bull 81 (1973); Nevada Bureau of Mines and Geology Online Documents OF06-19 - Nevada Uranium and Thorium Occurrences
    Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp303-319.
    Fries, Carl, Jr., Tin deposits of northern Lander County, Nevada. USGS Bulletin 931-L, p. 279-294, illus., 1942.
    NBMG Bull 80 Geology and Mineral Deposits of Lander County, Nevada
    NBMG Bull 80 Geology and Mineral Deposits of Lander County, Nevada
    NBMG Bull 80 Geology and Mineral Deposits of Lander County, Nevada
        • Reese River District
    Jensen, M. and J. Herrmann (2012) Uranium mineralization at the Apex Mine, Lander County, Nevada. Rocks and Minerals 87:270-276
        • Shoshone Mts
    David A. John, Albert H. Hofstra, Robert J. Fleck, Jon E. Brummer, and Eric C. Saderholm (2003)Geologic setting and genesis of the Mule Canyon low-sulfidation epithermal gold-silver deposit, north-central Nevada (in Gold deposits in northern Nevada; Part 1, Regional studies and epithermal deposits). Economic Geology and the Bulletin of the Society of Economic Geologists 98(2):425-463
        • Spencer Hot Springs District
    Williams, S. A. (1988): Pottsite, a new vanadate from Lander County, Nevada. Mineralogical Magazine: 52: 389-390; Mineralogical Magazine 1988 52 : 389-390
      • Lincoln Co.
        • Chief District
    NBMG Bull 73 Geology and Mineral Resources of Lincoln County, Nevada
        • Mormon Mts
          • Mormon Mountains District
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada
    Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp303-319.
      • Lyon Co.
        • Fernley
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Yerington District
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
      • Mineral Co.
    Van King
        • Fitting District
    NBMG Bull 58 Geology and Mineral Resources of Mineral County, Nevada
        • Rawhide District
    NBMG Bull 58 Geology and Mineral Resources of Mineral County, Nevada
        • Red Ridge District
    [var: Wood Opal] NBMG Spec. Pub. 31 Minerals of Nevada
    [var: Wood Opal] NBMG Spec. Pub. 31 Minerals of Nevada
      • Nye Co.
    Rob Lavinsky specimen
    USGS Bull 620D
    NBMG Bull 77 Geology and Mineral Resources of Southern Nye County, Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
    USGS Bull 620D
    USGS Bull 620D
    NBMG Bull 77 Geology and Mineral Resources of Southern Nye County, Nevada
    NBMG Bull 77 Geology and Mineral Resources of Southern Nye County, Nevada
        • Beatty
    Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 558.
        • Gabbs District
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Jackson District
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Manhattan District
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Northumberland District
    MinRec 16(1):37-41.
        • Paradise Peak District
    Econ Geol (1994) 89:1228-1248
    [Precious Opal] NBMG Spec. Pub. 31 Minerals of Nevada
    Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp351-359
          • Tonopah
    [var: Opal-AN] NBMG Spec. Pub. 31 Minerals of Nevada
    [var: Opal-AN] NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada; Nevada Bureau of Mines and Geology NBMG Open-File Report 96-3 By Stephen B. Castor, Christopher D. Henry, Lisa A. Shevenell
      • Pershing Co.
        • Antelope District
          • Lovelock
    [var: Opal-AN] NBMG Spec. Pub. 31 Minerals of Nevada
        • Buena Vista Valley
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Nightingale District
    [var: Opal-AN] Larry J, Garside (1973). Radioactive mineral occurrences in Nevada. p. 94
      • Storey Co.
        • Castle Peak District
    NBMG Bull 70 Geology and Mineral Resources of Washoe and Storey Counties, Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
      • Washoe Co.
    [var: Wood Opal] NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Pyramid District
    NBMG Spec. Pub. 31 Minerals of Nevada; Nevada Bureau of Mines and Geology NBMG Open-File Report 96-3 By Stephen B. Castor, Christopher D. Henry, Lisa A. Shevenell
    NBMG Bull 70 Geology and Mineral Resources of Washoe and Storey Counties, Nevada
    NBMG Bull 70 Geology and Mineral Resources of Washoe and Storey Counties, Nevada
        • Pyramid Lake
    NBMG Spec. Pub. 31 Minerals of Nevada
        • San Emidio District
    NBMG Bull 70 Geology and Mineral Resources of Washoe and Storey Counties, Nevada
    MinRec 16(1):25-31
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Bull 70 Geology and Mineral Resources of Washoe and Storey Counties, Nevada
    [var: Wood Opal] NBMG Spec. Pub. 31 Minerals of Nevada
      • White Pine Co.
    NBMG Spec. Pub. 31 Minerals of Nevada
    • New Hampshire
      • Carroll Co.
        • Albany
    [var: Opal-AN] Rocks & Min. 80:243
    [var: Opal-AN] No reference listed
        • Hale's Location
    [var: Opal-AN] P Cristofono collection, 2010
    [var: Opal-AN] Smith, Art. "New Hampshire: mineral locality index " in Rocks & Min., July-Aug 2005
    [var: Opal-AN]
      • Cheshire Co.
