Euclase

Euclase

Floitenturm northeast slope, Mayrhofen, Schwaz District, Tyrol, Austria

Euclase

Gachalá, Cundinamarca Department, Colombia

Euclase

Reinersreuth quarry, Reinersreuth, Sparneck, Hof District, Upper Franconia, Bavaria, Germany

Euclase

Floitenturm northeast slope, Mayrhofen, Schwaz District, Tyrol, Austria

Euclase

Gachalá, Cundinamarca Department, Colombia

Euclase

Reinersreuth quarry, Reinersreuth, Sparneck, Hof District, Upper Franconia, Bavaria, Germany

Euclase

Floitenturm northeast slope, Mayrhofen, Schwaz District, Tyrol, Austria

Euclase

Gachalá, Cundinamarca Department, Colombia

About EuclaseHide

Formula:

BeAl(SiO₄)(OH)

Colour:

Colorless, white, pale green to deep yellowish green, greenish blue, pale blue to deep blue, pink

Lustre:

Vitreous

Hardness:

7½

Specific Gravity:

2.99 - 3.1

Crystal System:

Monoclinic

Name:

Named by René Just Haüy deriving from the Greek εὖ, for 'easily', and κλάσις, for 'fracture', describing the mineral's perfect cleavage.

Type Locality:

ⓘ Ouro Preto, Minas Gerais, Brazil

Visit gemdat.org for gemological information about Euclase.

Unique IdentifiersHide

IMA Classification of EuclaseHide

Classification of EuclaseHide

Mineral SymbolsHide

Physical Properties of EuclaseHide

Optical Data of EuclaseHide

Type:

Biaxial (+)

RI values:

n_α = 1.652 n_β = 1.655 n_γ = 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

Optical Extinction:

Z ∧ c = 41°.

Pleochroism:

Visible

Comments:

Shades of deep blue

Chemistry of EuclaseHide

Crystallography of EuclaseHide

Crystallographic forms of EuclaseHide

Crystal Atlas:

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Euclase no.10 - Goldschmidt (1913-1926)

Euclase no.69 - Goldschmidt (1913-1926)

Euclase no.70 - Goldschmidt (1913-1926)

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0001036	Euclase	Hazen R M, Au A Y, Finger L W (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) American Mineralogist 71 977-984		1986		0	293
0001037	Euclase	Hazen R M, Au A Y, Finger L W (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) American Mineralogist 71 977-984		1986		0	293
0001038	Euclase	Hazen R M, Au A Y, Finger L W (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) American Mineralogist 71 977-984		1986		0	293
0001039	Euclase	Hazen R M, Au A Y, Finger L W (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) American Mineralogist 71 977-984		1986		0	293
0017971	Euclase	Biscoe J, Warren B (1933) The structure of Euclase H Be Al Si O5 _cod_database_code 1011072 Zeitschrift fur Kristallographie 86 292-297		1933		0	293
0010591	Euclase	Mrose M E, Appleman D E (1962) The crystal structures and crystal chemistry of vayrynenite, (Mn,Fe)Be(PO4)(OH), and euclase, AlBe(SiO4)(OH) Zeitschrift fur Kristallographie 117 16-36		1962	Villa Rica, Minas Gerais, Brazil	0	293

CIF Raw Data - click here to closedata_global _chemical_name_mineral 'Euclase' loop_ _publ_author_name 'Hazen R M' 'Au A Y' 'Finger L W' _journal_name_full 'American Mineralogist' _journal_volume 71 _journal_year 1986 _journal_page_first 977 _journal_page_last 984 _publ_section_title ; High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) Sample: Pressure = .001 kbar ; _database_code_amcsd 0001036 _chemical_formula_sum 'Si Al Be O5 H' _cell_length_a 4.780 _cell_length_b 14.322 _cell_length_c 4.6335 _cell_angle_alpha 90 _cell_angle_beta 100.310 _cell_angle_gamma 90 _cell_volume 312.084 _exptl_crystal_density_diffrn 3.088 _symmetry_space_group_name_H-M 'P 1 21/a 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,z' '1/2-x,1/2+y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Si 0.17752 0.10027 0.53639 0.00494 Al 0.24877 0.44470 0.95708 0.00570 Be 0.17410 0.30060 0.45710 0.00760 O1 0.38180 0.03240 0.76300 0.00659 O2 0.38000 0.37700 0.65210 0.00633 O3 0.34310 0.19980 0.52480 0.00671 O4 0.10060 0.05310 0.21130 0.00633 O5 0.15960 0.33200 0.12060 0.00899 H 0.06300 0.30200 0.01100 0.03040

X-Ray Powder DiffractionHide

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Radiation - Copper Kα

Data Set: Minas Gerais, Brazil 656 Minas Gerais, Brazil 1995

Data courtesy of RRUFF project at University of Arizona, used with permission.

