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Eucairite

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Formula:
AgCuSe
Colour:
Brilliant creamy white
Lustre:
Metallic
Hardness:
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.


Hide all sections | Show all sections

Classification of EucairiteHide

Approved, 'Grandfathered' (first described prior to 1959)
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
2.4.6.2

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

Physical Properties of EucairiteHide

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 EucairiteHide

Type:
Anisotropic
Anisotropism:
Strong olive-brown to steel-blue with a purplish tinge
Colour in reflected light:
Tin-white with faint creamy tinge
Pleochroism:
Weak

Chemical Properties of EucairiteHide

Formula:
AgCuSe
IMA Formula:
CuAgSe

Crystallography of EucairiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 4.1 Å, b = 4.07 Å, c = 6.31 Å
Ratio:
a:b:c = 1.007 : 1 : 1.55
Unit Cell V:
105.29 ų (Calculated from Unit Cell)
Morphology:
Granular masses and blebs

Type Occurrence of EucairiteHide

Synonyms of EucairiteHide

Other Language Names for EucairiteHide

Common AssociatesHide

BerzelianiteCu2Se
CalciteCaCO3
ChalcomeniteCuSeO3 · 2H2O
ClausthalitePbSe
CrookesiteCu7(Tl, Ag)Se4
KlockmanniteCuSe
MalachiteCu2(CO3)(OH)2
TiemanniteHgSe
UmangiteCu3Se2
WeissiteCu2-xTe
Associated Minerals Based on Photo Data:
Berzelianite18 photos of Eucairite associated with Berzelianite on mindat.org.
Clausthalite18 photos of Eucairite associated with Clausthalite on mindat.org.
Umangite7 photos of Eucairite associated with Umangite on mindat.org.
Hakite6 photos of Eucairite associated with Hakite on mindat.org.
Calcite5 photos of Eucairite associated with Calcite on mindat.org.
Coffinite4 photos of Eucairite associated with Coffinite on mindat.org.
Pitchblende4 photos of Eucairite associated with Pitchblende on mindat.org.
Uraninite4 photos of Eucairite associated with Uraninite on mindat.org.
Tiemannite4 photos of Eucairite associated with Tiemannite on mindat.org.
Sabatierite3 photos of Eucairite associated with Sabatierite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.BA.05ChalcociteCu2SMon. 2/m : P21/b
2.BA.05DjurleiteCu31S16Mon. 2/m
2.BA.05GeeriteCu8S5Trig. 3
2.BA.05RoxbyiteCu9S5Tric. 1 : P1
2.BA.10AniliteCu7S4Orth. mmm (2/m 2/m 2/m) : Pnma
2.BA.10DigeniteCu9S5Trig. 3m (3 2/m) : R3m
2.BA.15BorniteCu5FeS4Orth. mmm (2/m 2/m 2/m) : Pbca
2.BA.20BellidoiteCu2SeTet. 4/m : P42/n
2.BA.20BerzelianiteCu2SeIso. m3m (4/m 3 2/m) : Fm3m
2.BA.25AthabascaiteCu5Se4Orth.
2.BA.25UmangiteCu3Se2Tet.
2.BA.30RickarditeCu7Te5Orth.
2.BA.30WeissiteCu2-xTeHex.
2.BA.35AcanthiteAg2SMon. 2/m : P21/m
2.BA.40MckinstryiteAg5-xCu3+xS4Orth. mmm (2/m 2/m 2/m) : Pnma
2.BA.40StromeyeriteAgCuSOrth. mmm (2/m 2/m 2/m)
2.BA.40dUM2003-13-S:AgAuCuAg6AuCu2S5
2.BA.45JalpaiteAg3CuS2Tet.
2.BA.45SelenojalpaiteAg3CuSe2Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
2.BA.55AguilariteAg4SeSMon. 2/m
2.BA.55NaumanniteAg2SeOrth. 2 2 2 : P21 21 21
2.BA.60CervelleiteAg4TeSMon. 2/m
2.BA.60HessiteAg2TeMon. 2/m : P21/b
2.BA.60ChenguodaiteAg9Fe3+Te2S4Orth.
2.BA.65Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40 Iso. m3m (4/m 3 2/m) : Fd3c
2.BA.65StütziteAg5-xTe3, x = 0.24-0.36Hex.
2.BA.70ArgyroditeAg8GeS6Orth. mm2 : Pna21
2.BA.70CanfielditeAg8SnS6Orth. mm2
2.BA.70Putzite(Cu4.7Ag3.3)GeS6Iso. 4 3m : F4 3m
2.BA.75FischesseriteAg3AuSe2Iso. 4 3 2 : I41 3 2
2.BA.75Penzhinite(Ag,Cu)4Au(S,Se)4Hex.
2.BA.75PetrovskaiteAuAg(S,Se)Mon.
2.BA.75PetziteAg3AuTe2Iso. 4 3 2 : I41 3 2
2.BA.75UytenbogaardtiteAg3AuS2Trig. 3m (3 2/m) : R3c
2.BA.80Bezsmertnovite(Au,Ag)4Cu(Te,Pb)Orth.
2.BA.80BilibinskitePbCu2Au3Te2Iso.
2.BA.80Bogdanovite(Au,Te,Pb)3(Cu,Fe)Iso.

