Eucairite
A valid IMA mineral species - grandfathered
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About Eucairite
Formula:
AgCuSe
Colour:
Brilliant creamy white
Lustre:
Metallic
Hardness:
2½
Specific Gravity:
7.6 - 7.8
Crystal System:
Orthorhombic
Name:
For the Greek for opportunity, since it was first found shortly after the description of selenium.
This page provides mineralogical data about Eucairite.
Unique Identifiers
Mindat ID:
1415
Long-form identifier:
mindat:1:1:1415:7
GUID
(UUID V4):
(UUID V4):
15280ebf-2c89-4100-bc90-372e044f76f7
IMA Classification of Eucairite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CuAgSe
Classification of Eucairite
2.BA.50
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
2.4.6.2
2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
3.2.13
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
2 : Sulphides etc. of Ag
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
2 : Sulphides etc. of Ag
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMAâCNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMAâCNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Eca | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Euc | 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 Eucairite
Metallic
Transparency:
Opaque
Colour:
Brilliant creamy white
Comment:
Tarnishes to bright orange
Streak:
Shining
Hardness:
2½ on Mohs scale
Hardness:
VHN25=27 - 31 kg/mm2 - Vickers
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Comment:
Somewhat sectile
Density:
7.6 - 7.8 g/cm3 (Measured) 7.91 g/cm3 (Calculated)
Optical Data of Eucairite
Anisotropism:
Strong olive-brown to steel-blue with a purplish tinge
Colour in reflected light:
Tin-white with faint creamy tinge
Pleochroism:
Weak
Chemistry of Eucairite
Mindat Formula:
AgCuSe
Elements listed:
Crystallography of Eucairite
Crystal System:
Orthorhombic
Cell Parameters:
a = 4.105 Å, b = 4.07 Å, c = 6.31 Å
Ratio:
a:b:c = 1.009 : 1 : 1.55
Unit Cell V:
105.42 Ă
Âł (Calculated from Unit Cell)
Z:
10
Morphology:
Granular masses and blebs
Comment:
Orthorhombic, pseudotetragonal. Point Group: 4/m 2/m 2/m ;Space Group: P4/nmm.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0010578 | Eucairite | Frueh A J, Czamanske G K, Knight C (1957) The crystallography of eucairite, CuAgSe Zeitschrift fur Kristallographie 108 389-396 |  | 1957 | Skrikerum, Sweden | 0 | 293 |
| 0010579 | Eucairite | Frueh A J, Czamanske G K, Knight C (1957) The crystallography of eucairite, CuAgSe Zeitschrift fur Kristallographie 108 389-396 | | 1957 | Skrikerum, Sweden | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.12 Ă | (10) |
| 2.61 Ă | (7) |
| 2.88 Ă | (5) |
| 2.48 Ă | (4) |
| 2.02 Ă | (2) |
| 3.14 Ă | (1) |
| 1.861 Ă | (1) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-đ alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Geological Setting:
Hydrothermal deposits
Type Occurrence of Eucairite
Reference:
Berzelius J (1818) III. Undersökning af nÄgra föreningar, som bero af svagare frÀndskaper 12. Undersökning om fórekommandet af selenium i mineralriket. Afhandlingar i Fysik, Kemi och Mineralogi 6, 134-144
Synonyms of Eucairite
Other Language Names for Eucairite
French:Cuivre Sélénié Argental
Norwegian:Eukairite
Russian:ĐĐČĐșĐ°ĐčŃĐžŃ
Simplified Chinese:çĄéé¶çż
Spanish:Berzelinita
Eucairita
Eucairita
Traditional Chinese:çĄé
é瀊
Common Associates
Associated Minerals Based on Photo Data:
| 39 photos of Eucairite associated with Clausthalite | PbSe |
| 31 photos of Eucairite associated with Berzelianite | Cu2-xSe (x â 0.12) |
| 21 photos of Eucairite associated with Umangite | Cu3Se2 |
| 19 photos of Eucairite associated with Calcite | CaCO3 |
| 12 photos of Eucairite associated with Tiemannite | HgSe |
| 9 photos of Eucairite associated with Hakite-(Hg) | Cu6(Cu4Hg2)Sb4Se12Se |
| 7 photos of Eucairite associated with Klockmannite | CuSe |
| 7 photos of Eucairite associated with Uraninite | UO2 |
| 4 photos of Eucairite associated with Coffinite | U(SiO4) · nH2O |
| 4 photos of Eucairite associated with Pitchblende | UO2 |
Related Minerals - Strunz-mindat Grouping
| 2.BA. | Orileyite | (Fe,Cu)2As |
| 2.BA. | Alburnite | Ag8GeTe2S4 |
| 2.BA. | DzierĆŒanowskite | CaCu2S2 |
| 2.BA. | Makotoite | Ag12(Cu3Au)S8 |
| 2.BA. | Xuwenyuanite | Ag9Fe3+Te2S4 |
| 2.BA.05 | Chalcocite | Cu2S |
| 2.BA.05 | Djurleite | Cu31S16 |
