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Silica is the trivial name for the chemical compound silicon dioxide, SiO2. The term silica comprises all polymorphs of silicon dioxide. In geoscience literature, the term silica also includes silicic acid, H4SiO4, which forms when silica polymorphs and silicate minerals are dissolved in water.

Two groups of silica polymorphs can be distinguished by their molecular structure:
1. Polymorphs that are made of SiO4 tetrahedra: α-quartz, β-quartz, moganite, α-tridymite, β-tridymite, α-cristobalite, β-cristobalite, keatite, coesite and silica glass (lechatelierite) are pure silica polymorphs. Opal-AG, opal-AN, opal-C, opal-CT, melanophlogite and chibaite are silica polymorphs that contain impurities. Structurally, all these polymorphs are network silicates.
2. High-pressure polymorphs in which each silicon atom is surrounded by six oxygen atoms: stishovite and seiferite. Since these polymorphs are not made of SiO4 tetrahedra, they are not structurally related to silicates.

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Varieties of SilicaHide

Float-stoneA coarse, porous, friable variety of impure silica, comprised chiefly of the siliceous skeletons of infusoria.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hapkeite1 photo of Silica associated with Hapkeite on
Troilite1 photo of Silica associated with Troilite on

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Silica in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for SilicaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sosman, R.B. (1927) The Properties of Silica. 856 pp., New York.
Rogers, Austin Flint (1928), Natural history of the silica minerals: American Mineralogist: 13: 73-92;
Cartz, L. (1964) An X-ray diffraction study of the structure of silica glass. Zeitschrift für Kristallographie: 120: 241-260.
Robinson, H.A. (1965) On the structure of vitreous SiO2. I. A new pentagonal dodecahedral model. Journal Phys. Chem. Solids: 26: 209-222.
Henninger, E.H., Buschert, R.C., and Heaton, L. (1967) Atomic structure and correlation in vitreous silica by x-ray and neutron diffraction. Journal Phys. Chem. Solids: 28: 423-432.
Hicks, J.F.G. (1967) Structure of silica glass. Scence: 155: 459-461.
Kushiro, I. (1969), The system forsterite-diopside-silica with and without water at high pressures: American Journal of Science: 267: 269-294.
Mozzi, R.L. and Warren, B.E (1969) The structure of vitreous silica. Journalm of Applied Crystallography: 2: 164-172.
Bell, R.J. and Dean, P. (1972) The structure of vitreous silica: validity of the random network theory. Phil. Magazine: 25: 1381-1398.
Konnert, J.H. and Karle, J. (1972) Tridymite-like structure in silica glass. Nature Phys. Sci.: 236: 92-94.
Narten, A.H. (1972) Diffraction pattern and structure of non-crystalline BeF2 and SiO2 at 25°C. Journal Chem. Phys.: 56: 1905-1909.
Konnert, J.H. and Karle, J. (1973a) Crystalline ordering in silica and germania glasses. Science: 179: 177-179.
Konnert, J.H., Ferguson, G.A., and Karle, J. (1974) Structure of silica glass: rebuttal. Science: 184: 93.
Da Silva, J.R.G.D., Pinatti, D.G., Anderson, C.E., and Rudee, M.L. (1975) A refinement of the structure of vitreous silica. Phil. Magazine: 31: 713-717.
Yip, K.L. and Fowler, W.B. (1975) Electronic structure of E1' centers in SiO2. Physics Review B: B11: 2327-2338.
Gaskell, P.H. and Tarrant, I.D. (1980) Refinement of a random network model for vitreous silicon dioxide. Phil. Magazine: B42: 265-286.
Herms, G. and Steil, H. (1980) The pentagonal dodecahedral model of vitreous silica and its compatibility with diffraction experiments. Krist. Tech.-Cryst. Res. Tech.: 15: 879-884.
Konnert, J.H., D'Antonio, P., and Karle, J. (1982) Comparison of radial distribution function for silica glass with those for various bonding topologies: use of correlation function. Journal of Non-Crystalline Solids 53: 135-141.
Richet, P., Bottinga, Y., Deniélou, L., Petitet, J.P., and Téqui, C. (1982) Thermodynamic properties of quartz, cristobalite, and amorphous SiO2: drop calorimetry measurements between 1000 and 1800 K and a review from 0 to 2000 K. Geochimica et Cosmochmica Acta: 46: 2639-2658.
Jani, M.G., Bossoli, R.B., and Halliburton, L.E. (1983) Further characterization of the E1' center in crystalline SiO2. Physics Review: B 27: 2285-2293.
Johnson, P.A.V., Wright, A.C., and Sinclair, R.N. (1983) Neutron scattering from vitreous silica. II. Twin-axis diffraction experiments. Journal of Non-Crystalline Solids: 58: 109-130.