Powder Diffraction Data:

d-spacing	Intensity
7.146 Å	(100)
3.219 Å	(50)
3.836 Å	(35)
2.773 Å	(35)
2.444 Å	(35)
2.543 Å	(25)
1.991 Å	(18)

Comments:

Villa Rica, Brazil. Data from Mrose and Von Knorring (1959).

Geological EnvironmentHide

Type Occurrence of EuclaseHide

Synonyms of EuclaseHide

Other Language Names for EuclaseHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for EuclaseHide

References for EuclaseHide

Reference List:

Year ⬇Author Title Publisher

Haüy, R.J. (1792) De l´euclase. Observations sur la Physique, sur l’Histoire Naturelle et sur les Arts: 41: 155-156.

Haüy, R.J. (1792) De l´euclase. Observations sur la Physique, sur l’Histoire Naturelle et sur les Arts: 41: 155-156.

Shepard, C.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, NY. American Journal of Science and Arts: 43(2): 364.

Mallet, J.W. (1853) Analysis of euclase. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: 5(30): 127-127.

Dana, J.D. (1853) On the Isomorphism of Sphene and Euclase. American Journal of Science and Arts: 16(46): 96.

Guyot, M. (1882) Description of a Crystal of Euclase belonging to my Collection. Mineralogical Magazine: 5(23): 107-108.

Des Cloizeaux, A. (1882) Note sur quelques formes nouvelles de l'euclase du Brésil. Bulletin de Minéralogie: 5(9): 317-320.

Spencer, L.J. (1924) Euclase and platinum from diamond-washings in British Guiana. Mineralogical Magazine: 20(104): 186-192.

Biscoe, J., Warren, B.E. (1933) The structure of euclase HBeAlSiO5. Zeitschrift für Kristallographie: 86: 292-297.

Spencer, L.J. (1934) Beryllium minerals (euclase and phenakite) from Africa. Mineralogical Magazine: 23(146): 616-623.

Strand, T. (1953) Euclase from Iveland, occurring as an alteration product of beryl. Norsk Geol Tidssk: 31: 1-5.

Mrose, M.E., Von Knorring, O. (1959) The mineralogy of väyrynenite, (Mn,Fe)Be(PO4)(OH). Zeitschrift für Kristallographie, 112, 275-288. (inc PXRD for euclase)

Sharp, W.N. (1961) Euclase in greisen pipes and associated deposits, Park County, Colorado. American Mineralogist: 46(11-12): 1505-1508.

Bakakin, V.V., Al'tshuller, V.M. (1961) The crystal structure of euclase. Journal of Structural Chemistry: 2(1): 59-60.

Mrose, M.E., Appleman, D.E. (1962) The crystal structures and crystal chemistry of väyrynenite, (Mn,Fe)Be(PO4)(OH), and euclase, AlBe(SiO4)·(OH). Zeitschrift für Kristallographie: 117: 16-36.

Knorring, O., Sahama, T.G., Saari, E. (1964) A note on euclase from Muiane mine, Alto Ligonha, Mozambique. Bulletin de la Commission géologique de Finlande: 36(215): 143-145.

Egorov, I. (1967) Euclase from quartz chlooritic zones of modified granites of Yakutia. Doklady Akademii Nauk SSSR: 172(2): 433.

Bastos, E.M. (1969) Euclase from Minas Gerais, Brazil. Journal of Gemmology: 312-314.

Kosnar, R.A. (1971) Euclase. Rocks & Minerals: 46(7-8): 470-470.

Graziani, G., Guidi, G. (1980) Euclase from Santa do Encoberto, Minas Gerais, Brazil. American Mineralogist: 65(1-2): 183-187.

Hanson, A. (1985) Découverte d'euclase dans un filon de quartz à Ottré, massif de Stavelot, Belgique. Bulletin de Minéralogie: 108(2): 139-143.

Hazen, R.M., Au, A.Y., Finger, L.W. (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH). American Mineralogist: 71(7-8): 977-984.

Hemingway, B.S., Barton, M.D., Robie, R.A., Haselton, H.T. (1986) Heat capacities and thermodynamic functions for beryl, Be3Al2Si6O18, phenakite, Be2SiO4, euclase, BeAlSiO4 (OH), bertrandite, Be4Si2O7 (OH) 2, and chrysoberyl, BeAl2O4. American Mineralogist: 71(3-4): 557-568.

Hofmeister, A.M., Hoering, T.C., Virgo, D. (1987) Vibrational spectroscopy of of beryllium aluminosilicates: heat capacity calculations from band assignments. Physics and Chemistry of Minerals: 14: 205-224.

