Euclase
A valid IMA mineral species - grandfathered
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About Euclase
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:
Unique Identifiers
Mindat ID:
1418
Long-form identifier:
mindat:1:1:1418:8
GUID
(UUID V4):
(UUID V4):
8671ded2-ae43-4e3b-90fb-b4ec3ab6d578
IMA Classification of Euclase
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
BeAlSiO4(OH)
First published:
1792
Classification of Euclase
9.AE.10
9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
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
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
16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be
Mineral Symbols
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.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Ecs | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Ecl | The 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 Euclase
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}.
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 Euclase
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.
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 Euclase
Mindat Formula:
BeAl(SiO4)(OH)
Common Impurities:
Zn,F,Ca,Mg,Fe,Na
Crystallography of Euclase
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°
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}.
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 Euclase
Crystal Atlas:
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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 close
X-Ray Powder Diffraction
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Radiation - Copper Kα
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest 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 Euclase
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 Euclase
Other Language Names for Euclase
Common Associates
Associated Minerals Based on Photo Data:
61 photos of Euclase associated with Quartz | SiO2 |
46 photos of Euclase associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
20 photos of Euclase associated with Fluorite | CaF2 |
19 photos of Euclase associated with Albite | Na(AlSi3O8) |
17 photos of Euclase associated with Rutile | TiO2 |
13 photos of Euclase associated with Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
8 photos of Euclase associated with Calcite | CaCO3 |
6 photos of Euclase associated with Adularia | KAlSi3O8 |
4 photos of Euclase associated with Rock Crystal | SiO2 |
3 photos of Euclase associated with Pericline | Na(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
9.AE.05 | Beryllite | Be3(SiO4)(OH)2 · H2O |
9.AE.15 | Sverigeite | NaMnMgSnBe2(SiO4)3(OH) |
9.AE.20 | Hodgkinsonite | Mn2+Zn2(SiO4)(OH)2 |
9.AE.25 | Gerstmannite | MnMgZn(SiO4)(OH)2 |
9.AE.30 | Clinohedrite | CaZn(SiO4) · H2O |
9.AE.35 | Stringhamite | CaCu(SiO4) · H2O |
9.AE.40 | Katoptrite | (Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20 |
9.AE.45 | Yeatmanite | Zn6Mn2+9Sb5+2(SiO4)4O12 |
9.AE.50 | Sphaerobertrandite | Be3(SiO4)(OH)2 |
Other Information
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 Euclase
mindat.org URL:
https://www.mindat.org/min-1418.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Euclase
Reference List:
Mrose, Mary E., von Knorring, Oleg (1959) The mineralogy of väyrynenite, (Mn,Fe)Be(PO4)(OH) Zeitschrift für Kristallographie - Crystalline Materials, 112 (1) 275-288 doi:10.1524/zkri.1959.112.1-6.275 (inc PXRD for euclase)
Mrose, Mary E., Appleman, Daniel E. (1962) The crystal structures and crystal chemistry of väyrynenite, (Mn,Fe)Be(PO4)(OH), and euclase, AlBe(SiO4)(OH) Zeitschrift für Kristallographie - Crystalline Materials, 117 (1) 16-36 doi:10.1524/zkri.1962.117.1.16
Hemingway, Bruce S., Barton, Mark 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 beryllium aluminosilicates: Heat capacity calculations from band assignments. Physics and Chemistry of Minerals, 14 (3) 205-224 doi:10.1007/bf00307985
Localities for Euclase
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Australia | |
| Sue Koepke collection. +1 other reference |
| Pegmatites of Western Australia +2 other references |
