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Euclase

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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
Hide all sections | Show all sections

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
Click on an icon to view
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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Transparency
Opaque | Translucent | Transparent

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X-Ray Powder DiffractionHide

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

Type Occurrence of EuclaseHide

Synonyms of EuclaseHide

Other Language Names for EuclaseHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz28 photos of Euclase associated with Quartz on mindat.org.
Muscovite16 photos of Euclase associated with Muscovite on mindat.org.
Fluorite7 photos of Euclase associated with Fluorite on mindat.org.
Albite5 photos of Euclase associated with Albite on mindat.org.
Rutile5 photos of Euclase associated with Rutile on mindat.org.
Calcite5 photos of Euclase associated with Calcite on mindat.org.
Rock Crystal3 photos of Euclase associated with Rock Crystal on mindat.org.
Cleavelandite3 photos of Euclase associated with Cleavelandite on mindat.org.
Smoky Quartz2 photos of Euclase associated with Smoky Quartz on mindat.org.
Beryl2 photos of Euclase associated with Beryl on mindat.org.

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
    • Hohe Tauern
      • Goldberg group
        • Große Fleiß valley
G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
  • Salzburg
    • Hohe Tauern
      • Gastein valley
        • Anlauf valley
G. Niedermayr et al.: Carinthia II 194./114.:240-241 (2003)
      • Krimmler Ache valley
Lapis 29(9):32-33 (2004)
      • Rauris valley
        • Hüttwinkl valley
          • 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)
          • Krumlbach valley
            • Kruml glacier
A. Schermaier: Der Aufschluss 37(12):417-420 (1986)
  • Tyrol
    • East Tyrol
      • Virgen valley
        • Umbal valley
          • Roßhuf
Lapis 29(9):33 (2004)
    • North Tyrol
      • Zillertal
        • Gerlos valley
          • Schönach valley
            • Plattenscharte - Mitterkopf area
Lapis 34 (7-8) (2009) p. 9
Lapis 29(9):30 (2004)
        • Stillupgrund (Stillup valley)
Lapis 29(9):30 (2004)
        • Zemmgrund
          • Alpenrose Inn
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):30-31 (2004)
          • Mörchner area
Lapis 29(9):32 (2004)
Lapis 29(9):31-32 (2004)
Martin Slama collection (SXRD-analysed by Uwe Kolitsch)
Belgium
 
  • Luxembourg Province
    • Stavelot Massif
      • Vielsalm
A. Hanson, Bull. Minéral. , 1985, 108, pp. 139-143.
Brazil
 
  • Bahia
Luiz Menezes
  • Minas Gerais
Oleg Lopatkin specimen
Richard Dale collection
    • Iron Quadrangle
[MinRec 20:230]
        • Rodrigo Silva district
          • Boa Vista
Van King
Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 168-370.
    • Minas Novas
No reference listed
    • São Sebastião do Maranhão
AmMin 65:183-187 (1980)
  • 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]
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]
      • 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 Province
    • Nanping Prefecture
      • 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.
  • Hunan Province
    • Chenzhou Prefecture
      • 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 Autonomous Region
    • 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 Province
    • Ganzhou Prefecture
      • 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
    • Guavió-Guatéque Mining District
      • Mun. de Chivor
Emeralds of the World English extraLapis Vol. 2 2002 pp36-45
    • Mun. de Pauna
Fabre Minerals.
  • Cundinamarca Department
    • Guavió-Guatéque Mining District
Emeralds of the World English extraLapis Vol. 2 2002 pp36-45
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Lázně Kynžvart (Bad Königswart)
Černý, P., Veselovský, F.: Pegmatit Bílý kámen (Weisser Stein) u Kynžvartu. Minerál, 2000, roč. 8, č. 1, s. 10-16.
  • Moravia (Mähren; Maehren)
    • Olomouc Region
      • Šumperk (Mährisch Schönberg)
        • 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.
Finland
 
  • Southwestern Finland Region
    • Kemiö Island (Kimito Island)
Ilkka Mikkola collection
Germany
 