Demartin, F., Gramaccioli, C.M., Pilati, T. (1992) A first occurrence of euclase in the Swiss Alps: Discovery and refinement of the crystal structure. Schweizerische Mineralogische und Petrographische Mitteilungen: 72: 159-165.

Duroc-Danner, J.M. (1996) Euclase from Colombia showing three-phase inclusions. Journal of Gemmology - London: 25: 175-176.

Stocklmayer, S. (1998) Blue euclase from Zimbabwe-a review. Journal of Gemmology - London: 26: 209-218.

Notari, F., Boillat, P.Y., Grobon, C. (2000) L'euclase bleu-verte de Colombie. Revue de gemmologie AFG: 140: 18-20.

Shannon, Robert D., Shannon, Ruth C., Medenbach, Olaf, Fischer, Reinhard X. (2002) Refractive Index and Dispersion of Fluorides and Oxides. Journal of Physical and Chemical Reference Data, 31 (4) 931-970 doi:10.1063/1.1497384

Guedes, K.J., Krambrock, K., Pinheiro, M.V.B., Menezes Filho, L.A.D. (2006) Natural iron-containing blue and colorless euclase studied by electron paramagnetic resonance. Physics and chemistry of minerals: 33(8): 553-557.

Krambrock, K., Guedes, K.J., Pinheiro, M.V.B. (2008) Chromium and vanadium impurities in natural green euclase and their relation to the color. Physics and Chemistry of Minerals: 35(7): 409-415.

Dias, L.N., Pinheiro, M.V., Krambrock, K. (2009) Radiation-induced defects in euclase: formation of O− hole and Ti 3+ electron centers. Physics and Chemistry of Minerals: 36(9): 519-525.

Tang, J., Liu, X., Xiong, Z., He, Q., Shieh, R. S., Wang, H. (2014) High temperature X-ray diffraction, DSC-TGA, polarized FTIR and high pressure Raman spectroscopy studies on euclase. Bulletin of Mineralogy, Petrology and Geochemistry: 33(3): 289-298.

Francis, C.A., Cook, R.B. (2016) Connoisseur's Choice: Euclase, La Marina Mine, Municipio de Pauna, Boyacá, Colombia. Rocks & Minerals: 91(6): 542-547.

Stocklmayer, S.M. (2017) A new occurrence of euclase in Western Australia. Australian Journal of Mineralogy: 18(2): 39.

Gilles-Guéry, L. (2020) Étude spectroscopique de la couleur des minéraux-gemmes: euclase et béryl. Doctoral dissertation, Sorbonne Université, France.

Gilles-Guéry, L., Galoisy, L., Schnellrath, J., Baptiste, B., Calas, G. (2022) Mn3+ and the pink color of gem-quality euclase from northeast Brazil. American Mineralogist: 107(3): 489-494.