Smith, J.V. and Blackwell, C.S. (1983) Nuclear magnetic resonance of silica polymorphs. Nature: 303: 223-225.
Dupree, E. and Pettifer, R.F. (1984) Determination of the Si-O-Si angle distribution in vitreous silica by magic angle spinning NMR. Nature: 308: 523-525.
Coombs, P.G., De Natale, J.F., Hood, P.J., McElfresh, D.K., Wortman, R.S., and Shackelford, J.F. (1985) The nature of the Si-O-Si bond angle distribution in vitreous silica. Phil. Magazine: B51: L39-L42.
Gupta, R.P. (1985) Electronic structure of crystalline and amorphous silicon dioxide. Physical Review: B32: 8278-8292.
Galeener, F.L. and Wright, A.C. (1986) The J.C. Phillips model for vitreous SiO2: a critical appraisal. Solid State Commun.: 57: 677-682.
Gerber, T. and Himmel, B. (1986) The structure of silica glass. Journal of Non-Crystalline Solids: 83: 324-334.
Goodman, C.H.L. (1986) The structure of silica glass and its surface. Phys. Chem. Glasses: 27: 27-31.
Kusabiraki, K. (1987) Infrared and Raman spectra of vitreous silica and sodium silicates containing titanium. Journal of Non-Crystalline Solids: 95-96: 411-418.
Galeener, F.L. (1988) Current models for amorphous SiO2. In: The Physics and Technology of Amorphous SiO* (R.A.B. Devine, ed.) Plenum Press, New York, NY.
Griscom, D.L. (1989) Self-trapped holes in amorphous silicon dioxide. Physics review: B 40: 4224-4228.
Gladden, L.F. (1990b) Medium-range order in v-SiO2. Journal of Non-Crystalline Solids: 119: 318-330.
Guttman, L. (1990) Ring structure of the crystalline and amorphous forms of silicon dioxide. Journal of Non-Crystalline Solids: 116: 154-147.
Marians, C.S. and Burdett, J.K. (1990) Geometric constraints: a refined model for the structure of silica glass. Journal of Non-Crystalline Solids: 124: 1-21.
Marians, C.S. and Hobbs, L.W. (1990) Local structure of silica glasses. Journal of Non-Crystalline Solids: 119: 269-282.
Young-nian, X. and Ching, W.Y. (1991) Electronic and optical properties of all polymorphic forms of silicon dioxide. Physical review: B44: 11048-11059.
Leko, V.K. (1993) The structure of vitreous silica. Glass Phys. Chem.: 19: 351-374.
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.
Wright, A.C. (1994) Neutron scatterng from vitreous silica. V. The structure of vitreous silica: what have we learned from 60 years of diffraction studies? Journal of Non-Crystalline Solids: 179: 84-115.
Di Pomponio, A., Continenza, Lozzi, A.A., Passacantando, L., Santucci, M., and Picozzi, P. (1995) Electronic properties of crystalline and amorphous SiO2 investigated via all-electron calculations and photoemission spectroscopy. Solid State Communications: 95: 313-317.
LeBail, A. (1995) Modelling the silica glass structure by the Rietveld method. Journal of Non-Crystalline Solids: 183: 39-42.
Gaskell, P.H. and Wallis, D.J. (1996) Medum-range order in silica, the canonical network glass. Phys. Rev. Lett.: 76: 66-69.
MAuri, F., Pasquarello, A., Pfrommr, BG., Yoon, Y.-G., and Louie, S.G. (2000) Si-O-Si bond-angle distribution in vitreous silica from first principles 29Si NMR analysis. Phys. Rev.: B62: R4786-R4789.
Nakamura, M., Arai, M., Otomo, T., Inamura, Y., and Bennington, S.M. (2001) Dispersive excitation in different forms of SiO2 Journal of Non-Crystalline Solids: 293-295: 377-382.
Nakamura, M., Arai, M., Inamura, Y., and Otomo, T. (2003) Dynamical properties of vitreous silica around the first sharp diffraction peak. Phys. Rev.: B67: 064204.
Clark, T.M., Grandinetti, P.J., Florian, P., and Stebbins, J.F. (2004) Correlated structural distributions in silica glass. Phys. Rev.: B70: 064202.
Tucker, M.G., Keen, D.A., Dove, M.T., and Trachenko, K. (2005) Refinement of the Si-O-Si angle distribution in vitreous silica. Journal Phys. Condens. Matter: 17: S67-S75.
Uchino, T., Harrop, J.D., Taraskin, S.N., and Elliott, S.R. (2005) Real and reciprocal space structural correlations contributing to the first sharp diffraction peak in silica glass. Phys. Rev.: B71: 014202.