        • Marlow
    [var: Opal-AN] P. Cristofono collection, 2012
        • Walpole
    [var: Opal-AN] P. Cristofono, T. Mortimer, J.W. Nizamoff, A. Wilken, and R. Wilken (2011) The 38th Rochester Mineralogical Symposium, April 14-17, 2011, lecture abstracts, page 17-18.
      • Grafton Co.
        • Bethlehem
    Rocks & Minerals Vol.65 No.4; Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index
        • Groton
    [var: Opal-AN] Whitmore & Lawrence, 2004. The Pegmatite Mines Known As Palermo, p.187
      • Hillsborough Co.
    [var: Opal-AN] P. Cristofono collection 2011
    [var: Opal-AN] P. Cristofono collection
    [var: Opal-AN] P Cristofono collection; P Cristofono collection
    [var: Opal-AN] P Cristofono collection
        • Wilton
    [var: Opal-AN] P. Cristofono collection
      • Merrimack Co.
        • Hooksett
    [var: Opal-AN] P. Cristofono collection 2011
      • Rockingham Co.
        • Fremont
    [var: Opal-AN] P Cristofono collection , 2009
    [var: Opal-AN] P. Cristofono collection, 2012
        • Salem
    [var: Opal-AN] P. Cristofono collection 2011
        • Windham
    [var: Opal-AN] P. Cristofono collection, 2010
      • Strafford Co.
        • Strafford
          • Parker Mountain
    [var: Opal-AN] Rocks & Min.:64:504.; Rocks & Minerals 80:4 pp234-241
      • Sullivan Co.
        • Acworth
    [var: Opal-AN] Jeremy Zolan Collection
    • New Jersey
      • Essex Co.
        • Montclair Township
          • Upper Montclair
    Mins. of NYC & Its Environs, NY Min. Club (1931), Manchester, J.G.; Rocks & Min.: 59-157-183 (1984), Peters, Joseph J.
        • Verona Township
    [var: Opal-AN] The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1, Manchester, J.G. (1931): 96.
      • Hudson Co.
        • Bergen Hill
          • Weehawken
    [var: Opal-AN] The Minerals of New York City and Its Environs, NY Mineralogical Club (1931), Manchester, J.G.; Canfield (1889).
        • Jersey City
          • Mt Pleasant
    [var: Opal-AN] Mins. of NYC & Its Environs, NY Min. Club., Vol. 3 (1931), edited by J.G. Manchester
      • Mercer Co.
        • West Windsor Township
    [var: Opal-AN] The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 88.
      • Middlesex Co.
    The Minerals of NYC & Its Environs, NY Min. Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 71.
      • Morris Co.
        • Mount Olive Township
    [var: Opal-AN] NJ State Geol. Ann. Rpt. (1856):175.
        • Randolph Township
          • Succasunna
    [var: Isopyre] No reference listed
        • Rockaway Township
    The Iron Mines of NJ (1910), Bayley:404; NJ State Geol. Ann. Rpt (1856):197.
      • Passaic Co.
        • Little Falls Township
          • Great Notch
    Mins. of NYC & Environs, NY Min. Club (1931), Manchester.
        • Paterson
    [var: Opal-AN] American Muiseum of Nat. History, NY, specimen(s); Paterson, NJ, Museum specimens; Rocks & Min.: 59:157-183, Peters, Joseph J. (1984).
      • Somerset Co.
        • Bernards Township
    Kent, B.P. and Butkowski, B. (2000): Minerals of the Millington Quarry, Somerset County, New Jersey. Mineralogical Record, 31: 411.
        • Warren Township
    A Quest for New Jersey Minerals, Robert Speiser(1978):10.
      • Sussex Co.
        • Byram Township
          • Cranberry Lake
    [var: Opal-AN] collected by David Bernstein- 10/2009
        • Franklin Mining District
          • Ogdensburg
    Kuitems, Steven, Orosz, Joe, and Nikischer, Tony (2009) Mineral #357 Found at Franklin, NJ, Picking Table v50 (1), p 17.
      • Union Co.
    The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931):94.
      • Warren Co.
        • Franklin Township
    Yale Peabody Museum 3979
    The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1, Manchester, J.G. (1931): 76.
    • New Mexico
      • Bernalillo Co.
    [var: Wood Opal] Minerals of New Mexico 3rd ed.
      • Catron Co.
    Minerals of New Mexico 3rd ed.
    NMGS 37th Field Conference
    NMGS 37th Field Conference
          • Sawmill Creek
    NMGS 37th Field Conference
      • Cibola Co.
        • Laguna District
    NMBMMR Memoir 15 Geology and Technology of the Grants Uranium Region; Moench, Robert Hadley; Schlee, John Stevens (1967) Geology and uranium deposits of the Laguna district, New Mexico. USGS Prof. Paper 519
      • Colfax Co.
        • Springer
          • Point of Rocks Mesa (Pecks Mesa)
    [var: Opal-AN] Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
      • Doña Ana Co.
