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Euclase

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About EuclaseHide

Formula:
BeAl(SiO4)(OH)
Colour:
Colorless, white, pale green to deep yellowish green, greenish blue, pale blue to deep blue
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.99 - 3.1
Crystal System:
Monoclinic
Name:
From the greek for easy and fracture, due to good cleavage

Classification of EuclaseHide

Approved, 'Grandfathered' (first described prior to 1959)
9.AE.10

9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
52.2.1.1

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
2 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
16.6.2

16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be

Physical Properties of EuclaseHide

Vitreous
Transparency:
Transparent, Translucent
Comment:
Somewhat pearly on cleavage
Colour:
Colorless, white, pale green to deep yellowish green, greenish blue, pale blue to deep blue
Streak:
White
Hardness:
7½ on Mohs scale
Hardness:
VHN100=1310 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {010}
Imperfect on {110} {001}
Fracture:
Conchoidal
Density:
2.99 - 3.1 g/cm3 (Measured)    3.115 g/cm3 (Calculated)

Optical Data of EuclaseHide

Type:
Biaxial (+)
RI values:
nα = 1.652 nβ = 1.655 nγ = 1.671
2V:
Measured: 50° , Calculated: 48°
Max Birefringence:
δ = 0.019
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Pleochroism:
Visible
Comments:
Shades of deep blue

Chemical Properties of EuclaseHide

Formula:
BeAl(SiO4)(OH)
IMA Formula:
BeAlSiO4(OH)
Common Impurities:
Zn,F,Ca,Mg,Fe,Na

Crystallography of EuclaseHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 4.763(5) Å, b = 14.29(2) Å, c = 4.618(5) Å
β = 100.25°
Ratio:
a:b:c = 0.333 : 1 : 0.323
Unit Cell V:
309.30 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic crystals

Crystallographic forms of EuclaseHide

Crystal Atlas:
Image Loading
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Euclase no.10 - Goldschmidt (1913-1926)
Euclase no.69 - Goldschmidt (1913-1926)
Euclase no.70 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indices | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Geological EnvironmentHide

Geological Setting:
Decomposition of beryl in pegmatites and alpine veins

Type Occurrence of EuclaseHide

Synonyms of EuclaseHide

Other Language Names for EuclaseHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
28 photos of Euclase associated with QuartzSiO2
16 photos of Euclase associated with MuscoviteKAl2(AlSi3O10)(OH)2
7 photos of Euclase associated with FluoriteCaF2
5 photos of Euclase associated with AlbiteNa(AlSi3O8)
5 photos of Euclase associated with RutileTiO2
5 photos of Euclase associated with CalciteCaCO3
3 photos of Euclase associated with Rock CrystalSiO2
3 photos of Euclase associated with CleavelanditeNa(AlSi3O8)
2 photos of Euclase associated with Smoky QuartzSiO2
2 photos of Euclase associated with BerylBe3Al2(Si6O18)

Related Minerals - Nickel-Strunz GroupingHide

9.AE.05BerylliteBe3(SiO4)(OH)2 · H2OOrth.
9.AE.15SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
9.AE.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2Mon.
9.AE.25GerstmanniteMnMgZn(SiO4)(OH)2Orth.
9.AE.30ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
9.AE.35StringhamiteCaCu(SiO4) · H2OMon.
9.AE.40Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20Mon. 2/m : B2/m
9.AE.45YeatmaniteZn6Mn2+9Sb5+2(SiO4)4O12Tric.
9.AE.50SphaerobertranditeBe3(SiO4)(OH)2Mon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide

52.2.1.2ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
52.2.1.3HodgkinsoniteMn2+Zn2(SiO4)(OH)2Mon.
52.2.1.4GerstmanniteMnMgZn(SiO4)(OH)2Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.6.1BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
16.6.3BaveniteCa4Be2Al2Si9O26(OH)2Orth. mm2
16.6.4AminoffiteCa2(Be,Al)(Si2O7)(H2O,OH)Tet.
16.6.5MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
16.6.6LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
16.6.7Surinamite(Mg,Fe)3Al4BeSi3O16Mon.
16.6.8Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8Trig.