Internet Links for SilicaHide

Significant localities for SilicaHide

Showing 230 significant localities out of 82,550 recorded on

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Ghazni Province (Gazni Province)
    • Muqur District
[Quartz] Ikram Mineralogy
  • Tucumán
    • Graneros Department
      • Cerro Quico
[Quartz var: Citrine] Raúl Jorge Tauber Larry´s collection.
  • New South Wales
    • Clive Co.
      • Torrington
[Quartz var: Citrine] Patrick Gundersen
    • Finch Co.
      • Lightning Ridge
[Opal var: Shell Opal] - Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
  • South Australia
    • Mt Lofty Ranges
      • South Mt Lofty Ranges (Adelaide Hills)
        • Ashton
[Quartz] Bottrill (unpub)
  • Tasmania
    • Central Coast Municipality
[Quartz var: Smoky Quartz] M Latham collection
    • Dorset municipality
[Quartz var: Smoky Quartz] Bottrill, R.S. & Baker, W.E. (2008) A Catalogue of the Minerals of Tasmania. Bull. 73. Tasmanian Geological Survey
[Quartz] R Bottrill, unpub data; Bottrill, R.S. & Baker, W.E. (2008) A Catalogue of the Minerals of Tasmania. Bull. 73. Tasmanian Geological Survey
  • Victoria
    • Alpine Shire
[Jasper var: Darlingite] Trans. R. Soc. Victoria, 1866, VII, 80; Proc. R. Soc. Victoria, 1897, N.S. IX, 86
  • Carinthia
    • Hohe Tauern
      • Ankogel group
        • Ankogel area
[Quartz] Rudolf Hasler Collection
[Quartz var: Rock Crystal] G. Niedermayr: Carinthia II 184./104.:254-255 (1994)
[Quartz var: Rock Crystal] G. Kandutsch, M. Wachtler (2000) Die Kristallsucher. Band2; Christian Weise Verlag, München.
        • Mallnitz
[Quartz var: Rock Crystal] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
        • Seebach valley
[Quartz var: Rock Crystal] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
      • Goldberg group
        • Große Fleiß valley
          • Hocharn
[Quartz var: Smoky Quartz] Wachtler, Kandutsch, Die Kristallsucher, Christian Weise Verlag, Bozen 2000
[Quartz var: Smoky Quartz] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
[Quartz] Rudolf Hasler; Rudolf Hasler Collection
[Quartz var: Rutilated Quartz] Rudolf Hasler Collection
        • Zirknitz
          • Große Zirknitz valley
[Quartz var: Amethyst] Kandutsch, Wachtler (2000), Die Kristallsucher, Band 2, Athesiadruck Bozen
      • Reißeck group
        • Pusarnitz
[Quartz var: Amethyst] Dr. H. Weninger (1976) Mineral-Fundstellen Steiermark und Kärnten
    • Koralpe
      • Steinweißwald
[Quartz var: Rock Crystal] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
  • Styria
    • Koralpe
      • Deutschlandsberg
        • Warnblick
          • Schwemmhoisl farm
[Quartz] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
  • Luxembourg Province
    • Bastogne
[Quartz var: Rock Crystal] Harjo Neutkens collection
  • Walloon Brabant Province
    • Rebecq
      • Bierghes
[Quartz var: Rock Crystal] Hatert, F., Deliens, M., Fransolet, A.-M. & van der Meersche, E. (2002): Les minéraux de Belgique. 2ème édition, Muséum des Sciences Naturelles, Bruxelles, Ed., 304 p.
      • Quenast
[Quartz] Hatert, F., Deliens, M., Fransolet, A.-M. & van der Meersche, E. (2002): Les minéraux de Belgique. 2ème édition, Muséum des Sciences Naturelles, Bruxelles, Ed., 304 p.
  • Cochabamba Department
    • Ayopaya Province
[Quartz] Collections of Alfredo Petrov and Dr. Jaroslav Hyrsl.
  • Minas Gerais
    • Galiléia
      • Laranjeiras
[Quartz var: Rose Quartz] Natural History Museum Vienna collection
  • Manitoba
[Quartz] Ann P. Sabina Rocks and Minerals for the collector 1991
  • Nova Scotia
    • Guysborough Co.
[Quartz] Robinson, G.W., et al., "What's New in Minerals", Mineralogical Record, vol. 23, no. 5, pp. 428, Sept-Oct 1992.
  • Nunavut
    • Baffin Island
      • Nanisivik
[Quartz] [MinRec 21:533]; Dennis C. Arne, L. W. Curtis, S. A. Kissin (1991) Internal zonation in a carbonate-hosted Zn-Pb-Ag deposit, Nanisivik, Baffin Island, Canada. Economic Geology ; 86 (4): 699–717.