Localities for EuclaseHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Australia
Western Australia Coolgardie Shire Spargoville ⓘ Giles Columbite-Beryl Pegmatite (Giles Prospect)	Sue Koepke collection. Stocklmayer, S.M. (2017) A new occurrence of euclase in Western Australia. Australian Journal of Mineralogy: 18(2): 39.
Yalgoo Shire Dalgaranga Station ⓘ Dalgaranga Mine	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 ⓘ Krumlkeeskopf south slope	Niedermayr, G., Praetzel, I. (1995) Mineralien Kärntens. Naturwiss. Verein für Kärnten.
Salzburg St. Johann im Pongau District Bad Gastein ⓘ Ankogel west slope	G. Niedermayr et al.: Carinthia II 194./114.:240-241 (2003)
Zell am See District Krimml ⓘ Grasleitenscharte	Lapis 29(9):32-33 (2004)
Rauris Alteck - Hoher Sonnblick area Kolm-Saigurn ⓘ Neubauhaus	Lapis 29(9):28 (2004)
Grieswies - Krumlkeeskopf area ⓘ Grieswies-Schafkar	Lapis 29(9):28-29 (2004)
ⓘ Grieswies-Schwarzkogel	Walter, F. (2009)
Grieswies ⓘ Gamskarlgraben	Bogusch, B. (1988) Euklas aus dem Rauriser Tal. Lapis 13(4): 37 Strasser, Albert (1989) Die Minerale Salzburgs. Albert Strasser, Salzburg.
ⓘ Grieswies-Mähder	Strasser, Albert (1989) Die Minerale Salzburgs. Albert Strasser, Salzburg.
ⓘ Todora cleft	Lapis 29(9):28 (2004)
Kruml glacier ⓘ Leistriedel	A. Schermaier: Der Aufschluss 37(12):417-420 (1986)
Tyrol Lienz District Prägraten am Großvenediger Umbal valley Hoher Rosshuf ⓘ Althaus glacier (Rosshuf glacier)	Lapis 29(9):33 (2004)
Schwaz District Finkenberg ⓘ Schlegeis tunnel	Martin Slama collection (SXRD-analysed by Uwe Kolitsch)
Gerlos Schönach valley Plattenscharte - Mitterkopf area ⓘ Mitterkopf (Gerlostaljoch)	Lapis 34 (7-8) (2009) p. 9
ⓘ Zillerkopf northeast slope	Lapis 29(9):30 (2004)
Mayrhofen ⓘ Floitenturm northeast slope	Lapis 29(9):30 (2004)
ⓘ Kleiner Mörchner	Lapis 29(9):32 (2004)
ⓘ Melker Scharte	Lapis 29(9):30-31 (2004)
ⓘ Niedere Barm	Lapis 29(9):31 (2004) R. Dallinger & J. Gufler (2006): Der größte Euklaskristall der Alpen - Neufund im Zillertal. Lapis 31 (3), 28-31. (in German)
ⓘ Saurüssel	Lapis 29(9):31-32 (2004)
Belgium
Wallonia Luxembourg Vielsalm Bihain ⓘ Ottré	Hanson, A. (1985) Découverte d'euclase dans un filon de quartz à Ottré, Massif de Stavelot. Bulletin de Minéralogie, 108, 139. Hatert, F., Deliens, M., Fransolet, A.-M., Van Der Meersche, E. (2002) Les minéraux de Belgique (2nd ed.) Muséum des Sciences Naturelles, Bruxelles.
Brazil
Bahia ⓘ Brumado	Luiz Menezes
Livramento de Nossa Senhora ⓘ Euclase occurrence	Lætitia Gilles-Guéry, Laurence Galoisy, Jurgen Schnellrath, Benoit Baptiste, Georges Calas (2022): Mn3+ and the pink color of gem-quality euclase from northeast Brazil. American Mineralogist 107 (3): 489–494.
Minas Gerais ⓘ Capelinha	Oleg Lopatkin specimen
Conselheiro Pena ⓘ Conselheiro Pena pegmatite district	Richard Dale Collection
Minas Novas ⓘ Calhão creek	No reference listed
ⓘ Olhos-d'Água	photo-1102241
ⓘ Ouro Preto (TL)	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 ⓘ Dom Bosco	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 ⓘ Euclase pegmatite	Van King
ⓘ Capão do Lana mine	Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 168-370.
São Sebastião do Maranhão ⓘ Santana do Encoberto	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 Carnaúba dos Dantas Ermo ⓘ Alto Mirador pegmatite	www.minsocam.org (2004) http://www.minsocam.org/MSA/AmMin/TOC/Articles_Free/2002/Eeckhout_p1297-1306_02.pdf
Equador ⓘ Alto do Giz pegmatite	[www.johnbetts-fineminerals.com] Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 112).
ⓘ Alto do Jacu	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.
ⓘ Alto Santo	Specimens sold by Richard Gaines in 1972-Rock Currier
ⓘ Antonio Leal Farm	De Ascenção Guedes, R., Lebocey, J., Bayle, L.-D., Chappero, P.-J. (2011) Munich 2011. Le Règne Minéral, 17 (102) Les Éditions du Piat. 10-29pp.20-20
ⓘ Mina do Santino pegmatite	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 ⓘ Capoeira 1 pegmatite (Boqueirãozinho pegmatite)	In Coll. Martin Slama