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.

References for EuclaseHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schweizerische mineralogische und petrographische Mitteilungen: 72: 159-165.
Zeitschrift für Kristallographie: 117: 16-36.

Internet Links for EuclaseHide

Localities for EuclaseHide

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.
Australia
 
  • Western Australia
    • Coolgardie Shire
      • Spargoville
Sue Koepke collection
    • Mount Magnet Shire
      • Dalgaranga Station
Pegmatites of Western Australia; M Jacobson, M Calderwood, B Grguric; Hesperian Press, Perth, 2007
Austria
 
  • Carinthia
    • Spittal an der Drau District
      • Heiligenblut am Großglockner
        • Große Fleiß valley
G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
  • Salzburg
    • St. Johann im Pongau District
      • Bad Gastein
G. Niedermayr et al.: Carinthia II 194./114.:240-241 (2003)
    • Zell am See District
      • Krimml
Lapis 29(9):32-33 (2004)
      • Rauris
        • Alteck - Hoher Sonnblick area
          • Kolm-Saigurn
Lapis 29(9):28 (2004)
        • Grieswies - Krumlkeeskopf area
Lapis 29(9):28-29 (2004)
Walter, F. (2009)
          • Grieswies
A. Strasser: Die Minerale Salzburgs (1989)
A. Strasser: Die Minerale Salzburgs (1989)
Lapis 29(9):28 (2004)
        • Kruml glacier
A. Schermaier: Der Aufschluss 37(12):417-420 (1986)
  • Tyrol
    • Lienz District
      • Virgen valley
        • Umbal valley
          • Roßhuf
Lapis 29(9):33 (2004)
    • Schwaz District
      • Finkenberg
Martin Slama collection (SXRD-analysed by Uwe Kolitsch)
      • Gerlos
        • Schönach valley
          • Plattenscharte - Mitterkopf area
Lapis 34 (7-8) (2009) p. 9
Lapis 29(9):30 (2004)
      • Mayrhofen
Lapis 29(9):30 (2004)
Lapis 29(9):32 (2004)
Lapis 29(9):30-31 (2004)
R. Dallinger & J. Gufler (2006): Der größte Euklaskristall der Alpen - Neufund im Zillertal. Lapis 31 (3), 28-31. (in German); Lapis 29(9):31 (2004)
Lapis 29(9):31-32 (2004)
Belgium
 
  • Wallonia
    • Luxembourg
      • Vielsalm
A. Hanson, Bull. Minéral. , 1985, 108, pp. 139-143.
Brazil
 
  • Bahia
Luiz Menezes
  • Minas Gerais
Oleg Lopatkin specimen
    • Conselheiro Pena
Richard Dale collection
    • Minas Novas
No reference listed
Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 112).; Cassedanne, J.P. (1989) Famous Mineral Localities: The Ouro Preto [Brazil] Topaz Mines. Mineralogical Record, 20(3), 221-233.
      • Cachoeira do Campo district
Gauzzi, T., Graça, L. M., Lagoeiro, L., de Castro Mendes, I., & Queiroga, G. N. (2018). The fingerprint of imperial topaz from Ouro Preto region (Minas Gerais state, Brazil) based on cathodoluminescence properties and composition. Mineralogical Magazine, 82(4), 943-960.
      • Rodrigo Silva district
        • Boa Vista
Van King
Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 168-370.
    • São Sebastião do Maranhão
Graziani, G. and Guidi, G. (1980) Euclase from Santa do Encoberto, Minas Gerais, Brazil. American Mineralogist, 65, 183-187.; Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 112).
  • Rio Grande do Norte
    • Borborema mineral province
      • Carnaúba dos Dantas
        • Ermo
http://www.minsocam.org/MSA/AmMin/TOC/Articles_Free/2002/Eeckhout_p1297-1306_02.pdf
      • Equador
[www.johnbetts-fineminerals.com] Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 112).
Palinkaš, S. S., Wegner, R., Čobić, A., Palinkaš, L. A., De Brito Barreto, S., Váczi, T., & Bermanec, V. (2014). The role of magmatic and hydrothermal processes in the evolution of Be-bearing pegmatites: Evidence from beryl and its breakdown products. American Mineralogist, 99(2-3), 424-432.
Specimens sold by Richard Gaines in 1972-Rock Currier
De Ascenção Guedes, R., Lebocey, J., Bayle, L.-D. & Chappero, P.-J. (2011): Munich 2011. Le Règne Minerál. 102, 10-29 [p. 20]
Palinkaš, S. S., Wegner, R., Čobić, A., Palinkaš, L. A., De Brito Barreto, S., Váczi, T., & Bermanec, V. (2014). The role of magmatic and hydrothermal processes in the evolution of Be-bearing pegmatites: Evidence from beryl and its breakdown products. American Mineralogist, 99(2-3), 424-432.
      • Parelhas
In Coll. Martin Slama
Fernando Brederodes Collection
Canada
 