  • Bavaria
    • Franconia
      • Fichtelgebirge
        • Sparneck
          • Reinersreuth
            • Großer Waldstein
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • Tröstau
          • Leupoldsdorf
Lapis, 10 (7/8), 15-26+81
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
    • Vogtland
      • Bad Brambach
Lapis 2002(11), 13-18
Italy
 
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Bolzano Province (South Tyrol)
      • Aurina Valley (Ahrnbach Valley)
        • Cadipietra (Steinhaus)
          • Keilbachspitz
Lapis 29(9):32-33 (2004)
Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
        • Vento Valley (Wind Valley)
Lapis 29(9):33 (2004)
      • Vizze Valley (Pfitsch valley)
Gartner, Ar., Gartner An. (2002): Burgum im schönen Pfitschtal. Tipografia Novaprint Cavalese, 126 pp.
Japan
 
  • Honshu Island
    • Chubu Region
      • 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
 
  • Antananarivo Province
    • Itasy Region
      • Soavinandriana District
Moore, T. (2002) What's New in Minerals?. Tucson Show 2002. Mineralogical Record. 33: p. 273
  • Toamasina Province (Tamatave)
    • Alaotra-Mangoro Region
Arliguie M photo & specimen
Mozambique
 
  • Nampula Province
Martin Slama
  • Zambezia Province
    • Alto Ligonha District
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 (Mandalay Division)
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Mogok Valley
Themelis, Ted, 2008, Gems and Mines of Mogok.
Namibia
 
  • Erongo Region
    • Karibib District
      • 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
      • Eptevann
Strand, T.(1953): Euclase from Iveland, occurring as an alteration product of beryl. Norsk Geologisk Tidsskrift 31,1-5
Peru
 
  • Ancash Department
    • Pallasca Province
      • Pampas District
Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.; Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.
Portugal
 
  • Viseu District
    • Mangualde
      • Chãs de Tavares
Pedro Alves collection
Russia
 
  • Eastern-Siberian Region
    • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
      • Sayan Mts
        • Kuragin District
Pavel M. Kartashov data
    • Sakha Republic (Saha Republic; Yakutia)
[World of Stones 12:49]
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
Pavel M. Kartashov data
  • Far-Eastern Region
    • Primorskiy Kray
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.
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Ekaterinburg (Sverdlovsk)
          • Malyshevo
            • Izumrudnye Kopi area
              • Malyshevskoe deposit (Mariinskoe)
Avdonin V.N., Polenov Yu.A. (2004) Essays on Uralian minerals, - UGGA press, p. 419 (in Rus.).
        • Yuzhakovo Village
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.
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
 
  • Ångermanland
    • Kramfors
Jonsson, E. & Langhof, J. (1997): Late-stage beryllium silicates from the Sels-Vitberget granitic pegmatite, Kramfors, Central Sweden. GFF 119:249 - 251
  • Södermanland
    • 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
  • Västmanland
    • 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 (Tessin)
    • Leventina
      • Central St Gotthard Massif
        • Prevat Valley
Lapis 29(9):33-34 (2004)
    • Maggia Valley
      • Bavona Valley
        • Cavagnoli glacier area (Cavagnöö glacier)
Lapis 29(9):34 (2004)
Tanzania
 
  • Dar es Salaam Region
    • Morogoro Rural District
Fine euclase specimen in the British Museum-Rock Currier
UK
 
  • England
    • Cornwall
      • St Agnes District
        • 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
      • Okehampton area (Northern Dartmoor)
Ukraine
 
  • Zhytomyr Oblast' (Zhitomir Oblast')
Lyckberg, P., Chornousenko, V. & Wilson, W. E. (2009): Volodarsk-Volynski, Zhitomir Oblast, Ukraine. Mineralogical Record, 40, 473-506.
USA
 
  • Alaska
    • Nome Borough
      • Port Clarence 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 (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) Eckels, 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 Co.
      • 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.
  • Maine
    • Oxford Co.
      • 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 Mts
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
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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