ⓘ Quintos de Cima mine	Fernando Brederodes Collection
Canada
British Columbia Golden Mining Division ⓘ Bugaboo Castles	Canadian Museum of Nature collection
Radium Hot Springs ⓘ Mount Brussilof mine (Bay Mag Mine)	Ray Hill.
Revelstoke Mining Division Revelstoke ⓘ Mount Begbie	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 ⓘ Pegmatite No. 31	Rao, C. Wang, R.-C. Hatert, F. Wu, R.-Q. 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. Wang, Q. (2020) Mineralogy and Geochemistry of Sr-Bearing Phosphates from the Nanping No. 31 Pegmatite (SE China): Implications for Sr Circulation and Post-Magmatic Processes in Granitic Systems. Minerals 10, 541.
Hunan Chenzhou Linwu Co. Xianghualing Sn-polymetallic ore field ⓘ Xianghualing Mine	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 ⓘ Yaogangxian Mine	Ottens, Berthold (2011) The Yaogangxian mine, Hunan Province, China. The Mineralogical Record, 42 (6) 557-603
Inner Mongolia Chifeng City (Ulanhad League; Chifeng Prefecture) Hexigten Banner (Keshiketeng Co.) ⓘ Huanggang Fe-Sn deposit	Ottens, Berthold, Neumeier, Günther (2012) The Huanggang mine, Inner Mongolia, China. The Mineralogical Record, 43 (5) 529-563
Jiangxi Ganzhou Chongyi Co. ⓘ Taoxikeng Mine	Ottens, B. (2009): Lapis 34(10), 31-41
Dayu Co. Xihuashan ore field ⓘ Piaotang Mine	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 ⓘ Chivor Mine	(2002) Emeralds of the World. extraLapis English 2. Lapis International LLCpp.36-45
Western Boyacá Province Pauna ⓘ La Marina Mine	Fabre Minerals.
Cundinamarca Department ⓘ Gachalá	(2002) Emeralds of the World. extraLapis English 2. Lapis International LLCpp.36-45
ⓘ La Vega de San Juan	Chavez-Gil et al. (1997) Vuillet et al. (2002)
Czech Republic
Karlovy Vary Region Cheb District Lázně Kynžvart ⓘ Bílý Kámen pegmatite quarry	Černý, P., Veselovský, F.: Pegmatit Bílý kámen (Weisser Stein) u Kynžvartu. Minerál, 2000, roč. 8, č. 1, s. 10-16.
Olomouc Region Šumperk District Velké Losiny Maršíkov (Marchendorf) ⓘ Rasovna (Schinderhübl)	Toegel, V.: Mineralizace Be pegmatitu „Pod kořeny“ v Maršíkově. Minerál, 2011, roč. 19, č. 3, s. 207-213.
ⓘ Střelecký důl (Scheibengraben)	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) Kimitoön Island ⓘ Rosendal pegmatite	Ilkka Mikkola collection
Germany
Bavaria Upper Franconia Hof District Sparneck Reinersreuth ⓘ Reinersreuth quarry (Köhlerloh quarry)	Weiß, Stefan (1990) Mineralfundstellen Atlas Deutschland West. Christian Weise Verlag, Munich, Germany. 320pp.
Wunsiedel im Fichtelgebirge Kirchenlamitz ⓘ Epprechtstein	Weiß, Stefan (1990) Mineralfundstellen Atlas Deutschland West. Christian Weise Verlag, Munich, Germany. 320pp.
Tröstauer Forst-West ⓘ Fuchsbau quarry	Lapis, 10 (7/8), 15-26+81
ⓘ Zufurt quarry	Lapis,10 (7/8), 40-48.
Weißenstadt ⓘ Lehstenberg quarry	Manfred Früchtl and Martin Slama collections
Rudolfstein ⓘ Schoberth quarry	Wittern, Artur (2001) Mineralfundorte und ihre Minerale in Deutschland (1st ed.) Schweizerbart, Stuttgart.
Weißenstadter Forst-Nord ⓘ Streuspitz	Weiß, Stefan (1990) Mineralfundstellen Atlas Deutschland West. Christian Weise Verlag, Munich, Germany. 320pp.
Saxony Vogtlandkreis Bad Brambach ⓘ B92 Road cuts	Lapis 2002(11), 13-18
Italy
Trentino-Alto Adige (Trentino-South Tyrol) South Tyrol ⓘ Malga Lana (Lahn Alp)	Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
Puster Valley District Ahrntal (Valle Aurina) Steinhaus (Cadipietra) Keilbachspitz ⓘ Sonntagskarl	Lapis 29(9):32-33 (2004)
Prettau (Predoi) ⓘ Cavallo Mountain (Roßhuf Mt.)	Lapis 29(9):33 (2004)
Wipptal (Alta Vall'Isarco) Pfitsch (Val di Vizze) ⓘ Burgum Alp	Gartner, Ar., Gartner An. (2002): Burgum im schönen Pfitschtal. Tipografia Novaprint Cavalese, 126 pp.
Japan
Gifu Prefecture Nakatsugawa City Shimono ⓘ Fukuoka Mine	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 ⓘ Andilamena District	Arliguie M photo & specimen
Itasy Soavinandriana District ⓘ Euclase locality	Moore, Thomas P. (2002) What's New in Minerals - Tucson Show 2002. The Mineralogical Record, 33 (3) 261-275p.273