  • British Columbia
    • Golden Mining Division
      • Radium Hot Springs
Ray Hill.
    • Revelstoke Mining Division
      • Revelstoke
DIXON,A., CEMPIREK, J. & GROAT, L.A. (2014) Mineralogy and geochemistry of pegmatites on Mount Begbie, British Columbia. Canadian Mineralogist 52, 129-164.; Dixon, A. (2014, October). Mount Begbie Pegmatite Group, British Columbia, Canada–evolution from Barren to Complex Rare-element Pegmatites. In 2014 GSA Annual Meeting in Vancouver, British Columbia.
China
 
  • Fujian
    • Nanping
      • Yanping District
        • Nanping pegmatite field (Xikeng pegmatite field)
Can Rao, Ru Cheng Wang, and Huan Hu (2011): Paragenetic assemblages of beryllium silicates and phosphates from the Nanping No. 31 granitic pegmatite dyke, Fujian province, southestern China. Canadian Mineralogist. 49, 1175-1187; Rao, C., Wang, R. C., Hatert, F., & Baijot, M. (2014). Hydrothermal transformations of triphylite from the Nanping No. 31 pegmatite dyke, southeastern China. European Journal of Mineralogy, 26(1), 179-188.; Rao, C., Wang, R., Yang, Y., Hatert, F., Xia, Q., Yue, X., & Wang, W. (2017). Insights into post-magmatic metasomatism and Li circulation in granitic systems from phosphate minerals of the Nanping No. 31 pegmatite (SE China). Ore Geology Reviews, 91, 864-876.
  • Hunan
    • Chenzhou
      • Linwu Co.
        • Xianghualing Sn-polymetallic ore field
Huang et al. (1988): Hsianghualing rocks, mineral deposits and minerals. Beijing Sci. Techn. Publ. Bur. (Beijing), 255 pp.
      • Yizhang Co.
        • Yaogangxian W-Sn ore field
Ottens, B. (2011): Mineralogical Record 42, 557-603
  • Inner Mongolia
    • Chifeng City (Ulanhad League; Chifeng Prefecture)
      • Hexigten Banner (Keshiketeng Co.)
Ottens, B. and G. Neumeier (2012) The Huanggang Mine, Inner Mongolia, China. Mineralogical Record 43:529-563
  • Jiangxi
    • Ganzhou
      • Chongyi Co.
Ottens, B. (2009): Lapis 34(10), 31-41
      • Dayu Co.
        • Xihuashan ore field
Dr. Lueg collection; B. Ottens collection + Ottens, B. (2007): Chinesisches Tagebuch (IV): Wulfenite aus Xinjiang, Euklas us den Dayu-Bergen und neue Fluorite. LAPIS 32 (5), 34-39 (in German)
Colombia
 