        • Rincon District
    Minerals of New Mexico 3rd ed.
      • Eddy and Lea Counties
    Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
      • Grant Co.
    Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
    Minerals of New Mexico 3rd ed.
    Minerals of New Mexico 3rd ed.
          • Tyrone Area
    NMBMMR Bull 83 Mineral Deposits of Western Grant County, New Mexico
        • Cap Rock Mountain District
    NMBMMR Bull 83 Mineral Deposits of Western Grant County, New Mexico
    Minerals of New Mexico 3rd ed.
    [Precious Opal] Minerals of New Mexico 3rd ed.
    [var: Fiorite] Minerals of New Mexico 3rd ed.
        • Pinos Altos District
    [var: Opal-AN] Identified on specimens obtained at 2009 Tucson micromount symposium
    Minerals of New Mexico 3rd ed.
        • White Signal District
    [var: Opal-AN] Minerals of New Mexico 3rd ed.
    NMBMMR Bull 83 Mineral Deposits of Western Grant County, New Mexico
      • Hidalgo Co.
    [var: Opal-AN] Minerals of New Mexico 3rd ed.; Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp97-103
    Minerals of New Mexico 3rd ed.
    Minerals of New Mexico 3rd ed.
        • Peloncillo Mts
          • San Simon District
    USGS Prof Paper 68 The Ore Deposits of New Mexico
    Northrop, Minerals of New Mexico, 3rd rev. ed., 1996
    [var: Opal-AN] Minerals of New Mexico 3rd ed.
      • Luna Co.
        • Little Florida Mountains District
    http://www.emnrd.state.nm.us/nmparks/PAGES/parks/rockh/rockh.htm
      • McKinley Co.
    Minerals of New Mexico 3rd ed.
      • Otero Co.
        • Cornudas Mts
    Laszlo Horvath collection
      • Rio Arriba Co.
    Northrop, Minerals of New Mexico, 3rd rev. Ed., 1996
      • San Juan Co.
    Minerals of New Mexico 3rd ed.
      • Sandoval Co.
    [Precious Opal] NMBMMR Bull 81 Summary of the Mineral Resources of Bernalillo, Sandoval, and Santa Fe Counties, New Mexico
    Minerals of New Mexico 3rd ed.
    [var: Opal-AN] Minerals of New Mexico 3rd ed.
    [var: Wood Opal] Minerals of New Mexico 3rd ed.
      • Santa Fe Co.
    NMBMMR Bull 81 Summary of the Mineral Resources of Bernalillo, Sandoval, and Santa Fe Counties, New Mexico
    Minerals of New Mexico 3rd ed.
    Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
    [var: Opal-AN] Minerals of New Mexico 3rd ed.
    NMBMMR New Mexico Mineral symposium (2004)
      • Sierra Co.
    Minerals of New Mexico 3rd ed.; USGS Bull 945C
    The Mineralogist, v. 9, no. 5, p. 181.
        • Paramount Canyon
    [var: Opal-AN] Minerals of New Mexico 3rd ed.
    Minerals of New Mexico 3rd ed.
    [var: Opal-AN] Minerals of New Mexico 3rd ed.
    NMBMMR OFR 19
    Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
    [var: Opal-AN] Minerals of New Mexico 3rd ed.
    [var: Opal-AN] Minerals of New Mexico 3rd ed.
      • Socorro Co.
    [var: Wood Opal] Minerals of New Mexico 3rd ed.
    [var: Opal-AN] Ron Gibbs
    Northrop, Minerals of New Mexico, 3rd Rev. ed., 1996
    Minerals of New Mexico 3rd ed.
    Minerals of New Mexico 3rd ed.
    Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
    [var: Fiorite] Minerals of New Mexico 3rd ed.
      • Taos Co.
        • No Agua District
    Ramon DeMark and Jessie Kline, New Mexico Mineral Symposium, November 2000
    NMBMMR New Mexico Mineral symposium (2000) p.11
    Minerals of New Mexico 3rd ed.
    [var: Opal-AN] The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 84.
      • Broome Co.
        • Deposit
    [var: Opal-AN] Rocks & Min.: 20:61.
      • Essex Co.
        • Crown Point Township
    [var: Opal-AN] Jensen (1978) Minerals of New York State
    John H. Betts (2009) "The minerals of New York City", Rocks & Minerals, 84, 204-240.
        • Manhattan (New York Co.)
          • Manhattan Island
    [var: Opal-AN] Alfredo Petrov, field observations on material displaced during hurricane Irene, August 2011.
      • Orange Co.
        • Town of Warwick
          • Amity
    Glenn Rhein
          • Edenville
            • Edenite Hill
    [var: Opal-AN] Van King
      • Putnam Co.
        • Philipstown Township
          • Anthony's Nose
    [var: Opal-AN] Rocks & Min.:8:61-65.
        • Southeast Township
          • Brewster
    [var: Opal-AN] Januzzi, 1976. Mineral Localities of CT and Southeastern NY State, p223-224
        • Town of Putnam Valley
    [var: Opal-AN] The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 87.