| 2.BA.05 | Geerite | Cu8S5 |
| 2.BA.05 | Roxbyite | Cu9S5 |
| 2.BA.10 | Anilite | Cu7S4 |
| 2.BA.10 | Digenite | Cu9S5 |
| 2.BA.15 | Bornite | Cu5FeS4 |
| 2.BA.20 | Bellidoite | Cu2Se |
| 2.BA.20 | Berzelianite | Cu2-xSe (x â 0.12) |
| 2.BA.25 | Athabascaite | Cu5Se4 |
| 2.BA.25 | Umangite | Cu3Se2 |
| 2.BA.30 | Rickardite | Cu7Te5 |
| 2.BA.30 | Weissite | Cu2-xTe |
| 2.BA.35 | Acanthite | Ag2S |
| 2.BA.35 | Spryite | Ag8(As3+0.5As5+0.5)S6 |
| 2.BA.40 | Mckinstryite | Ag5-xCu3+xS4 |
| 2.BA.40 | Stromeyerite | AgCuS |
| 2.BA.40d | UM2003-13-S:AgAuCu | Ag6AuCu2S5 |
| 2.BA.42 | Honeaite | Au3TlTe2 |
| 2.BA.45 | Jalpaite | Ag3CuS2 |
| 2.BA.45 | Kurilite | Ag8Te3Se |
| 2.BA.45 | Selenojalpaite | Ag3CuSe2 |
| 2.BA.47 | Spiridonovite | (Cu1-xAgx)2Te |
| 2.BA.50 | Wuyanzhiite | Cu2S |
| 2.BA.52 | Argentite | Ag2S |
| 2.BA.55 | Aguilarite | Ag4SeS |
| 2.BA.55 | Naumannite | Ag2Se |
| 2.BA.60 | Cervelleite | Ag4TeS |
| 2.BA.60 | Hessite | Ag2Te |
| 2.BA.60 | Chenguodaite | Ag9Fe3+Te2S4 |
| 2.BA.65 | Henryite | (Cu,Ag)3+xTe2 , with x ~ 0.40 |
| 2.BA.65 | StĂŒtzite | Ag5-xTe3, x = 0.24-0.36 |
| 2.BA.70 | Argyrodite | Ag8GeS6 |
| 2.BA.70 | Canfieldite | Ag8SnS6 |
| 2.BA.70 | Putzite | (Cu4.7Ag3.3)GeS6 |
| 2.BA.75 | Fischesserite | Ag3AuSe2 |
| 2.BA.75 | Penzhinite | (Ag,Cu)4Au(S,Se)4 |
| 2.BA.75 | Petrovskaite | AuAgS |
| 2.BA.75 | Petzite | Ag3AuTe2 |
| 2.BA.75 | Uytenbogaardtite | Ag3AuS2 |
| 2.BA.80 | Bezsmertnovite | (Au,Ag)4Cu(Te,Pb) |
| 2.BA.80 | Bilibinskite | PbCu2Au3Te2 |
| 2.BA.80 | Bogdanovite | (Au,Te,Pb)3(Cu,Fe) |
Other Information
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 Eucairite
mindat.org URL:
https://www.mindat.org/min-1415.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Eucairite
Reference List:
Localities for Eucairite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Paar (1996) |
| M.K. de Brodtkorb (ed.) |
| Anthony et al. (1990) | |
| Paar et al. (2004) |
| Marquez-Zavalia et al. (2021) | |
| Economic Geology (1997) |
| Guerrero (1969) | |
| de Brodtkorb et al. (2010) | |
| DE BRODTKORB +2 other references | |
| Milka K. de BRODTKORB and Sabrina CROSTA (2010) | |
| Paar et al. (2002) +1 other reference | |
| Economic Geology (1997) | |
| Recursos Minerales de la Republica ... +3 other references | |
| Grundmann et al. (2018) |
| Econ Geol (1997) +1 other reference |
| Dana 6:53. +1 other reference |
Australia | |
| Segnit +1 other reference |
| Sorrell (n.d.) |
| Econ Geol (1997) |
Bulgaria | |
| American Mineralogist (1966) +1 other reference |
| Singer et al. (2008) +1 other reference |
Canada | |
| G.S.C. Bulletin 330. +1 other reference |
| Thorpe et al. (1976) +3 other references |
| Can Min 10:787-796 |
| Canadian Mineralogist Vol. 10 (1972) +2 other references | |
Chile | |
| Atlas of Ore Minerals (1982) |
China | |
| Zhi Li et al. (1973) +2 other references |
Czech Republic | |
| Ć kĂĄcha et al. (2017) |
| Anthony et al. (1990) |
| Sejkora et al. (2014) |
| Sejkora et al. (2022) |
| ScharmovĂĄ et al. (1995) |
| Econ Geol (1997) +1 other reference |
| Ć ouba |
| KvaÄek +1 other reference |
| KvaÄek +1 other reference | |
| VavĆĂn +1 other reference |
| KvaÄek (1979) +1 other reference | |
France | |
| Econ Geol (1997) |
Germany | |
| Kopp et al. (2012) |
| Belendorff (2021) |
| Wittern (2001) |
| WeiĂ (1990) |
| WeiĂ (1990) |
| Schaarschmidt (2007) +1 other reference |
| Wittern (2001) |
| Förster (2004) +2 other references |
| Forster et al. (2003) |
Greenland | |
| Anthony et al. (1990) +1 other reference |
Middle East | |
| Vapnik et al. (2014) | |
Norway | |
| Pavel M. Kartashov analytical data (2005) |
Poland | |
| Anthony et al. (1990) |
| Galuskin E. & SzeĆÄg E. 2003: The first finding of Ag-amalgamates in rodingites (NasĆawice, Lower Silesia, Poland) |
Romania | |
| www.minerals-of-the-carpathians +1 other reference |
Sweden (TL) | |
| [Zeitschrift fĂŒr Kristallographie et al. (1957) +3 other references |
UK | |
| Stanley et al. (1990) +1 other reference |
USA | |
| Eckel et al. (1997) |
| Eckel et al. (1997) +1 other reference |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Tharalson +5 other references | |
| Castor et al. (2004) |
| Carter et al. (1965) +1 other reference |
Uzbekistan | |
| Koneev et al. (2005) |
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PĆedboĆice deposit, PĆedboĆice, KovĂĄĆov, PĂsek District, South Bohemian Region, Czech Republic