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Euclase

A valid IMA mineral species - grandfathered
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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, pink
Lustre:
Vitreous
Hardness:
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.

Unique IdentifiersHide

Mindat ID:
1418
Long-form identifier:
mindat:1:1:1418:8
GUID
(UUID V4):
8671ded2-ae43-4e3b-90fb-b4ec3ab6d578

IMA Classification of EuclaseHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
BeAlSiO4(OH)
First published:
1792

Classification of EuclaseHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
EcsIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
EclThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

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, pink
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
Optical Extinction:
Z ∧ c = 41°.
Pleochroism:
Visible
Comments:
Shades of deep blue

Chemistry of EuclaseHide

Mindat Formula:
BeAl(SiO4)(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.

Forms include {100}, {010}, {001}(rare), {20·1·0}, {16·1·0}, 910}, {410}, {320}, {430}, {650}, {110}, {9·10·0}, {670}, {340}, {230}, {590}, {120}, {130}, {104}, {102}, {101}, {011}, {0·11·6}, {021}, {0·11·4}, {031}, {041}, {061}, {111}, {332}, {112}, {111}, {221}, {323}, {12·3·1}, {211}, {124}, {121}, {141}, {155}, {151}, {231}, {6·10·1}, {593}, {121}, {131}, {142}, {162}, {152}, {2·13·5}, {2·13·4}, {173}, {182}, {197}.

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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Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001036EuclaseHazen R M, Au A Y, Finger L W (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) American Mineralogist 71 977-98419860293
0001037EuclaseHazen R M, Au A Y, Finger L W (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) American Mineralogist 71 977-98419860293
0001038EuclaseHazen R M, Au A Y, Finger L W (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) American Mineralogist 71 977-98419860293
0001039EuclaseHazen R M, Au A Y, Finger L W (1986) High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) American Mineralogist 71 977-98419860293
0017971EuclaseBiscoe J, Warren B (1933) The structure of Euclase H Be Al Si O5 _cod_database_code 1011072 Zeitschrift fur Kristallographie 86 292-29719330293
0010591EuclaseMrose 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 16-361962Villa Rica, Minas Gerais, Brazil0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Image Loading

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

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
Geological Setting:
Decomposition of beryl in pegmatites and alpine veins

Type Occurrence of EuclaseHide

Place of Conservation of Type Material:
Natural History Museum, Paris, France. The IMA Commission on Museums gives the number as 3300, the Handbook of Mineralogy gives 3303.
Reference:
Hauy, R.J. (1792) De l´euclase. Observations sur la Physique, sur l’Histoire Naturelle et sur les Arts: 41: 155-156.

Synonyms of EuclaseHide

Other Language Names for EuclaseHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
61 photos of Euclase associated with QuartzSiO2
46 photos of Euclase associated with MuscoviteKAl2(AlSi3O10)(OH)2
20 photos of Euclase associated with FluoriteCaF2
19 photos of Euclase associated with AlbiteNa(AlSi3O8)
17 photos of Euclase associated with RutileTiO2
13 photos of Euclase associated with SchorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
8 photos of Euclase associated with CalciteCaCO3
6 photos of Euclase associated with AdulariaKAlSi3O8
4 photos of Euclase associated with Rock CrystalSiO2
3 photos of Euclase associated with PericlineNa(AlSi3O8)

Related Minerals - Strunz-mindat 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. 2/m : P21/b
9.AE.25GerstmanniteMnMgZn(SiO4)(OH)2Orth. mmm (2/m 2/m 2/m)
9.AE.30ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
9.AE.35StringhamiteCaCu(SiO4) · H2OMon. 2/m : P21/b
9.AE.40Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20Mon. 2/m : B2/m
9.AE.45YeatmaniteZn6Mn2+9Sb5+2(SiO4)4O12Tric. 1 : P1
9.AE.50SphaerobertranditeBe3(SiO4)(OH)2Mon. 2/m : P21/b

Other InformationHide

Thermal Behaviour:
In a closed tube, gives off water when strongly heated. Before the blowpipe, cracks and whitens, throws out fragments; fuses at 5.5 to a white enamel.
Notes:
No reaction to acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for EuclaseHide

References for EuclaseHide

Reference List:

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 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
Sue Koepke collection. +1 other reference
    • Yalgoo Shire
      • Dalgaranga Station
Pegmatites of Western Australia +2 other references
Austria
 
  • Carinthia
    • Spittal an der Drau District
      • Heiligenblut am Großglockner
        • Große Fleiß valley
Niedermayr et al. (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)
      • Rauris
        • Alteck - Hoher Sonnblick area
          • Kolm-Saigurn
Lapis 29 (9)
        • Grieswies - Krumlkeeskopf area
Lapis 29 (9)
Walter (2009)
          • Grieswies
Bogusch (1988) +1 other reference
Strasser (1989)
Lapis 29 (9)
        • Kruml glacier
A. Schermaier: Der Aufschluss 37 (12)
  • Tyrol
    • Lienz District
      • Prägraten am Großvenediger
        • Umbal valley
          • Hoher Rosshuf
Lapis 29 (9)
    • Schwaz District
      • Finkenberg
Martin Slama collection (SXRD-analysed by Uwe Kolitsch)
      • Gerlos
        • Schönach valley
          • Plattenscharte - Mitterkopf area
Lapis 34 (7-8)
Lapis 29 (9)
      • Mayrhofen
Lapis 29 (9)
Lapis 29 (9)
Lapis 29 (9)
Lapis 29 (9) +1 other reference
Lapis 29 (9)
Belgium
 