Vakinankaratra Betafo District Anosiarivo Manapa Manapa pegmatite Field ⓘ Anjanabononoia	In Collection of Martin Slama, obtained from Jochen Hintze
Mozambique
Nampula Province ⓘ Ribaué District	Martin Slama
Zambezia Province ⓘ Alto Ligonha Pegmatite Field	Wilson, Wendell E., Dias, Manuel Bettencourt (2000) Famous Mineral Localities: The Alto Ligonha Pegmatites, Mozambique. The Mineralogical Record, 31 (6) 459-497
Gilé District Muiane-Naipa group ⓘ Muiâne pegmatite (Muiâne mine; Emdal mines)	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.
Mocuba District Mocuba ⓘ Careca pegmatite	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).
ⓘ Lugela pegmatite	Vasco Trancoso specimen & photo, id 184384
Myanmar
Mandalay Region Pyin-Oo-Lwin District Mogok Township Mogok Valley ⓘ Ohn-bin-ywe-htwet (Coconut Tree mine)	Themelis, Ted, 2008, Gems and Mines of Mogok.
Namibia
Erongo Region Karibib Constituency Spitzkopje Area ⓘ Klein Spitzkopje granite stock (Kleine Spitzkoppe; Klein Spitzkoppe)	Cairncross, B. (2005) Famous Mineral Localities: Klein Spitzkoppe, Namibia. Mineralogical Record 36(4) 317-335
ⓘ Stiepelmann Mine	Bezing, L. von, Bode, R. & Jahn, S. (2007): Namibia. Mineralien und Fundstellen. Edition Schloss Freudenstein, Bode Verlag, Haltern, p. 288-290 (in German)
Norway
Agder Iveland ⓘ Eptevatnet 04 Feldspar Quarry (Hovåsen)	Strand, T.(1953): Euclase from Iveland, occurring as an alteration product of beryl. Norsk Geologisk Tidsskrift 31,1-5
Peru
Ancash Pallasca Province Pampas District ⓘ Pasto Bueno	Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254. Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.
Portugal
Braga Terras de Bouro Covide ⓘ Covide quarry	Carlos Augusto Alves Leal Gomes - Mineralizações e Recursos de Tântalo no Norte de Portugal - análise paragenética Asssocição Portuguesa de Geólogos, Geonovas No. 29, pp. 03-42 (2016).
Viseu Mangualde Tavares (Chãs; Várzea e Travanca) ⓘ Bom Sucesso No. 4 quarry	Pedro Alves collection
Russia
Buryatia Kizhinginsky District ⓘ Ermakovskoe Be Deposit	Pavel M. Kartashov data
Chelyabinsk Oblast Plastovsky District ⓘ Andreye-Yulyevsky mine	Vorobyov, V.I. [Воробьевъ, В.И.] (1903) A new euclase specimen from the placers of Southern Urals [О новомъ экземпляръ эвклаза изъ розсыпей Южнаго Урала]. Zapiski Imperatorskago St.-Peterburgskago Mineralogicheskago Obshchestva [Записки Императорскаго С.-Петербургскаго Минералогическаго Общества], 41, 1, 1048-1049 (in Russian) Kolisnichenko, S.V., and Popov, V.A. [Колисниченко, С.В., и Попов, В.А.] (2008) "Russian Brazil" in the Southern Urals. Encyclopedia of Ural Stones ["Русская Бразилия" на Южном Урале. Энциклопедия уральского камня]. Sanarka Publishing House [Издательство Санарка], Chelyabinsk, 528 pp. (in Russian) Kolisnichenko, S.V., Popov, V.A., Yepanchintsev, S.G., and Kuznetsov, A.M. [Колисниченко, С.В., Попов, В.А., Епанчинцев, С.Г., и Кузнецов, А.М.] (2014) All minerals of the Southern Urals. Encyclopedia of Ural Stones [Все минералы Южного Урала. Энциклопедия уральского камня]. Sanarka Publishing House [Издательство Санарка], Chelyabinsk, 624 pp. (in Russian).
Krasnoyarsk Krai Kuragin District ⓘ Raduga Be deposit	Pavel M. Kartashov data Lykhin, D. A., Yarmolyuk, V. V., Vorontsov, A. A., & Travin, A. V. (2019, September). Structure and age of the fluorite-berillium deposit of the field Rainbow, Western Sayan Mountains: to the problem of assessment of metallogenic prospects of the territory. In Доклады Академии наук (Vol. 488, No. 3, pp. 282-287).
Primorsky Krai Khorolsky District ⓘ Voznesenskii ore district	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.
ⓘ Pogranichnoe deposit (Pogranichny deposit)	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
ⓘ Sakha	[World of Stones 12:49]
Sverdlovsk Oblast Malyshevo Malyshevskoe deposit ⓘ Malyshevskaya pit	Avdonin V.N., Polenov Yu.A. (2004) Essays on Uralian minerals, - UGGA press, p. 419 (in Rus.).