  • Ontario
    • Hastings Co.
      • Carlow Township
[Quartz var: Amethyst] Matthew Neuzil Collection
    • Thunder Bay District
      • McTavish Township
[Quartz] Ontario Gem Company
  • Jiangsu Province
    • Nanjing Prefecture
[Chalcedony var: Agate] Rob Woodside collection
  • Boyacá Department
    • Vasquez-Yacopí Mining District
      • Mun. de San Pablo de Borbur
  • Guayas Province
    • Guayaquil Canton
      • Guayaquil
        • Pascuales
          • La Germania
[Quartz var: Prase] Alejandro Félix Gutiérrez
  • Auvergne-Rhône-Alpes
    • Haute-Savoie
      • Chamonix
[Quartz] G. Signorelli
    • Loire
      • Montbrison
        • Essertines-en-Châtelneuf
[Quartz var: Smoky Quartz] F. Gonnard (1906) - Minéralogie des départements du Rhône et de la Loire, pp: 6 & 36
[Quartz var: Smoky Quartz] F. GONNARD (1906) - Minéralogie des départements du Rhône et de la Loire
    • Puy-de-Dôme
      • Jumeaux
        • La Chapelle-sur-Usson
[Quartz var: Amethyst] 207433; Jonathan Plasse collection S. Berger Collection
    • Rhône
      • Beaujeu
        • Les Ardillats
[Quartz] Favreau G., Legris J-R., Dardillac M. (1996), La Verrière (Rhône): Histoire et Minéralogie, Le Cahier des Micromonteurs, n°3, pp:3-28
  • Grand Est
    • Ardennes
      • Charleville-Mézières
[Quartz] Harjo
    • Bas-Rhin
      • Bruche valley (Breuch valley)
        • Schirmeck
[Quartz] Alain Steinmetz and Thierry Brunsperger Collection
      • Villé Valley
        • Urbeis
[Quartz] Aufschluss 1/85
  • Provence-Alpes-Côte d'Azur
    • Alpes-de-Haute-Provence
[Quartz] Rostan P. (2002), Cristaux de quartz d'habitus fenestré dans les Alpes du Sud, Le Règne Minéral, n°45, pp: 5-17
    • Hautes-Alpes
      • Gap
[Quartz] Thierry JEAN
    • Var
      • Tanneron
[Quartz] Mari G., Consorti A. (2004), Les filons de fluorite de la mine de Maraval (Var), Le Règne Minéral, 60, 20-25
  • Heves Co.
    • Mátra Mts
      • Gyöngyössolymos
  • Co. Cork
    • Mizen Peninsula
      • Ballydehob
        • Audley Mines
[Quartz] Barry Flannery (Personal Communication)
  • Co. Galway
    • Renville
[Quartz] O’Reilly, C., Feely, M., McArdle, P., Mc Dermot, C. Geoghegan, M. & Keary, R. (1997). Mineral localities in the Galway Bay Area. Geol. Surv. Ireland. Special Report Series. RS/97/1(Mineral Resources) ISSN0790-0279, 70p. & 1:150,000 Geological and Mineral Localities Map of the Galway Bay Area.
  • Co. Mayo
    • Achill Island
[Quartz var: Amethyst] Nicholson, A. (1847). Ireland's welcome to the stranger: or An excursion through Ireland, in 1844 & 1845, for the purpose of personally investigating the condition of the poor. By A. Nicholson. Baker and Scribner.
  • Co. Sligo
    • Aughamore
[Quartz] Barry Flannery collection
    • Ballysadare
[Quartz] Stephen Moreton
  • Co. Tipperary
    • Silvermines District
[Quartz] Moreton, S. (1999) Mineralogical Record, 30, 99-106. Barry Flannery (Personal Observation)
  • Aosta Valley
    • Courmayeur
      • Monte Bianco Massif (Mont Blanc Massif)
        • Veny Valley
  • Emilia-Romagna
    • Bologna Province
      • Reno Valley
        • Alto Reno Terme
[Quartz] Natural History Museum Vienna Collection
    • Parma Province
      • Medesano
        • Sant'Andrea Bagni
[Opal] Adorni, F., Tateo, F., Adorni, B. (2004): La melanoflogite di Case Montanini (S. Andrea Bagni, Medesano, Appennino parmense). Rivista Mineralogica Italiana, 28, 126-136.
  • Lombardy
    • Bergamo Province
      • Seriana Valley
[Quartz] De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol.