Austria | |
| Niedermayr et al. (1995) |
| G. Niedermayr et al.: Carinthia II 194./114.:240-241 (2003) |
| Lapis 29 (9) |
| Lapis 29 (9) |
| Lapis 29 (9) |
Walter (2009) | |
| Bogusch (1988) +1 other reference |
Strasser (1989) | |
Lapis 29 (9) | |
| A. Schermaier: Der Aufschluss 37 (12) |
| Lapis 29 (9) |
| Martin Slama collection (SXRD-analysed by Uwe Kolitsch) |
| Lapis 34 (7-8) |
Lapis 29 (9) | |
| Lapis 29 (9) |
Lapis 29 (9) | |
Lapis 29 (9) | |
Lapis 29 (9) +1 other reference | |
Lapis 29 (9) | |
Belgium | |
| Hanson (1985) +1 other reference |
Brazil | |
| Menezes (n.d.) |
| Gilles-Guéry et al. (2022) |
| Oleg Lopatkin specimen |
| Richard Dale Collection |
| |
photo-1102241 | |
| Sauer (1982) +1 other reference |
| King (n.d.) |
Henwood (1871) | |
| In Collection of Martin Slama |
| Graziani et al. (1980) +1 other reference |
| www.minsocam.org (2004) |
| 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) | |
| In Coll. Martin Slama |
Fernando Brederodes Collection | |
Canada | |
| Canadian Museum of Nature collection |
| Ray Hill. |
| DIXON et al. (2014) +1 other reference |
China | |
| Rao +7 other references |
| Huang et al. (1988) |
| Ottens (2011) |
| Ottens et al. (2012) |
| Ottens (2009) |
| Dr. Lueg collection +1 other reference |
Colombia | |
| - (2002) |
| Fabre Minerals. |
| - (2002) |
Chavez-Gil et al. (1997) +1 other reference | |
Czech Republic | |
| Černý et al. (Weisser Stein) |
| Toegel |
Novák +1 other reference | |
Finland | |
| Ilkka Mikkola collection |
Germany | |
| Weiß (1990) |
| Weiß (1990) |
| Lapis (7/8) |
Rewitzer et al. (1985) | |
| Manfred Früchtl and Martin Slama ... |
| Wittern (2001) |
| Weiß (1990) |
| Lapis 2002 (11) |
Italy | |
| Exel (1987) |
| Lapis 29 (9) |
| Lapis 29 (9) |
| Gartner et al. (2002) |
Japan | |
| Takashi ISHIBASHI et al. |
Madagascar | |
| Arliguie M photo & specimen |
| Bayle et al. (2002) |
Moore (2002) | |
| In Collection of Martin Slama |
Mozambique | |
| Martin Slama |
| Wilson et al. (2000) |
| v. Knorring |
| Moiana (2010) |
Vasco Trancoso specimen & photo | |
Myanmar | |
| Themelis (2008) |
Namibia | |
| Cairncross (2005) |
Bezing et al. (2007) | |
Norway | |
| Strand (1953) |
Peru | |
| Hyrsl et al. (2003) +1 other reference |
Portugal | |
| Carlos Augusto Alves Leal Gomes - ... +1 other reference |
| Pedro Alves collection |
Russia | |
| Pavel.M. Kartashov (n.d.) |
| Vorobyov et al. (1903) +2 other references |
| Pavel.M. Kartashov (n.d.) +1 other reference |
| Bailey |
Ryazantseva (2001) | |
[World of Stones 12:49] | |
| Avdonin V.N. (2004) |
| Sokol et al. (2010) |
Sokol et al. (2010) | |
Spain | |
| & locality references +1 other reference |
| Pura Alfonso - J. C. Melgarejo et al. (2000) |
Sri Lanka | |
| |
Sweden | |
| Gustafsson et al. (1991) +1 other reference |
Gustafsson (1992) | |
| Jonsson et al. (1997) |
| Mårtensson (1960) +1 other reference |
Switzerland | |
| Lapis 29 (9) |
| Weiß et al. (2015) +1 other reference |
| Weiß et al. (2004) +3 other references |
Tanzania | |
| Natural History Museum London collection |
UK | |
| Kingsbury (1958) +1 other reference |
| |
Ukraine | |
| Lyckberg et al. (2009) |
USA | |
| Sinkankas (1981) |
- (2008) | |
| King (n.d.) |
| - (2005) |
| - (2005) |
- (2005) | |
- (2005) | |
- (2005) | |
Eckel et al. (1997) | |
- (2005) | |
- (2005) | |
- (2005) | |
- (2005) | |
- (2005) | |
- (2005) | |
- (2005) | |
Eckel et al. (1997) | |
- (2005) | |
- (2005) | |
| Shepard (1842) +2 other references |
| Moritz (n.d.) |
| King |
| Don Swenson collection |
Clifford Trebilcock collection | |
| ... |
| Francis (1985) +2 other references |
| Northrop et al. (1996) |
Northrop et al. (1996) | |
| Genth +1 other reference |
| Smith (1991) |
| Rocks & Min.: 8:143-144. |
| Cordura |
In Collection of Martin Slama | |
Uzbekistan | |
| Badalov et al. (1976) |
Zimbabwe | |
| Cairncross (2004) |
| Journal of Gemmology 1998 +2 other references |
Cairncross (2004) | |
Cairncross (2004) | |
Cairncross (2004) | |
Cairncross (2004) | |
Cairncross (2004) | |
Cairncross (2004) |
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Floitenturm northeast slope, Mayrhofen, Schwaz District, Tyrol, Austria