  • Boyacá Department
    • Chivor Municipality
Emeralds of the World English extraLapis Vol. 2 2002 pp36-45
    • Pauna Municipality
Fabre Minerals.
  • Cundinamarca Department
    • Guavió-Guatéque mining district
Emeralds of the World English extraLapis Vol. 2 2002 pp36-45
Czech Republic
 
  • Karlovy Vary Region
    • Cheb District
      • Lázně Kynžvart
Černý, P., Veselovský, F.: Pegmatit Bílý kámen (Weisser Stein) u Kynžvartu. Minerál, 2000, roč. 8, č. 1, s. 10-16.
  • Olomouc Region
    • Šumperk District
      • Maršíkov (Marchendorf)
Toegel, V.: Mineralizace Be pegmatitu „Pod kořeny“ v Maršíkově. Minerál, 2011, roč. 19, č. 3, s. 207-213.
Novák, M.: Maršíkov - Scheibengraben. In Exkurzní průvodce po mineralogických lokalitách na Sobotínsku. Univerzita Palackého v Olomouci, 2002, Olomouc, s. 38-41. ; Novák, M., ČERNÝ, P., & Uher, P. (2003). Extreme variation and apparent reversal of Nb-Ta fractionation in columbite-group minerals from the Scheibengraben beryl-columbite granitic pegmatite, Marsikov, Czech Republic. European Journal of Mineralogy, 15(3), 565-574.
Finland
 
  • Southwest Finland
    • Kimitoön (Kemiönsaari)
Ilkka Mikkola collection
Germany
 
  • Bavaria
    • Upper Franconia
      • Hof
        • Sparneck
          • Reinersreuth
            • Großer Waldstein
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Wunsiedel im Fichtelgebirge
Lapis, 10 (7/8), 15-26+81
        • Tröstau
Lapis,10 (7/8), 40-48.
        • Weißenstadt
          • Großer Waldstein
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
          • Kirchenlamitz
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
          • Rudolfstein
Wittern: "Mineralfundorte in Deutschland", 2001
  • Saxony
    • Vogtlandkreis
      • Bad Brambach
Lapis 2002(11), 13-18
Italy
 
  • Trentino-Alto Adige
    • South Tirol
      • Cadipietra (Steinhaus)
        • Keilbachspitz
Lapis 29(9):32-33 (2004)
Lapis 29(9):33 (2004)
Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
      • Vizze Valley (Pfitsch valley)
Gartner, Ar., Gartner An. (2002): Burgum im schönen Pfitschtal. Tipografia Novaprint Cavalese, 126 pp.
Japan
 
  • Gifu Prefecture
    • Nakatsugawa City
      • Shimono
Takashi ISHIBASHI et al., "Euclase from Fukuoka mine, Nakatsugawa City, Gifu Prefecture, Japan", 2011 Joint Annual Meeting of Japan Association of Mineralogical Sciences and The Geological Society of Japan
Madagascar
 
  • Alaotra-Mangoro
Arliguie M photo & specimen
  • Itasy
    • Soavinandriana
Moore, T. (2002) What's New in Minerals?. Tucson Show 2002. Mineralogical Record. 33: p. 273
  • Vakinankaratra
    • Betafo
      • Anosiarivo Manapa
        • Manapa pegmatite Field
In Collection of Martin Slama, obtained from Jochen Hintze
Mozambique
 
  • Nampula Province
Martin Slama
  • Zambezia Province
    • Alto Ligonha District
      • Mocuba District
        • Mocuba
Moiana, M. (2010) Certeza geológica da ocorrência e viabilidade económica para o aproveitamento dos Berilos" True Blue" de Licungo, Zambézia, Moçambique (Doctoral dissertation Universidade do Minho).
v. Knorring, O., Sahama, Th.G. & Saari, E. 1964. A note on euclase from Muiane Mine, Alto Ligonha, Mozambique. Bulletin de la Commission géologique de Finlande 215, 143–145.
Dias, M. Bettencourt and Wilson, W. E., 2000, Mineralogical Record, 31:459-497.
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Mogok Valley
Themelis, Ted, 2008, Gems and Mines of Mogok.
Namibia
 