        • Town of Southeast
          • Brewster
    Jensen (1978) Minerals of New York State, 42-43 (Januzzi, 1966, 1989) (Trainer, 1938).
      • St. Lawrence Co.
        • De Kalb Township
          • Bigelow
    Rocks & Minerals 85:250-259
      • Westchester Co.
    [var: Opal-AN] The Minerals of New York City & Its Environs, New York Mineralogical Club Bull., Vol. 3, No. 1, Manchester, J.G. (1931): 65.
    [var: Opal-AN] Rocks & Min.:11:66; 23:712.
    [var: Opal-AN] The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 39 & 45-46.
        • Cortlandt Township
          • Montrose
    Rocks & Min.:8:39.
          • Toddville
    [var: Opal-AN] Rocks & Min.: 7:91; 8:38.
        • Harrison
    [var: Opal-AN] Rocks & Min.: 6:101 & 9:136-137.
        • Peekskill
          • Camp Smith
    [var: Opal-AN] Rocks & Min.: 8:40.
    [var: Opal-AN] Rocks & Min.:7:148 & 8:40.
    [var: Opal-AN] The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 98.
    • North Carolina
    [var: Opal-AN] Genth,Frederick Augustus (1891) The Minerals Of North Carolina;USGS Bulletion No.74
    Gems and Minerals of America-Jay Ellis Ransom-1974
    [var: Opal-AN] Pratt,Joseph Hyde.,(1933) Gems and Gem Minerals of North Carolina: American Mineralogist,Vol.18,No.4,April,1933
      • Clay Co.
    [var: Opal-AN] Pratt,Joseph Hyde.,1933,Gems and Gem Minerals of North Carolina: American Mineralogist: Vol.18,No.4,April,1933
      • Cumberland Co.
        • Fayetteville
    Gems and Minerals of America- Jay Ellis Ransom-1974
      • Macon Co.
        • Cowee Valley
          • Ellijay District
            • Franklin
              • Corundum Hill
    [var: Opal-AN] Ref.: Dana 6:499, 560 & 1077.
      • Madison Co.
        • Mars Hill
    [var: Opal-AN] Rocks & Min.: 17:62
      • Mitchell Co.
        • Cane Creek Section
          • Bakersville
            • Pizzle Mtn
    [var: Opal-AN] Rocks & Min.:11:76-77.
        • Crabtree Falls
          • Crabtree Mountain
    [var: Opal-AN] Rocks & Min.:11:58.
        • Grassy Creek
    [var: Opal-AN] Genth,F.A and Kerr,W.C ,1881,Minerals and Mineral Localities of North Carolina,Geologic Survey, North Carolina
    [var: Opal-AN] Rocks & Min.: 11:58.
    [var: Opal-AN] Genth, Frederick Augustus (1891) The Minerals Of North Carolina: USGS Bulletion No.74
    [var: Opal-AN] U.S Bureau of Mines,Spatial Data Extraction from the Minerals System/Mineral Industry Location System(Mas/Mils)CD-Rom,Sep,1995
        • Spruce Pine District
          • Crabtree Creek
    [var: Opal-AN] Veal,William Brian (2004) Mineralogy Of The Peraluminous Spruce Pine Plutonic Suite,Mitchell,Avery, and Yancey Counties, North Carolina:B.S.,Georgia Southwestern State University
          • Hawk-Bakersville
    [var: Opal-AN] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Opal-AN] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
          • Little Switzerland
    [var: Opal-AN] Rocks & Min.:11:58.
    [var: Opal-AN] Rocks & Min.: 11:57.
          • Penland
    [var: Opal-AN] Michael Streeter,2003,A Rockhounding Guide to North Carolinas Blue Ridge Mountains
    [var: Opal-AN] Rocks & Min.:11:77 & 60:92.
          • Spruce Pine
    [var: Opal-AN] Min Rec 10:1 pp29-30
    [var: Opal-AN] Streeter.Michael.,2003,A Rockhounding Guide to North Carolinas Blue Ridge Mountains.pg#84-85
    [var: Opal-AN] Min Rec 10:1 pp29-30
    [var: Opal-AN] Ross,Clarence S.,(1937) Sphalerite from a Pegmatite near Spruce Pine,North Carolina:The American Mineralogist,May,1937
    [var: Opal-AN] Rocks and Minerals (1985) 60:84-93,99
    [var: Opal-AN] Rocks & Min.: 60:92.
    [var: Opal-AN] Min Rec 10:1 pp29-30
    [var: Opal-AN] Genth,F.A.,1891,The Minerals Of North Carolina:USGS Bulletion No.74
      • Swain Co.
        • Bryson City Feldspar District
    [var: Diatomite] U.S Geological Survey ,2005,Mineral Resources Data System:U.S Geological Survey,Reston,Virginia
    [var: Opal-AN]
        • Hamme Tungsten District
          • Tungsten
    [var: Opal-AN] Ransom,Jay Ellis.,1974,Gems and Minerals of America
      • Yancey Co.