  • Wallonia
    • Luxembourg
      • Vielsalm
        • Bihain
Hanson (1985) +1 other reference
Brazil
 
  • Bahia
Menezes (n.d.)
    • Livramento de Nossa Senhora
Gilles-Guéry et al. (2022)
  • Minas Gerais
Oleg Lopatkin specimen
    • Conselheiro Pena
Richard Dale Collection
    • Minas Novas
photo-1102241
Sauer (1982) +1 other reference
      • Rodrigo Silva
        • Boa Vista
King (n.d.)
Henwood (1871)
    • São José da Safira
In Collection of Martin Slama
    • São Sebastião do Maranhão
Graziani et al. (1980) +1 other reference
  • Rio Grande do Norte
    • Carnaúba dos Dantas
      • Ermo
www.minsocam.org (2004)
    • Equador
Sauer (1982) +1 other reference
Palinkaš et al. (2014)
Specimens sold by Richard Gaines in ...
De Ascenção Guedes et al. (2011)
Palinkaš et al. (2014)
    • Parelhas
In Coll. Martin Slama
Fernando Brederodes Collection
Canada
 
  • British Columbia
    • Golden Mining Division
Canadian Museum of Nature collection
      • Radium Hot Springs
Ray Hill.
    • Revelstoke Mining Division
      • Revelstoke
DIXON et al. (2014) +1 other reference
China
 
  • Fujian
    • Nanping
      • Yanping District
        • Nanping pegmatite field
Rao +7 other references
  • Hunan
    • Chenzhou
      • Linwu Co.
        • Xianghualing Sn-polymetallic ore field
Huang et al. (1988)
      • Yizhang Co.
        • Yaogangxian W-Sn ore field
Ottens (2011)
  • Inner Mongolia
    • Chifeng City (Ulanhad League; Chifeng Prefecture)
      • Hexigten Banner (Keshiketeng Co.)
Ottens et al. (2012)
  • Jiangxi
    • Ganzhou
      • Chongyi Co.
Ottens (2009)
      • Dayu Co.
        • Xihuashan ore field
Dr. Lueg collection +1 other reference
Colombia
 
  • Boyacá Department
    • Chivor
- (2002)
    • Western Boyacá Province
      • Pauna
Fabre Minerals.
  • Cundinamarca Department
- (2002)
Chavez-Gil et al. (1997) +1 other reference
Czech Republic
 
  • Karlovy Vary Region
    • Cheb District
      • Lázně Kynžvart
Černý et al. (Weisser Stein)
  • Olomouc Region
    • Šumperk District
      • Velké Losiny
        • Maršíkov (Marchendorf)
Toegel
Novák +1 other reference
Finland
 
  • Southwest Finland
    • Kimitoön (Kemiönsaari)
      • Kimitoön Island
Ilkka Mikkola collection
Germany
 
  • Bavaria
    • Upper Franconia
      • Hof District
        • Sparneck
          • Reinersreuth
Weiß (1990)
      • Wunsiedel im Fichtelgebirge
        • Kirchenlamitz
Weiß (1990)
        • Tröstauer Forst-West
Lapis (7/8)
Rewitzer et al. (1985)
        • Weißenstadt
Manfred Früchtl and Martin Slama ...
          • Rudolfstein
Wittern (2001)
        • Weißenstadter Forst-Nord
Weiß (1990)
  • Saxony
    • Vogtlandkreis
      • Bad Brambach
Lapis 2002 (11)
Italy
 
  • Trentino-Alto Adige (Trentino-South Tyrol)
    • South Tyrol
Exel (1987)
      • Puster Valley District
        • Ahrntal (Valle Aurina)
          • Steinhaus (Cadipietra)
            • Keilbachspitz
Lapis 29 (9)
        • Prettau (Predoi)
Lapis 29 (9)
      • Wipptal (Alta Vall'Isarco)
        • Pfitsch (Val di Vizze)
Gartner et al. (2002)
Japan
 
  • Gifu Prefecture
    • Nakatsugawa City
      • Shimono
Takashi ISHIBASHI et al.
Madagascar
 
  • Alaotra-Mangoro
Arliguie M photo & specimen
  • Itasy
    • Soavinandriana District
Bayle et al. (2002)
Moore (2002)
  • Vakinankaratra
    • Betafo District
      • Anosiarivo Manapa
        • Manapa pegmatite Field
In Collection of Martin Slama
Mozambique
 