  • Piedmont
    • Cuneo Province
      • Gesso Valley
        • Valdieri
          • Terme di Valdieri
[Quartz var: Amethyst] Piccoli, Maletto, Bosio, Lombardo - Minerali del Piemonte e della Valle d'Aosta - Gian Carlo Piccoli editore 2007
  • Sardinia
    • Sassari Province
      • Osilo
[Quartz var: Amethyst] No reference listed
  • Tuscany
    • Livorno Province
      • Elba Island
        • Campo nell'Elba
          • San Piero in Campo
[Quartz] Alessandro Genazzani collection
[Quartz] Barsotti, G., & Nannoni, R. (2006). Rocce, minerali e miniere delle isole dell'Arcipelago Toscano. Pacini editore, 152 pp.; F. Millosevich (1914) - I 5000 Elbani del Museo di Firenze - R. Ist. Studi Sup. Prat. Perf. Firenze; Giuliano bettini collection
          • Sant'Ilario in Campo
    • Lucca Province
      • Apuan Alps
        • Minucciano
          • Gorfigliano
[Quartz] Orlandi P., Dini A., Gemignani E., Pierotti L., Quilici U., Romani U., 2002. Paragenesi alpine nelle Alpi Apuane: I minerali delle vene di quarzo della Valle dell'Acqua Bianca, Gorfigliano (LU) Riv. Mineral. It., 26, 4: 216-223
        • Pietrasanta
          • Valdicastello Carducci
[Quartz var: Smoky Quartz] Baldi M., 1982. La miniera del Pollone a Valdicastello. Riv. Miner. Ital., 6: 46-58.
    • Massa-Carrara Province
      • Apuan Alps
[Quartz] Aloisi, P. (1909) Il quarzo dei marmi di Carrara. Atti della Società Toscana de Scienze Naturali di Pisa: 25: 87-125. Orlandi P., Franzini M. (1994) I minerali del marmo di Carrara. Amilcare Pizzi S.p.A., Milano. Orlandi, P. & Criscuolo, A. (2009) Minerali del marmo delle Alpi Apuane. Pacini editore, Pisa, 180 pp.
[Quartz var: Amethyst] MinRec 31:4 and opening spread
    • Mun. de Zumpango del Rio
[Quartz var: Amethyst] Min Rec 35:6 pp29-37
  • Hidalgo
    • Mun. de Pachuca
[Cristobalite] vom Rath (1887) Neues Jahrb. Min. Bd 1 p 198
  • Erongo Region
    • Brandberg Area
      • Messum Igneous Complex
[Quartz var: Amethyst] Peter Seroka collection
  • Vestfold
    • Holmestrand
      • Kjeksrød
[Quartz var: Amethyst] Nordrum, F.S., Larsen, A.O., Bergstrøm, T. & Larsen, S. (1997): Die Zeptheramethyste von Holmestrand. Mineralien Welt. 8 (4): 45-50
  • Ancash Department
    • Bolognesi Province
      • Huallanca District
        • Huallanca
[Quartz] Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.; Econ Geol (1985) 80:416-478
    • Pallasca Province
      • Pampas District
[Quartz] Mineralogical Record 28, No. 4 (1997); collections of Rock Currier, Jack Crowley, Jaroslav Hyrsl and Alfredo Petrov.; Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.; Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.
    • Recuay Province
      • Ticapampa District
[Quartz] Mi.Rec. 28, no.4 (1997)
  • Viana do Castelo District
    • Ponte da Barca
      • São Lourenço de Touvedo
[Quartz] Leal Gomes, C., Azevedo, A., Lopes Nunes, J., & Dias, P. A. (2009). Phosphate fractionation in pegmatites of Pedra da Moura II claim–Ponte da Barca–Portugal. Estudos Geológicos, 19(2), 172.
  • Far-Eastern Region
    • Primorskiy Kray
      • Kavalerovo Mining District
[Quartz] Amir Akhavan
  • Urals Region
    • Middle Urals
[Quartz] [World of Stones 2:93]; Pavel M. Kartashov data
      • Sverdlovskaya Oblast'
        • Ekaterinburg (Sverdlovsk)
          • Berezovskii (Berezovskii Zavod)
[Quartz var: Rock Crystal] [World of Stones 2/93 p.35]
  • Košice Region
    • Rožňava Co.
      • Dobšiná (Dobschau; Topschau)
[Chalcedony var: Agate] Ozdín D. & Števko M., 2010: Unikátny výskyt achátov v serpentinizovaných peridotitoch v Dobšinej. Minerál, 18, 4, 331-335.
  • Trenčín Region
    • Partizánske Co.