  • Erongo Region
    • Karibib
      • Spitzkopje Area
Cairncross, B. (2005) Famous Mineral Localities: Klein Spitzkoppe, Namibia. Mineralogical Record 36(4) 317-335
- Bezing, L. von, Bode, R. & Jahn, S. (2007): Namibia. Mineralien und Fundstellen. Edition Schloss Freudenstein, Bode Verlag, Haltern, p. 288-290 (in German)
Norway
 
  • Aust-Agder
    • Iveland
      • Eptevatnet
Strand, T.(1953): Euclase from Iveland, occurring as an alteration product of beryl. Norsk Geologisk Tidsskrift 31,1-5
Peru
 
  • Áncash
    • Pallasca Province
      • Pampas District
Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.; Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.
Portugal
 
  • Viseu
    • Mangualde
      • Chãs de Tavares
Pedro Alves collection
Russia
 
  • Krasnoyarsk Krai
    • Kuragin District
Pavel M. Kartashov data
  • Primorsky Krai
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.
Ryazantseva, M. D. (2001) Southwest Primorye (the Voznesenka Ore District). pp125-136 in Khanchuk, A.I., Gonevchuk, G.A. & Seltmann, R. (Eds) Metallogeny of the Pacific Northwest (Russian Far East): Tectonics, Magmatism and Metallogeny of Active Continental Margins. IAGOD Guidebook series 11, Dalnauka Publishing House, Vladivostok 2004, 176 p
[World of Stones 12:49]
  • Sverdlovsk Oblast
    • Malyshevo
      • Izumrudnye Kopi area
        • Malyshevskoe deposit (Mariinskoe deposit)
Avdonin V.N., Polenov Yu.A. (2004) Essays on Uralian minerals, - UGGA press, p. 419 (in Rus.).
    • Prigorodny District
      • Yuzhakovo
Sokol, E. V., Seryotkin, Y. V., & Bul’bak, T. A. (2010). Na-Li-Be-rich cordierite from the Murzinka pegmatite field, Middle Urals, Russia. European Journal of Mineralogy, 22(4), 565-575.
Sokol, E. V., Seryotkin, Y. V., & Bul’bak, T. A. (2010). Na-Li-Be-rich cordierite from the Murzinka pegmatite field, Middle Urals, Russia. European Journal of Mineralogy, 22(4), 565-575.
  • Zabaykalsky Krai
    • Buriatia Republic (Buryatia)
Pavel M. Kartashov data
Spain
 
  • Catalonia
    • Girona (Gerona)
      • Alt Empordà
        • Cadaqués
Pura Alfonso - J. C. Melgarejo, Boron vs. Phosphorus in granitic pegmatites: the Cap de Creus case, Journal of the Czech Geological Society, 45/1-2 (2000)
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
Sweden
 
  • Stockholm County
    • Nynäshamn
Gustafsson, Lars & Otter, Bertil (1991): Mineralförekomster i Stockholmstrakten.Del 2. STEIN 18(4),4-12
Gustavsson (Sic!), Lars: (1992): En beryllium paragenes från Stora Vika. Berg & Mineral. 2, nr 3, p.11
  • Västernorrland County
    • Kramfors
Jonsson, E. & Langhof, J. (1997): Late-stage beryllium silicates from the Sels-Vitberget granitic pegmatite, Kramfors, Central Sweden. GFF 119:249 - 251
  • Västmanland County
    • Köping
Nysten,P. & Gustafsson, L.(2006): I jakt på sällsynta mineral. Geologiskt forum nr 49, 22-25; Martensson, C. (1960) Euklas und Bertrandit aus dem Feldspatpegmatit von Kolsva in Schweden. Neues Jahrbuch fiir Mineralogie Abhandlungen, 94, 1248-1252.
Switzerland
 