        • Spruce Pine District
          • Burnsville
            • Hurricane Mountain
    [var: Opal-AN] C.W. Allen collection
          • Celo
            • Micaville
    [var: Opal-AN] C.W. Allen collection
          • Crabtree Creek
    [var: Opal-AN] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
            • Seven Mile Ridge
    [var: Opal-AN] Rocks & Min.:11:58.
    • Ohio
      • Franklin Co.
    Minerals of Ohio Bull. 69 ODNR
        • Columbus
    John Krygier specimens
    • Oklahoma
      • Kiowa Co.
        • Lugert
    [var: Opal-AN] R&M 72:4 pp 252-264
    Rocks & Min. vol.72 (1997)
    • Oregon
      • Baker Co.
        • Conner Creek District
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    MacFall, 1951. Gem Hunter's Guide, 1st ed.
    Tschernich, Rudy, 1992, Zeolites of the World
        • Swayze Creek
    Micro Probe Volume VI Number 4
      • Clackamas Co.
        • Clackamas River Localities
    Bill Thompkins
        • Oak Grove Fork
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Columbia Co.
        • Goble
    Micro Probe Vol. 6 No. 5 Fall 1987; Tschernich, R. (1992): Zeolites of the World, 117
      • Crook Co.
        • Howard District (Ochoco District; Bolivar District)
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Deschutes Co.
        • East Lake
    Mineralogy of 10 Geothermal boreholes drilled in and around the Newberry Caldera U.S. Geological Survey Professional Paper, Issue 1578 By Keith E. Bargar, Terry E. C. Keith 1999
      • Harney Co.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Pueblo District (Denio District)
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Jackson Co.
        • Ashland District
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Butte Creek District
    Oregon Metal Mines Handbook, 1943, Oregon Department of Geology and Mineral Industries: Bulletin No. 14-C, Vol. 2, Section 2 - Jackson Co., page 141.
        • Evans Creek District
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Meadows District
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Jefferson Co.
        • Madras
    [var: Opal-AN] K. Volkman personal collection
      • Klamath Co.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Opal-AN] Kleck. W. D. (1970): Cavity Minerals At Summit Rock. American Mineralogist. 55, 1396-1404
      • Lake Co.
    Dake, 1956. NW Gem Trails, 2nd ed.
    [var: Fire Opal] Extra Lapis - English No. 10 Opal
        • Plush
    [var: Opal-AN] O'Neal, C. (2013), Field collection and visual analysis of the Oregon Sunstone deposits near Plush, Lake County, Oregon; March.
    [var: Opal-AN] O'Neal, C. (2013), Field collection and visual analysis of the Oregon Sunstone deposits near Plush, Lake County, Oregon; March.
        • Quartz Mountain
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Malheur Co.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Lake Owyhee State Park
    No reference listed
        • Opalite District (McDermitt District)
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Nevada Bureau of Mines and Geology NBMG Open-File Report 96-3 By Stephen B. Castor, Christopher D. Henry, Lisa A. Shevenell
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Fire Opal] Dake, 1956. NW Gem Trails, 2nd ed.
      • Marion Co.
        • Santiam District (Elkhorn District)
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Morrow Co.
    [var: Opal-AN] USGS
    • Pennsylvania
      • Adams Co.
        • Gettysburg
    Rocks & Minerals 81:229-234
      • Berks Co.
        • Birdsboro
          • Gickerville (Gibralter)
    [var: Opal-AN] The Mineralogy of Pennsylvania 1966-1975; Robert C. Smith II ; pg. 53
      • Delaware Co.
        • Springfield Township
    Rocks & Min.: 59:109-120 & 62:176-178.
      • Lycoming Co.
        • Franklin Township
    Smith and Hoff (1984)
      • Philadelphia Co.
        • Philadelphia
          • Frankford
    [var: Opal-AN] Mineralogy of Pennsylvania-1922; Samuel S. Gordon, pg. 229
    [var: Opal-AN] Mineralogy of Pennsylvania-1922; Samuel S. Gordon, pg. 229
          • Germantown
    [var: Opal-AN] Mineralogy of Pennsylvania, S. G. Gordon - 1922, p. 226.
    [var: Opal-AN] Gordon, 1922. The Mineralogy of Pennsylvania
      • York Co.
    Gems and Minerals of America- Jay Ellis Ransom-1974
    • Rhode Island
      • Bristol Co.
        • Barrington
      • Providence Co.
        • Burrillville
          • Oakland
    [var: Opal-AN] Miller, 1971. RI Minerals & Their Locations
        • Cumberland
    Museum of Natural History, Roger Williams Park, Providence, R.I. G3834 6070
    Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, Ed., University of Rhode Island, Kingston
    [var: Opal-AN] Gems & Minerals 395 (August, 1970).
    Miller, 1972. Rhode Island Minerals
    [var: Opal-AN] Eckert, Allan W. (1997): The World of Opals, p. 346.
        • East Providence
    No reference listed
        • Johnston
    [var: Opal-AN] George, Gilbert (1972). Latest Finds at Rhode Island Road Cuts(Micromounters of New England no. 17, Feb. 1972).