      • Veľký Klíž
[Quartz] Slavomír ŠIMKO
  • Škofja Loka
[Quartz] Matija Vukovski Collection
  • Canary Islands
    • Las Palmas Province
      • Gran Canaria (Grand Canary)
[Mogánite] American Mineralogist, volume 070, pp. 874(1985)
  • Castile and Leon
    • Salamanca
      • Villasbuenas
[Quartz var: Citrine] Arroyo, A. and Calvo, M. (1995). El cuarzo citrino de Villasbuenas (Salamanca). Revista de minerales. 1: 86-89.
  • Valencian Community
    • Valencia
      • Chella
[Quartz] Calvo, M. (2016). Minerales y Minas de España. Vol VIII.Cuarzo y otros minerales de la sílice. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 399 págs.
      • Chelva
        • Domeño
[Quartz] Casanova Honrubia, Juan Miguel & Canseco Caballé, Manuel, 2002, Minerales de la Comunidad Valenciana : 237 p. Ed. Caja de Ahorros del Mediterráneo. Alicante
  • Grischun (Grisons; Graubünden)
    • Vorderrhein Valley
      • Tujetsch (Tavetsch)
[Quartz] Jahn, S. (2004) Klassische Weltfundstelle: Val Giuv. Mineralien Welt, 15 (1): 34-61
  • Nakhon Ratchasima Province (Khorat Province)
    • Nakhon Ratchasima District
[Opal] C. Lemanski, Jr. (visited, collected & photographed).
  • Marmara Region
    • Istanbul Province
[Chalcedony] Agricola (1546) De Natura Fossilium, p. 466
  • Wales
    • Caerphilly
      • Risca
[Chalcedony] No reference listed
  • Alaska
    • Prince of Wales-Outer Ketchikan Borough
      • Ketchikan District
        • Prince of Wales Island
[Quartz] Min Rec 35:5 pp383-404, 419-420
  • Arizona
    • Coconino Co.
      • Winslow
        • Meteor Crater area
[Coesite] Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 180; Chao, E.C.T., et al (1960), First natural occurrence of coesite, Science: 132: 220-222.
  • California
    • Calaveras Co.
      • Valley Springs area
[Quartz] Jake Harper: Field work, 1990 - 2110.
    • San Luis Obispo Co.
      • Santa Lucia Mts (Santa Lucia Range)
        • San Simeon
[Quartz] Ron Layton collection
  • Colorado
[Chalcedony] Personally collected by Donald Gilbert Garcia in 2016
    • Ouray Co.
      • San Juan Mts
        • Ouray District
          • Ouray
            • "Amphitheater" glacial cirque
[Quartz var: Milky Quartz] Minerals of Colorado (1997) E.B. Eckels
  • Connecticut
    • Hartford Co.
      • Avon
[Quartz] Rowan M. Lytle; Harold Moritz collection
      • Canton
        • Rattlesnake Mountain
[Quartz var: Amethyst] Kenneth Holt specimen (locality info corrected courtesy of John Betts); Mineralogical Record (1990) 21:203-213; Rocks & Minerals (1995) 70:396-409
      • East Granby
[Quartz] Wolfe, C. W. and Vilks, I. (1960): Pseudomorphs after Datolite, Prehnite and Apophyllite from East Granby, Connecticut. Am. Mineral. 45, 443-447.
      • Glastonbury
        • South Glastonbury
[Opal 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.
      • New Britain
[Quartz] Harold Moritz collection
[Quartz] Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
      • Newington
[Quartz] Harold Moritz collection
    • Litchfield Co.
      • Morris
[Quartz] Januzzi, Ronald E. and David Seaman. (1976), Mineral Localities Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.
    • Middlesex Co.
      • East Hampton (Chatham)
        • Airline Railroad
[Quartz] Rowan M. Lytle Collection
      • Haddam
        • Haddam Neck
[Quartz var: Smoky Quartz] Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.; Scovil, Jeffrey A. (1992): Famous Mineral Localities: the Gillette Quarry, Haddam Neck, Connecticut. (Mineralogical Record, 23(1):19-28.); Schooner, Richard. (1958) THE MINERALOGY OF THE PORTLAND-EAST HAMPTON-MIDDLETOWN-HADDAM AREA IN CONNECTICUT (With a few notes on Glastonbury and Marlborough).
[Quartz] Seaman, David (1976): "Pegmatite Minerals of the World" in: 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).; Harold Moritz field observations.
        • Higganum
[Opal var: Opal-AN] Former Don Miller collection
[Opal var: Opal-AN] Former Don Miller collection
[Quartz] Williams (circa 1945 and 1899); Harold Moritz collection
      • Portland
        • Collins Hill
          • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
[Quartz] Schooner, Richard. (1955): 90 Minerals from 1 Connecticut Hill. Rocks & Minerals: 30(7-8): 351-8.; Cameron, Eugene N., Larrabee, David M., McNair, Andrew H., Page, James T., Stewart, Glenn W., and Shainin, Vincent E. (1954): Pegmatite Investigations 1942-45 New England; USGS Professional Paper 255: 333-338.; Schooner, Richard. (1958): The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner; Ralph Lieser of Pappy’s Beryl Shop, East Hampton; and Howard Pate of Fluorescent House, Branford, Connecticut.
