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Euclase

Big Photo

Piaotang Mine, Xihuashan intrusion, Dayu Co., Ganzhou Prefecture, Jiangxi Province, China
© Dr. Lueg 2007

Show Euclase Photos (95)
Formula:
BeAl[OH|SiO
 
4
]
System:MonoclinicColour:Colorless, white, pale ...
Hardness:7½
Name:From the greek for easy and fracture, due to good cleavage
This page provides mineralogical data about Euclase.

Classification of Euclase

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/B.01-10
Nickel-Strunz 10th (pending) edition ID:9.AE.10

9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
Dana 8th edition ID: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
Hey's CIM Ref.:16.6.2

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

Type Locality:Ouro Preto, Minas Gerais, Southeast Region, Brazil
Year of Discovery:1792

Occurrences of Euclase

Geological Setting:Decomposition of beryl in pegmatites and alpine veins

Physical Properties of Euclase

Lustre:Vitreous
Diaphaneity (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 (Mohs):7½
Hardness (Vickers):VHN100=1310
Tenacity:Brittle
Cleavage:Perfect
Perfect on {010}
Imperfect on {110} {001}
Fracture:Conchoidal
Density (measured):2.99 - 3.1 g/cm3
Density (calculated):3.115 g/cm3

Crystallography of Euclase

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
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 Volume:V 309.30 ų (Calculated from Unit Cell)
Z:4
Morphology:Prismatic crystals
Crystal Atlas:
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Euclase no.10 - Goldschmidt (1913-1926)
Euclase no.69 - Goldschmidt (1913-1926)
Euclase no.70 - Goldschmidt (1913-1926)

About Crystal Atlas

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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Euclase

Type:Biaxial (+)
RI values: nα = 1.652 nβ = 1.655 nγ = 1.671
2V:Measured: 50° , Calculated: 48°
Maximum Birefringence:δ = 0.019

Chart 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 Euclase

Formula:
BeAl[OH|SiO
 
4
]
Essential elements:Al, Be, H, O, Si
All elements listed in formula:Al, Be, H, O, Si
Common Impurities:Zn,F,Ca,Mg,Fe,Na

Relationship of Euclase to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AE.05Beryllite
Be
 
3
[(OH)
 
2
|SiO
 
4
] · H
 
2
O
9.AE.15Sverigeite
NaMnMgSnBe
 
2
Si
 
3
O
 
12
(OH)
9.AE.20Hodgkinsonite
Mn
2+
 
Zn
 
2
[(OH)
 
2
|SiO
 
4
]
9.AE.25Gerstmannite
(Mg,Mn
2+
 
)Zn[(OH)
 
2
|SiO
 
4
]
9.AE.30Clinohedrite
CaZn[SiO
 
4
] · H
 
2
O
9.AE.35Stringhamite
CaCu[SiO
 
4
] · H
 
2
O
9.AE.40Katoptrite
(Mn
2+
 
,Mg)
 
13
(Al,Fe
3+
 
)
 
4
Sb
5+
2
[O
 
10
|SiO
 
4
]
 
2
9.AE.45Yeatmanite
Mn
2+
7
Zn
 
8
Sb
5+
2
[O
 
3
|SiO
 
4
]
 
4
9.AE.50Sphaerobertrandite
Be
 
3
SiO
 
4
(OH)
 
2
Related Minerals - Hey's Index Grouping:

- +
16.6.1Beryl
Be
 
3
Al
 
2
Si
 
6
O
 
18
16.6.3Bavenite
Ca
 
4
Be
 
2
Al
 
2
Si
 
9
O
 
26
(OH)
 
2
16.6.4Aminoffite
Ca
 
2
(Be,Al)Si
 
2
O
 
7
(OH)·H
 
2
O
16.6.5Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
·H
 
2
O
16.6.6Lovdarite
(Na,K,Ca)
 
4
(Be,Al)
 
2
Si
 
6
O
 
16
·4H
 
2
O
16.6.7Surinamite
(Mg,Fe)
 
3
Al
 
4
BeSi
 
3
O
 
16
16.6.8Ferrotaaffeite-6N'3S
(Be,Zn,Mg)FeAl
 
4
O
 
8

Other Names for Euclase

Synonyms:
Euclasite
Other Languages:
German:Euklas
Euclasit
Russian:Эвклаз
Spanish:Euclasita

Other Information

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

References for Euclase

Reference List:Schweizerische mineralogische und petrographische Mitteilungen: 72: 159-165.

Zeitschrift für Kristallographie: 117: 16-36.