        • Lincoln
          • Lime Rock
    Rocks & Minerals (1986): 61: 286-289
    • South Dakota
    [var: Wood Opal] Jay Ellis Ransom, 1974,Gems and Minerals of America
    [var: Wood Opal] Jay Ellis Ransom, 1974,Gems and Minerals of America
      • Custer Co.
        • Custer District
          • Fourmile
    [var: Opal-AN] Rocks & Minerals: 60: 117.
        • Needles
    R&M 75:3 pp 156-169
      • Lawrence Co.
        • Bald Mountain District
    R&M 75:3 pp 156-169
      • Pennington Co.
        • Harney City
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Keystone District
          • Keystone
    R&M 75:3 pp 156-169
    Rocks & Minerals: 67(6): 380-388.; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    Am Min 70:9-10 pp 1044-1049
        • Scenic
    R&M 75:3 pp 156-169
    SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"
      • Todd Co.
    [var: Wood Opal] Jay Ellis Ransom,1974, Gems and Minerals of America
    [var: Wood Opal] Jay Ellis Ransom,1974, Gems and Minerals of America
    • Tennessee
      • Overton Co.
    Travis A. Paris (2011) Tennessee mineral locality index. Rocks & Minerals, 86, #4, 300-328.
    • Texas
      • Brewster Co.
        • Alpine
    [var: Opal-Agate] www.austingemandmineral.org
    R&M 66:3 pp 196-224; http://www.omsinc.org/archives/Ore-cutts_Jan04.pdf
        • Christmas Mts
    R&M 66:3 pp 196-224
        • Davis Mts
    R&M 66:3 pp 196-224
      • Burnet Co.
    [var: Opal-AN] Personally collected by Franklin Roberts
      • Duval Co.
        • Freer
    R&M 66:3 pp 196-224; R. Maxwell (1962) Mineral Resources of South Texas. UT Bureau of Economic Geology Report of Investigations No. 43
    R&M 66:3 pp 196-224
      • Hudspeth Co.
        • Quitman Mts
    R&M 66:3 pp 196-224
    R&M 66:3 pp 196-224
        • Sierra Blanca Peaks
    Am Min 72:1122-1130
      • Jeff Davis Co.
        • Davis Mts
    R&M 66:3 pp 196-224
      • Karnes Co.
    [var: Opal-Agate] www.wma-minelife.com/uranium/papers/karnes.htm; Cherepon, Alan J., Minerals of the Karnes Uranium District - The Franklin of Texas.
      • Live Oak Co.
        • Ray Point District
    Econ Geol (1986) 81:131-142
      • Llano Co.
    R&M 66:3 pp 196-224
        • Bluffton
    R&M 66:3 pp 196-224
        • Kingsland Granite Company Quarry (Petrick Quarry)
    [var: Opal-AN] Self-collected by Franklin Roberts.
    [var: Opal-AN] Economic Geology; November 1964; v. 59; no. 7; American Mineralogist 50:284
    R&M 66:3 pp 196-224
      • Presidio Co.
    R&M 66:3 pp 196-224
      • Sutton Co.
        • Edwards Plateau
    [Eur.J.Min 13:135-143]
    • Utah
      • Beaver Co.
    [var: Opal-AN] UGMS Bull 117 Minerals and Mineral Localities of Utah
        • Milford
    [var: Opal-AN] Rick Dalrymple
        • Mineral Range
          • Lincoln District
    UGMS Bull 117 Minerals and Mineral Localities of Utah
        • San Francisco Mts
    UGMS Bull 117 Minerals and Mineral Localities of Utah
          • San Francisco District (Frisco District)
            • Frisco
    UGMS Bull 117 Minerals and Mineral Localities of Utah
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Box Elder Co.
        • Crater Island District (Crater Island)
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Hogup Mtns
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Daggett Co.
        • Red Creek (Browns Park)
    [var: Opal-AN] UGMS Bull 117 Minerals and Mineral Localities of Utah; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Uinta Mts
    [var: Opal-AN] UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Emery Co.
        • San Rafael District (San Rafael Swell)
    [var: Opal-AN] Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 992, 1056.; DANA R. KELLEY AND PAUL F. KERR (1958) URANO-ORGANIC ORE AT TEMPLE MOUNTAIN, UTAH. BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA VOL. 69. PP. 701-756.
      • Garfield Co.
        • Dog Valley
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Hatch
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Grand Co.
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Iron Co.
        • Gold Springs District (Hamlin Valley)
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Juab Co.
        • San Pitch Mts
    UGMS Bull 117 Minerals and Mineral Localities of Utah
        • Spor Mountain
    UGMS Bull 117 Minerals and Mineral Localities of Utah; Thurston, W. R.; Staatz, M. H.; Cox, D. C. (1954) Fluorspar deposits of Utah. USGS Bulletin: 1005
    T. Kennedy collection
    UGMS Bull 117 Minerals and Mineral Localities of Utah
    J. Holfert, W. Mroch, J. Fuller (1996) A Field Guide to Topaz and Associated Minerals of the Thomas Range, Utah (Topaz Mountain) Vol I HM Publishing 103pp
          • Starvation Canyon (Searles Canyon)
    Rick Dalrymple Collection
    [var: Opal-AN] UGMS Bull 117 Minerals and Mineral Localities of Utah
    UGMS Bull 117 Minerals and Mineral Localities of Utah; Am.Min.: 45: 39-52
    [var: Opal-AN] Greg Slak specimen
      • Millard Co.