    • New Haven Co.
      • Beacon Falls
[Quartz] Specimens collected by Jeremy Zolan in Feb., 2006; Harold Moritz collection
[Quartz var: Smoky Quartz] Harold Moritz collection
      • East Haven
[Quartz] Powell, Richard C. and Wolfgang Vogt. (1987), Cinque Quarry, A Suburban Site in Connecticut Makes Collecting a Cinch. Rock and Gem: (6): 36-39.
[Quartz var: Smoky Quartz] Vener, Herm. (1987): Report on the Road Cut [Mclay Avenue] off Grannis St [Laurel Street] Just Past the Cinque Quarry. Triassic Valley Bulletin.
[Quartz var: Amethyst] Brace, John P. (1823), Miscellaneous Localities of Minerals. American Journal of Science: s.1, 6: 250-1.
[Quartz] Bill Barrett collection
[Quartz] Bill Barrett Coll.; Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis.
    • New London Co.
      • North Stonington
[Quartz] Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 407.
      • Salem
[Quartz] A. Berluti collection; Henderson, William A., Jr, and Michael Haritos. (1989), Amethyst Scepters, Salem, New London County, Connecticut. Rocks & Minerals: 64(6).
    • Tolland Co.
      • Stafford
[Quartz] Zodac, Peter (1948), Diamond Ledge, West Stafford, Conn. Rocks & Minerals: 23: 611.
      • Willington
        • West Willington
[Quartz] Ague, J. J. (1995): Deep Crustal Growth of Quartz, Kyanite and Garnet into Large-Aperature, fluid-filled fractures, northeastern Connecticut, USA. Journal of Metamorphic Geology: 13: 299-314.; Horowitz, Irving L. (2003): The Remarkable Quartz Crystals of West Willington, Tolland County, Connecticut. Rocks & Minerals: 78(4): 257-261.
[Quartz var: Amethyst] Harold Moritz collection
      • Plainfield
        • Moosup
[Quartz var: Amethyst] Harold Moritz collection
[Quartz var: Amethyst] Clark, Bill. (2001). Connecticut Quartz: Interesting Specimens from a former Collecting Site. Rock & Gem: 31(8).
      • Windham
        • Willimantic
[Quartz var: Smoky Quartz] Wells, H. L. (1887), Bismutosphaerite from Willimantic and Portland. American Journal of Science: s. 3, 34: 271-4.
  • Georgia
    • Wilkes Co.
      • Jacksons Crossroads
[Quartz var: Amethyst] Min Rec 36:3 pp 288-289 []
  • Idaho
    • Boise Co.
[Quartz var: Smoky Quartz] Ted Johnson Collection
  • Kentucky
[Quartz] T. Kennedy collection
  • Maine
    • Oxford Co.
      • Albany
[Quartz var: Rose Quartz] Barry Heath and Frank Perham; King, V. (ed.), 2009, Maine feldspar, Families, and Feuds.
[Quartz var: Rose Quartz] King, V. and Foord, E., 1994, Mineralogy of Maine, King, V. Maine Feldspar, Families, and Feuds.; Cameron, Eugene N.; and others (1954) Pegmatite investigations, 1942-45, in New England. USGS Professional Paper 255.
      • Greenwood
[Quartz] Rocks & Min.: 62: 443; King, V. and Foord, E., 1994, Mineralogy of Maine.; Mineral News (1993) 9:2 p. 8
      • Hebron
[Quartz var: Rose Quartz] Stan Perham personal communication, 1963.
      • Newry
[Quartz var: Rose Quartz] King, V. T., 2006, Minerals of Halls Ridge and Plumbago-Puzzle Mountain, Newry, ... Maine, Mineral News, v. 22(6): p. 1-3.
[Quartz var: Rose Quartz] King, V. and Foord, E., 1994, Mineralogy of Maine, v. 1.; Mineralogical Record 22:382
      • Paris
[Quartz] 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. "Maine Mineral Localites, 3rd Ed." by Thompson, W.B., , 1998 Mineralogical Record 22:382
      • Rumford
[Quartz var: Rose Quartz] King, V. and Foord, E., 1994, Mineralogy of Maine, v. 1.
    • Sagadahoc Co.
      • Topsham
[Quartz] Edith Trebilcock
  • Massachusetts
    • Bristol Co.