Prigorodny District Yuzhakovo ⓘ Alabashka pegmatite field	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.
ⓘ Mokrusha Mine	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 Cadaqués ⓘ Cap de Creus	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)
ⓘ El Port de la Selva	& locality references J. Carreras et al. (1994) Memory of Spanish Geological Map Magna 1:50,000 sheet #221 (Portbou)
Sri Lanka
Sabaragamuwa Province Ratnapura District ⓘ Ratnapura
Sweden
Stockholm County Nynäshamn ⓘ Stora Vika	Gustafsson, Lars, Otter, Bertil (1991) Mineralförekomster i Stockholmstrakten Del 2 [Mineral localities the Stockholm Area Part II]. STEIN. Nordisk magasin for populær geologi, 18 (4) 4-12 Otter, Bertil (2003) Stora Vika- mineralogin [Stora Vika- the mineralogy]. Berg & Mineral. Medlemstidning för Stockholms Amatörgeologiska Sällskap, 13 (40) 21-29
ⓘ Pegmatite B	Gustavsson (Sic!), Lars: (1992): En beryllium paragenes från Stora Vika. Berg & Mineral. 2, nr 3, p.11
Västernorrland County Kramfors ⓘ Sels-Vitberget	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 ⓘ Kolsva	Martensson, C. (1960) Euklas und Bertrandit aus dem Feldspatpegmatit von Kolsva in Schweden. Neues Jahrbuch fiir Mineralogie Abhandlungen, 94, 1248-1252. Nysten,P. & Gustafsson, L.(2006): I jakt på sällsynta mineral. Geologiskt forum nr 49, 22-25
Switzerland
Ticino Leventina Airolo Prevat Valley ⓘ Pizzo Giubine (Giübin)	Lapis 29(9):33-34 (2004)
Vallemaggia Cevio Bavona Valley Robièi (Alpe di Robièi; Lake Robièi area) Cavagnöö Glacier (Cavagnoli Glacier; Cavagnöö area; Cavagnoli area) ⓘ Marchhorn - Pizzo San Giacomo area	Weiß, S., and Wolf, U. (2015) Farbige Turmaline aus dem Cavagnoli-Gebiet, Schweiz. Lapis, 40, 10, 12-17 Weiß, S., and Brack, P. (2018) Tessin. ExtraLapis, 55, 122 pp.
Pizzo dell'Arzo ⓘ Northeast slope	Weiß, S., Bosio, P., and Appiani, R. (2004) L'euclasio del ghiacciaio dei Cavagnoli. Rivista Mineralogica Italiana, 28, 2 (2-2004), 90-93 Weiß, S., Duthaler, R. and Praeger, M. (2004) Von 1881 bis 2003: die Euklasfunde der Alpen, Teil I: Fundstellen in Österreich, Oberitalien und der Südschweiz. Lapis, 29, 9, 23-34 Weiß, S. [mit Beiträgen von Praeger, M., and Duthaler, R.] (2005) Von 1880 bis 2004: Die Euklasfunde der Alpen (II) - Euklas vom Cavagnoli-Gletscher, Tessin, Schweiz. Lapis, 30, 1, 13-24 + 37-39 + 58 Weiß, S., and Brack, P. (2018) Tessin. ExtraLapis, 55, 122 pp.
Tanzania
Morogoro Region Morogoro Rural District ⓘ Mikese	Natural History Museum London collection
UK
England Cornwall Perranzabuloe Perranporth ⓘ Cligga Head	Kingsbury, A.W.G. (1958) Two beryllium minerals new to Britain: euclase and herderite. Mineralogical Magazine, vol. 31, n° 240, 815-817. Golley, Peter, Williams, Richard (1995) Cornish Mineral Reference Manual. Endsleigh Book Co., Truro. 71pp.
Devon West Devon Okehampton Hamlets ⓘ Meldon Aplite Quarry
Ukraine
Zhytomyr Oblast Zhytomyr Raion ⓘ Khoroshiv Raion (Volodarsk-Volynskii)	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 Lost River Valley ⓘ Lost River Mine	Sinkankas, John (1981) Emerald and other beryls. Chilton Book Co, Pennsylvania. 665pp.
ⓘ Rapid River Prospect	(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey
Colorado Chaffee County ⓘ Mt Antero	Van King specimen
Park County Lake George ⓘ Mary Lea-Little Bear Mine (Mary Lee Mine; Little Bear No. 2 Mine)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Lake George Beryllium area (Badger Flats Beryllium area; Mountain Dale) ⓘ A & C Claims (A & C No. 2 Claim; China Wall Cupola)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Badger Flats Area (China Wall Cupola; Boomer Mine; Mary Lee Mine; Redskin Mine)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Black Prince Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Blue Jay Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Boomer Mine (East Boomer; Outhouse Lode; Mammoth Lode; Florman Shaft)	Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