        • House Range
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Piute Co.
        • Antelope Range
          • Henry District (Durkee District)
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Marysvale District (Marysvale Uranium area)
    [var: Opal-AN] UGMS Bull 117 Minerals and Mineral Localities of Utah
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Salt Lake Co.
        • Oquirrh Mts
          • Bingham District (West Mountain District)
    North, Jerry (2010) Displays of Nature : History, Minerals & Crystals of Utah's Bingham Canyon Copper Mine.
    UGMS Bull 117 Minerals and Mineral Localities of Utah
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • San Juan Co.
        • White Canyon District
          • White Canyon
    USGS: Geological Survey Circular 217
      • Sevier Co.
    [var: Opal-AN]
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Tooele Co.
        • Deep Creek Mts
          • Gold Hill District (Clifton District)
            • Gold Hill
    UGMS Bull 117 Minerals and Mineral Localities of Utah; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    UGMS Bull 117 Minerals and Mineral Localities of Utah
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    UGMS Bull 117 Minerals and Mineral Localities of Utah; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    UGMS Bull 117 Minerals and Mineral Localities of Utah; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Grassy Mts
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Lakeside Mts
    [var: Diatomite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Oquirrh Mts
          • Bingham District (West Mountain District)
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
        • Stansbury Island
    [var: Diatomite] Tripp, B.T. (1980), On-site Investigation, Utah Geologic and Mineral Survey; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10087547.
    • Virginia
      • Albemarle Co.
        • Stony Point
    Minerals of Virginia 1990 by R. V. Dietrich
      • Amelia Co.
    Minerals of Virginia 1990 by R. V. Dietrich
        • Winterham
    [var: Opal-AN] Mike Dennis specimens
      • Augusta Co.
        • Parnassus
    Rocks & Minerals 84:352-362.
      • Botetourt Co.
        • Buchanan
    Rocks & Min.:60:165.
      • Clarke Co.
    Minerals of Virginia 1990 by R. V. Dietrich
      • Culpeper Co.
        • Mitchell
    [var: Opal-AN]
        • Rapidan
    Minerals of Virginia 1990 by R. V. Dietrich
    [var: Opal-AN] Gems and Minerals of America-Jay Ellis Ransom-1974
        • Culpeper Basin
    Minerals of Virginia 1990 by R. V. Dietrich
      • Hanover Co.
    [var: Wood Opal] Minerals of Virginia 1990 by R. V. Dietrich
      • Henrico Co.
        • Richmond
    [var: Opal-AN] Minerals of Virginia 1990 by R. V. Dietrich
      • Henry Co.
    [var: Opal-AN] Minerals of Virginia 1990 by R. V. Dietrich
      • King George Co.
    Minerals of Virginia 1990 by R. V. Dietrich
      • Loudoun Co.
        • Conklin
    [var: Opal-AN] Minerals of Virginia 1990 by R. V. Dietrich
        • Leesburg
    [var: Opal-AN] Minerals of Virginia 1990 by R. V. Dietrich
    [var: Opal-AN] Minerals of Virginia 1990 by R. V. Dietrich
      • Louisa Co.
        • Gold-Pyrite Belt
    Lance E. Kearns and Michael D. Dunn (2008) Mineral News, 24, #8, 1-6.
      • Lunenburg Co.
    [var: Opal-AN] Minerals of Virginia 1990 by R. V. Dietrich
    Holland, J. D. (2006) Virginia Lithic Types: Chert, quartzite and Others. Quarterly Bulletin Virginia Archeological Society 61:137-152
    Minerals of Virginia 1990 by R. V. Dietrich
        • Flat Rock
    [var: Opal-AN] Minerals of Virginia 1990 by R. V. Dietrich
      • Prince William Co.
        • Manassas
    Minerals of Virginia 1990 by R. V. Dietrich
      • Richmond (City)
    Minerals of Virginia 1990 by R. V. Dietrich
      • Roanoke Co.
    [var: Opal-AN] Minerals of Virginia 1990 by R. V. Dietrich
      • Wise Co.
    Minerals of Virginia 1990 by R. V. Dietrich
    Minerals of Virginia 1990 by R. V. Dietrich
    • Washington
      • Benton Co.
    Tschernich, R. (1992): Zeolites of the World, p. 120
      • Clark Co.
        • Orchards
    Zeolites of the World by Rudy Tschernich pg. 481; Bill Tompkins collection
      • Douglas Co.
    Tschernich (1991): Zeolites of Washington State. Rock & Minerals, 66(4); American Mineralogist, Volume 67, pages 799-803, 1982
      • Grant Co.