      • Acushnet
[Quartz] No reference listed
    • Essex Co.
[Jasper] William Prescott (1852) Journal of the Essex County Natural History Society: containing various Communications to the Society pp 78-91
    • Norfolk Co.
      • Bellingham
[Quartz var: Amethyst] Harvard Museum of Natural History, no.119196; Mineralogical Record (1990) 21:203-213
[Quartz] Gleba, 1978. Massachusetts Mineral & Fossil Localities
      • Wrentham
[Quartz var: Amethyst] Michael W. Kieron collection; Mineralogical Record (1990) 21:203-213
    • Worcester Co.
      • Southborough
[Quartz var: Amethyst] []
  • Michigan
    • Houghton Co.
      • Calumet Township
        • Calumet
          • Calumet & Hecla Mine
[Chalcedony var: Agate] Rosemeyer, T. 2011 New from the Keweenaw: Part 4 - Recent Mineral Finds in Michigan's Copper Country. Rocks & Minerals 86:205-227
[Quartz] Mineralogy of Michigan (2004) Heinrich & Robinson
      • Houghton
[Quartz] yalmer primeau
    • Marquette Co.
      • Negaunee
        • Goose Lake
[Quartz] Mineralogy of Michigan (2004) Heinrich & Robinson
  • Montana
    • Custer Co.
[Chalcedony var: Moss Agate] The River Runs North - the Story of Montana Moss Agate by Tom Harmon (author)
    • Jefferson Co.
      • Boulder Batholith
        • Toll Mountain
[Quartz var: Amethyst] Rocks & Minerals 47:3 pp160-164; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
  • New Mexico
    • Lincoln Co.
      • Sacramento Mts
        • White Mountain Wilderness
[Quartz] Min Rec 22:5 pp359-366 The Smoky Bear Quartz Claims Lincoln County New Mexico
  • New York
    • Ulster Co.
      • Wawarsing
        • Ellenville
[Quartz] Dana 7:I:592.; Econ Geol (1990) 85:182-196
        • Spring Glen
[Quartz] Econ Geol (1990) 85:182-196
  • North Carolina
    • Lincoln Co.
      • Iron Station
[Quartz var: Amethyst] Genth,F.A.,1891,The Minerals Of North Carolina;USGS Bulletion No.74
  • Pennsylvania
    • Philadelphia Co.
      • Hestonville
[Quartz] Samuel S. Gordon (1922) Mineralogy of Pennsylvania.; pg. 234
  • Rhode Island
    • Bristol Co.
      • Bristol
[Quartz var: Amethyst] Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, Ed., University of Rhode Island, Kingston
    • Providence Co.
      • Burrillville
        • Harrisville
[Quartz var: Amethyst] Mineralogical Record (1990) 21:203-213
      • Cumberland
[Quartz] []; Rocks & Minerals (1986) 61:264-275
      • Lincoln
        • Lime Rock
[Quartz] Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, Ed., University of Rhode Island, Kingston; Rocks & Min.: 17:51; 20:463-464.; Rocks & Minerals (1986) 61:264-275; Rocks & Minerals (1986): 61: 286-289
    • Washington Co.
      • South Kingstown
[Quartz] Miller, C. E. (1971) Rhode Island Minerals and Their Locations, University of Rhode Island, Kingston
  • South Dakota
    • Custer Co.
      • Custer District
        • Custer
[Quartz var: Rose Quartz] Rocks & Min.: 10:145; 16:360-363; 57:54.
[Quartz var: Rose Quartz] R&M 75:3 pp 156-169
  • Vermont
    • Bennington Co.
[Quartz] Matthew Lambert
  • Washington
    • Chelan Co.
      • Wenatchee District
        • Wenatchee
          • Squillchuck Creek
[Quartz] Huntting, M. (1956): Inventory of Washington Minerals, Part II, Metallic Minerals, Vol. 1, p. 113; Lasmanis, R. Et Al (1990): Metal Mines of Washington-Preliminary Report, p.14; Linda D. Gill, 2008; Collected at 1800 level
    • King Co.
      • Denny Mountain
[Quartz var: Amethyst] UBC specimen
      • Goldmyer Hot Springs
[Quartz] Cannon, B. (1975): Minerals of Washington, p.71
[Quartz var: Amethyst] Bob Jackson, mine owner; Rocks & Minerals (1991) 66:466-476
      • North Bend
[Quartz] Min Record:20(5):390; Minerals of Washington, B. Cannon, 1975; Rocks and Minerals 66:6, p.469
[Quartz] Minerals of Washington, Bart Cannon, 1975; Rocks and Minerals 66:6, p.469
  • Ba Ria-Vung Tau Province
[Quartz] "Mario Lazzerini Denchi' Collection"
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