ⓘ Champell Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ China Wall Area	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Happy Thought Mine (Fort De Vincennes)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Hazel Marie Group	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ J & S Group (J & S No. 1; J & S No. 2; J & S No. 3)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Little John Mine (Little John No. 1; Little John No. 2)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Minerva J Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Redskin Gulch	Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
ⓘ Redskin Mine (Redskin Claim; Claims: Papoose; Squaw)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Tennessee Mine (Tennessee No. 2)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Connecticut Fairfield County Trumbull Long Hill ⓘ Old Mine Park (Old Tungsten Mine)	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 County Portland Collins Hill Strickland pegmatite ⓘ Strickland Quarry ?	Harold Moritz collection
Maine Oxford County Albany ⓘ Bumpus Quarry	King, V., 2009, Maine Feldspar, Families, and Feuds.
Sagadahoc County ⓘ Topsham	Don Swenson collection
ⓘ Fisher Quarry	Clifford Trebilcock collection
Michigan ⓘ Marquette County	www.deq.state.mi.us/documents/deq-glm-rcim-geology-Minerals_Found_In_Michigan.Pdf.
New Hampshire Rockingham County Raymond ⓘ Chandler Mine (Pegmatite No. 7)	Francis, C. A. (1985): Minerals of the Chandler Mine, A Zoned Lithium Rich Pegmatite (Rocks and Minerals, 60:263-264) Smith, Arthur E. (2005) New Hampshire mineral locality index. Rocks & Minerals, 80 (4). 242-261 doi:10.3200/rmin.80.4.242-261 Dallaire, Donald (2022) Beryllium Minerals in New Hampshire. Rocks & Minerals, 97 (3) 208-235 doi:10.1080/00357529.2022.2028096
New Mexico Sandoval County ⓘ Cochiti District ?	Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM.
ⓘ Taos County	Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM.
North Carolina Polk County ⓘ Mill's Spring	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 County Quitman Mountains ⓘ Granite Hill prospect ?	R&M 66:3 pp 196-224
Virginia Amelia County Winterham ⓘ Morefield Mine (Morefield pegmatite)	Rocks & Min.: 8:143-144.
Wisconsin Marathon County ⓘ Wausau Intrusive Complex	Cordura, W http://www.uwex.edu/wgnhs/Mineral%20Index/Minerals/euclase.htm
ⓘ Nine Mile pluton	In Collection of Martin Slama, collected and confirmed by Alexander FalsterIdentification: SEM-EDS
Uzbekistan
Tashkent Chatkal-Kuraminskii Range ⓘ Sargardon	Badalov, S.T., Baskakov, S.P., Golovanov, I.M., Ismailov, M.I., Kasymov, A.K., Moiseeva, M.I., Musin, R.A., Smirnova, S.K. [Бадалов, С.Т., Баскаков, С.П., Голованов, И.М., Исмаилов, М.И., Касымов, А.К., Моисеева, М.И., Мусин, Р.А., и Смирнова, С.К.] (1976) Minerals of Uzbekistan. Volume III [Минералы Узбекистана. Том III]. Publishing House "Fan" of the Uzbek SSR [Издательство "Фан" УзССР], Tashkent, 374 pp.
Zimbabwe
Manicaland Makoni District ⓘ The Falls	Cairncross, Bruce (2004) Field Guide to Rocks & Minerals of Southern Africa. 288pp.
Mashonaland West Karoi District ⓘ Mwami (Miami)	Journal of Gemmology 1998, Volume 26 No. 4, 209-218 Bartholomew, D. S. (1990). Base metal and industrial mineral deposits of Zimbabwe. Zimbabwe Geological Survey, Mineral Resources Survey No. 22 Cairncross, Bruce (2004) Field Guide to Rocks & Minerals of Southern Africa. 288pp.
ⓘ Last Hope Mine (Lost Hope Mine)	Cairncross, Bruce (2004) Field Guide to Rocks & Minerals of Southern Africa. 288pp.
ⓘ Mishek	Cairncross, Bruce (2004) Field Guide to Rocks & Minerals of Southern Africa. 288pp.
ⓘ MWM	Cairncross, Bruce (2004) Field Guide to Rocks & Minerals of Southern Africa. 288pp.
ⓘ St Anns Mine (St Anne Mine; St Anne's Mine; St Ann's Mine)	Cairncross, Bruce (2004) Field Guide to Rocks & Minerals of Southern Africa. 288pp.
ⓘ Trim	Cairncross, Bruce (2004) Field Guide to Rocks & Minerals of Southern Africa. 288pp.
ⓘ Rattis Mine	Cairncross, Bruce (2004) Field Guide to Rocks & Minerals of Southern Africa. 288pp.