  • Nampula Province
Martin Slama
  • Zambezia Province
Wilson et al. (2000)
    • Gilé District
      • Muiane-Naipa group
v. Knorring
    • Mocuba District
      • Mocuba
Moiana (2010)
Vasco Trancoso specimen & photo
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Mogok Valley
Themelis (2008)
Namibia
 
  • Erongo Region
    • Dâures Constituency
      • Spitzkopje Area
Cairncross (2005)
Bezing et al. (2007)
Norway
 
  • Agder
    • Iveland
Strand (1953)
Peru
 
  • Ancash
    • Pallasca Province
      • Pampas District
Hyrsl et al. (2003) +1 other reference
Portugal
 
  • Braga
    • Terras de Bouro
      • Covide
Carlos Augusto Alves Leal Gomes - ... +1 other reference
  • Viseu
    • Mangualde
      • Tavares (Chãs; Várzea e Travanca)
Pedro Alves collection
Russia
 
  • Buryatia
    • Kizhinginsky District
Pavel.M. Kartashov (n.d.)
  • Chelyabinsk Oblast
    • Plastovsky District
Vorobyov et al. (1903) +2 other references
  • Krasnoyarsk Krai
    • Kuragin District
Pavel.M. Kartashov (n.d.) +1 other reference
  • Primorsky Krai
    • Khorolsky District
Bailey
Ryazantseva (2001)
[World of Stones 12:49]
  • Sverdlovsk Oblast
    • Malyshevo
      • Malyshevskoe deposit
Avdonin V.N. (2004)
    • Prigorodny District
      • Yuzhakovo
Sokol et al. (2010)
Sokol et al. (2010)
Spain
 
  • Catalonia
    • Girona
      • Alt Empordà
& locality references +1 other reference
      • Cadaqués
Pura Alfonso - J. C. Melgarejo et al. (2000)
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
Sweden
 
  • Stockholm County
    • Nynäshamn
Gustafsson et al. (1991) +1 other reference
Gustafsson (1992)
  • Västernorrland County
    • Kramfors
Jonsson et al. (1997)
  • Västmanland County
    • Köping
Mårtensson (1960) +1 other reference
Switzerland
 
  • Ticino
    • Leventina
      • Airolo
        • Prevat Valley
Lapis 29 (9)
    • Vallemaggia
      • Cevio
        • Bavona Valley
          • Robièi (Alpe di Robièi; Lake Robièi area)
            • Cavagnöö Glacier (Cavagnoli Glacier; Cavagnöö area; Cavagnoli area)
Weiß et al. (2015) +1 other reference
              • Pizzo dell'Arzo
Weiß et al. (2004) +3 other references
Tanzania
 
  • Morogoro Region
    • Morogoro Rural District
Natural History Museum London collection
UK
 
  • England
    • Cornwall
      • Perranzabuloe
        • Perranporth
Kingsbury (1958) +1 other reference
    • Devon
      • West Devon
        • Okehampton Hamlets
Ukraine
 
  • Zhytomyr Oblast
    • Zhytomyr Raion
Lyckberg et al. (2009)
USA
 
  • Alaska
    • Nome Census Area
      • Port Clarence Mining District
        • Lost River Valley
Sinkankas (1981)
- (2008)
  • Colorado
    • Chaffee County
King (n.d.)
    • Park County
      • Lake George
- (2005)
      • Lake George Beryllium area (Badger Flats Beryllium area; Mountain Dale)
- (2005)
- (2005)
- (2005)
- (2005)
Eckel et al. (1997)
- (2005)
- (2005)
- (2005)
- (2005)
- (2005)
- (2005)
- (2005)
Eckel et al. (1997)
- (2005)
- (2005)
  • Connecticut
    • Fairfield County
      • Trumbull
        • Long Hill
Shepard (1842) +2 other references
    • Middlesex County
      • Portland
        • Collins Hill
          • Strickland pegmatite
Moritz (n.d.)
  • Maine
    • Oxford County
      • Albany
King
    • Sagadahoc County
Don Swenson collection
Clifford Trebilcock collection
  • Michigan
...
  • New Hampshire
    • Rockingham County
      • Raymond
Francis (1985) +2 other references
  • New Mexico
    • Sandoval County
Northrop et al. (1996)
Northrop et al. (1996)
  • North Carolina
    • Polk County
Genth +1 other reference
  • Texas
    • Hudspeth County
      • Quitman Mountains
Smith (1991)
  • Virginia
    • Amelia County
      • Winterham
Rocks & Min.: 8:143-144.
  • Wisconsin
    • Marathon County
Cordura
In Collection of Martin Slama
Uzbekistan
 
  • Tashkent
    • Chatkal-Kuraminskii Range
Badalov et al. (1976)
Zimbabwe
 
  • Manicaland
    • Makoni District
Cairncross (2004)
  • Mashonaland West
    • Karoi District
Journal of Gemmology 1998 +2 other references
Cairncross (2004)
Cairncross (2004)
Cairncross (2004)
Cairncross (2004)
Cairncross (2004)
Cairncross (2004)
 
Mineral and/or Locality  
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