Internet Links for Euclase

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Euclase in the Natural History Museum (London) online catalogue
  • Euclase details from Handbook of Mineralogy (PDF)
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    Localities for Euclase

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Carinthia
      • Hohe Tauern Mts
        • Goldberg group
          • Große Fleiß valley
    		G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
    • Salzburg
      • Hohe Tauern Mts
        • 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 Mt. - Hoher Sonnblick Mt. area
              • Kolm-Saigurn
    		Lapis 29(9):28 (2004)
            • Grieswies - Krumlkeeskopf Mt. area
    		Lapis 29(9):28-29 (2004)
              • 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
            • Hoher Roßhuf Mt. (Pizzo Cavallo)
    		Lapis 29(9):33 (2004)
      • North Tyrol
        • Ziller valley
          • Gerlos valley
            • Schönach valley
    		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)
    Belgium
     
    • Luxembourg Province
      • Stavelot Massif
        • Vielsalm
    		A. Hanson, Bull. Minéral. , 1985, 108, pp. 139-143.
    Brazil
     
    • Northeast Region
      • Bahia
    		Luiz Menezes
      • 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]
    • Southeast Region
      • Minas Gerais
        • Jequitinhonha valley
          • Minas Novas
    		No reference listed
    [MinRec 20:230]
          • Rodrigo Silva
    		http://www.palagems.com/topaz_buyers_guide.htm
        • São Sebastião do Maranhão
    		AmMin 65:183-187 (1980)
    China
     
    • 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.
    • Jiangxi Province
      • Ganzhou Prefecture
        • Chongyi Co.
    		Berthold Ottens (2009) Lapis, 34, #10, 31-41.
        • Dayu Co.
          • Xihuashan intrusion
    		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
        • Chivor
    		Emeralds of the World English extraLapis Vol. 2 2002 pp36-45
    Emeralds of the World English extraLapis Vol. 2 2002 pp36-45
      • Pauna
    		Fabre Minerals.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Lázně Kynžvart
    		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
    		Novák, M.: Maršíkov - Scheibengraben. In Exkurzní průvodce po mineralogických lokalitách na Sobotínsku. Univerzita Palackého v Olomouci, 2002, Olomouc, s. 38-41.
    Finland
     
    • Länsi-Suomen Lääni
      • Kemiö (Kimito) Island
    Germany
     
    • Bavaria
      • Franconia
        • Fichtelgebirge
          • Tröstau
            • Leupoldsdorf
    		Lapis, 10 (7/8), 15-26+81
    Lapis,10 (7/8), 40-48.
          • Weißenstadt
            • Großer Waldstein Mt.
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
            • Kirchenlamitz
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
            • Rudolfstein Mt.
    		Wittern: "Mineralfundorte in Deutschland", 2001
    • Saxony
      • Vogtland
        • Bad Brambach
    		Lapis 2002(11), 13-18
    Italy
     
    • Trentino-Alto Adige
      • Bolzano Province (South Tyrol)
        • Aurina Valley (Ahrnbach Valley)
          • Cadipietra (Steinhaus)
            • Keilbach peak
    		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.
    Mozambique
     
    • Zambezia Province
      • Alto Ligonha District
    		No reference listed
    Namibia
     
    • Erongo Region
      • Swakopmund District
        • Swakopmund
    		Mineralogical Record: 36(4): 317-335.
    Norway
     
    • Aust-Agder
      • Iveland
        • Eptevann (Eftevann)
    		Strand, T.(1953):"Euclase from Iveland, occurring as an alteration product of beryl". Norsk Geologisk Tidsskrift 31,1-5 + Neumann (1985, p. 141).
    Peru
     
    • Ancash Department
      • Pallasca Province
    		Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.; Hyrsl & Rosales (2003) Mineralogical Record, 34, 241-254.
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
    		[World of Stones 12:49]
      • Transbaikalia (Zabaykalye)
        • Buriatia (Buryatia) Republic
    		Pavel M. Kartashov data
    • Urals Region
      • Middle Urals
        • Ekaterinburgskaya (Sverdlovskaya) Oblast'
          • Ekaterinburg (Sverdlovsk)
            • Malyshevo
              • Tokovaya river (Tokovaia river)
    		Pavel M. Kartashov data
    Sri Lanka
     
    • Sabaragamuwa Province
    Sweden
     
    • Ångermanland
      • Kramfors
    		GFF 119, 249
    • Södermanland
      • Nynäshamn
    		Gustafsson, Lars & Otter, Bertil (1991): Mineralförekomster i Stockholmstrakten.Del 2. STEIN 18(4),4-12
    • 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 (Cavagnöö glacier) area
    		Lapis 29(9):34 (2004)
    UK
     
    • England
      • Cornwall
        • St Agnes District
          • Perranzabuloe
    		No reference listed
      • Devon
        • Okehampton area (Northern Dartmoor)
    Ukraine
     
    • Zhytomyr Oblast' (Zhitomir Oblast')
    		No reference listed
    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
      • 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
    		Januzzi, 1976. Mineral Localities of CT and Southeastern NY State
    • 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)
    • 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.
        • Rib Mountain
    Zimbabwe
     
    • Mashonaland West
      • Karoi (Urungwe; Hurungwe) District
    		Journal of Gemmology 1998, Volume 26 No. 4, 209-218
        • Mwami
    		[www.johnbetts-fineminerals.com]
    No reference listed
    Mineral and/or Locality
    Google
     
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