  • Ticino
    • Leventina
      • Central St Gotthard Massif
        • Prevat Valley
Lapis 29(9):33-34 (2004)
    • Vallemaggia
      • Bavona Valley
        • Cavagnoli glacier area (Cavagnöö glacier)
Lapis 29(9):34 (2004)
Tanzania
 
  • Morogoro Region
    • Morogoro Rural District
Natural History Museum London collection
UK
 
  • England
    • Cornwall
      • Perranzabuloe
        • Perranporth
Kingsbury, A.W.G. (1958) Two beryllium minerals new to Britain: euclase and herderite. Mineralogical Magazine, vol. 31, n° 240, 815-817.; Golley, P., and Williams, R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications (Truro), 104 pp.
    • Devon
      • West Devon
        • Okehampton Hamlets
Ukraine
 
  • Zhytomyr Oblast
Lyckberg, P., Chornousenko, V. & Wilson, W. E. (2009): Volodarsk-Volynski, Zhitomir Oblast, Ukraine. Mineralogical Record, 40, 473-506.
USA
 
  • Alaska
    • Nome Census Area
      • Port Clarence Mining District
U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
        • Seward Peninsula
Sinkankas, 1989. Emerald & Other Beryls.
  • Colorado
    • Chaffee Co.
Van King specimen
    • Park Co.
      • Lake George
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
      • Lake George Beryllium area (Badger Flats Beryllium area; Mountain Dale)
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.
Minerals of Colorado (1997) Eckel, E. B.
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.
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Minerals of Colorado (1997) Eckel, E. B.
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.
  • Connecticut
    • Fairfield County
      • Trumbull
        • Long Hill
Shepard, Charles U. (1842): On Washingtonite (a New Mineral), the Discovery of Euclase in Connecticut, and Additional Notices of the Supposed Phenakite of Goshen, and Calstron-baryte of Schoharie, N. Y. American Journal of Science: 43: 364.; Dana, James D. (1851): Mineralogical Notices: Diaspore. American Journal of Science: s. 2: 12: 215.; Shepard, Charles U. (1851): Title unknown. Proceedings of the 4th Meeting, American Association for the Advancement of Science: 319.
    • Middlesex Co.
      • Portland
        • Collins Hill
          • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
Harold Moritz collection
  • Maine
    • Oxford County
      • Albany
King, V., 2009, Maine Feldspar, Families, and Feuds.
    • Sagadahoc Co.
Don Swenson collection
  • Michigan
www.deq.state.mi.us/documents/deq-glm-rcim-geology-Minerals_Found_In_Michigan.Pdf.
  • New Hampshire
    • Rockingham Co.
      • Raymond
Francis, C. A. (1985): Minerals of the Chandler Mine, A Zoned Lithium Rich Pegmatite (Rocks and Minerals, 60:263-264) ; Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index
  • New Mexico
    • Sandoval Co.
Minerals of New Mexico 3rd ed.
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
  • North Carolina
    • Polk Co.
Genth,F.A and Kerr,W.C,1881,Minerals and Mineral Localities of North Carolina; Kunz, G., 1885, Precious Stones, USBM, p. 741
  • Texas
    • Hudspeth Co.
      • Quitman Mountains
R&M 66:3 pp 196-224
  • Virginia
    • Amelia Co.
      • Winterham
Rocks & Min.: 8:143-144.
  • Wisconsin
    • Marathon Co.
Cordura, W http://www.uwex.edu/wgnhs/Mineral%20Index/Minerals/euclase.htm
Uzbekistan
 
  • Tashkent
    • Chatkal-Kuraminskii Range
in Coll. M. Slama
Zimbabwe
 
  • Mashonaland West
    • Karoi District (Urungwe; Hurungwe District)
Journal of Gemmology 1998, Volume 26 No. 4, 209-218; Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa; Bartholomew, D. S. (1990). Base metal and industrial mineral deposits of Zimbabwe. Zimbabwe Geological Survey, Mineral Resources Survey No. 22
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa: 98.
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa: 98.
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa
 
Mineral and/or Locality  
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