    Minerals of Washington, Bart Cannon, 1975
      • King Co.
    Karl Volkman Personal Collection
      • Kittitas Co.
    [var: Wood Opal] http://www.mineralcouncil.org/
      • Klickitat Co.
        • Roosevelt
    Minerals of Washington, Bart Cannon, 1975
      • Lewis Co.
        • Morton District
          • Glenoma
    Cannon, B. (1975): Minerals of Washington, p.74
    Cannon, B. (1975): Minerals of Washington, p.74
    Cannon, B. (1975): Minerals of Washington, p.74
          • Morton
    Minerals of Washington, Bart Cannon, 1975
      • Lincoln Co.
    [var: Opal-AN] Dake, 1956. NW Gem Trails, 2nd ed.
      • Skagit Co.
        • Mount Vernon
    American Mineralogist 28:257-271
      • Spokane Co.
        • Spokane
    Rocks & Min.:8:30.
      • Whitman Co.
    Micro Probe Volume VII Number 9 Spring 1994
        • Pullman
    Minerals of Washington, Bart Cannon, 1975
        • Whelan
    Minerals of Washington, Bart Cannon, 1975
    • West Virginia
      • Monongalia Co.
    West Virginia Geological & Economic Survey
    • Wisconsin
      • Dodge Co.
        • Iron Ridge District (Neda Iron District)
    Rocks & Min. Vol. 73 (1998)
    Mineralogy of Wisconsin By William S. Cordua, When iron was king in dodge county by George G. Frederick
    Minerology of Wisconsin by William S. Cordua and When Iron was King in Dodge County by George G. Frederick
      • Florence Co.
        • Fern
    [var: Opal-AN] The Mineralogy and Geochemistry of the Animikie Red Ace Pegmatite, Florence County, Wisconsin. Alexander U. Falster, Wm. B. Simmons, and Karen L. Webber, Recent Research Developments in Mineralogy, 1(1996)
      • Marathon Co.
        • Rib Mountain
    [var: Opal-AN] [MinRec 12:95]; Rocks and Minerals, (1987) 62:188-195
        • Wausau pluton
    Rocks & Min.: 62: 188.
    • Wyoming
    [var: Wood Opal] Jay Ellis Ransom,1974, Gems and Minerals of America
      • Carbon Co.
    Personal Collection of Matthew Neuzil
      • Fremont Co.
        • Gas Hills District
    Am Min 51:1567-1578
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    Yale Peabody Museum
    [var: Geyserite] Economic Geology; November 1972; v. 67; no. 7; p. 965-972
          • Grand Canyon of the Yellowstone
    2009 Portland GSA Annual Meeting (18-21 October 2009) Paper No. 26-23
      • Teton Co.
        • Moran
    [var: Opal-AN] Iddings, J P and S L Penfield "The Minerals in Hollow Spherulites of Rhyolite from Glade Creek, Wyoming" American Journal of Science Vol 42 No 247 (1892) pp. 39-46
    Uzbekistan
     
    • Kyzylkum Desert
      • Central Kyzylkum Region
        • Bukantau Mts
    [var: Mother of Pearl Opal] Pechenkin, V.G., and Pechenkin, I.G. (2005): Lithology and Mineral Resources 40(5), 462-471.
        • Lyavlyakan-Beshkak ore field
    Solodov, I.N., Nesterova, M.V., Shugina, G.A., Ganina, N.I., Shulik, L.S., and Solodov, D.I. (2001): Lithology and Mineral Resources 36(1), 43-62.
    • Tashkent Viloyati (Toshkent)
    Golovanov, I. M.: O nachodke chantita v mestorožděnii Kurgašinkan (UzSSR). Doklady Akademii nauk SSSR, 1959, tom. 124, no. 2, s. 398 - 401.
    Vanuatu (Republic of Vanuatu; New Hebrides)
     
    • Tanna Is
    [var: Opal-AN] R. Martin personal collection
    Venezuela
     
    • Amazonas
    Urbani, 1997. Bol. Soc. Venezolana de Espeleología, no.30.
    • Bolívar
      • Auyán-tepuy
    BOLETÍN INFORMATIVO DE LA COMISIÓN DE GEOESPELEOLOGÍA (Federación Espeleológica de América Latina y el Caribe -FEALC-) No. 13, Octubre 1999
      • Chimantá Massif (Chimantha Massif)
    Galli, E., Brigatti, M.F., Malferrari, D., Sauro, F., De Waele, J. (2013): Rossiantonite, Al3(PO4)(SO4)2(OH)2(H2O)10•4H2O, a new hydrated aluminum phosphate-sulfate mineral from Chimanta massif, Venezuela: Description and crystal structure. American Mineralogist, 98, 1906-1913.
    • Miranda
    Urbani, F. (1996). Venezuelan Cave Minerals: A Review. Bol. Soc. Venezolana de Espeleología, No. 30
    Franco Urbani (2009) Venezuelan Cave Minerals: Second Review. Mineralogy 1 2009 ICS Proceedings. In 15th International Congress of Speleolog