Related Minerals - Dana Grouping (8th Ed.)Hide

2.4.6.1StromeyeriteAgCuSOrth. mmm (2/m 2/m 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.2.1AcanthiteAg2SMon. 2/m : P21/m
3.2.3NaumanniteAg2SeOrth. 2 2 2 : P21 21 21
3.2.4AguilariteAg4SeSMon. 2/m
3.2.5HessiteAg2TeMon. 2/m : P21/b
3.2.6EmpressiteAgTeOrth. mmm (2/m 2/m 2/m)
3.2.7StütziteAg5-xTe3, x = 0.24-0.36Hex.
3.2.8CervelleiteAg4TeSMon. 2/m
3.2.9DervilliteAg2AsS2Mon. 2/m : P2/b
3.2.10StromeyeriteAgCuSOrth. mmm (2/m 2/m 2/m)
3.2.11MckinstryiteAg5-xCu3+xS4Orth. mmm (2/m 2/m 2/m) : Pnma
3.2.12JalpaiteAg3CuS2Tet.
3.2.14CameroniteCu5-x(Cu,Ag)3+xTe10 (x = 0.43)Mon. 2/m : B2/b
3.2.15Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40 Iso. m3m (4/m 3 2/m) : Fd3c
3.2.16SternbergiteAgFe2S3Orth. mmm (2/m 2/m 2/m)
3.2.17ArgentopyriteAgFe2S3Mon. 2/m
3.2.18Geffroyite(Cu,Fe,Ag)9(Se,S)8Iso. m3m (4/m 3 2/m) : Fm3m
3.2.19ArgentopentlanditeAg(Fe,Ni)8S8Iso. m3m (4/m 3 2/m) : Fm3m

Other InformationHide

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

References for EucairiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 183-184.
Zeitschrift für Kristallographie: 108: 389-391.

Internet Links for EucairiteHide

Localities for EucairiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina
 
  • La Rioja
    • Chilecito department
      • Sañogasta
M.K. de Brodtkorb (ed.) (2002) Las Especies Minerales de la Republica Argentina, (Asociacion Mineralogica Argentina)
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
    • Famatina department
      • Famatina
        • Puerto Alegre
Paar, et al. (1996): Revista de la Asociacion Geologica Argentina 51 (4):304-312
    • General Lamadrid department
      • Los Llantenes district
Canadian Mineralogist Vol. 42, 1745-1755 (2004).
      • Villa Castelli
Economic Geology (1997) 92, 468-484.
Guerrero, M.A. (1969) Estudio geológico-económico y prospección geoquímica orientativa del Distrito Minero Cerro Cacho – Sierra de Umango. Dirección Nacional de Geología y Minería, (inédito), 171 p., Buenos Aires.
de Brodtkorb, M. K., & Crosta, S. (2010). Reseña de la ubicación geográfica de los seleniuros de la Sierra de Umango, provincia de La Rioja. Revista de la Asociación Geológica Argentina, 67(2), 272-279.
DE BRODTKORB, Milka K. Precious metaltellurides and other Te-bearing minerals in different paragenesis of Argentina: A review. Rev. Asoc. Geol. Argent. [online]. 2009, vol.64, n.3, pp. 365-372.; Paar, W. H., Putz, H., Topa, D., de Brodtkorb, M. K., & Sureda, R. J. (2005, January). Occurrence and paragenesis of tellurium in mineral deposits of Argentina. In Mineral Deposit Research: Meeting the Global Challenge (pp. 1419-1422). Springer Berlin Heidelberg.
Milka K. de BRODTKORB and Sabrina CROSTA (2010) RESEÑA DE LA UBICACIÓN GEOGRÁFICA DE LOS SELENIUROS DE LA SIERRA DE UMANGO, PROVINCIA DE LA RIOJA. Revista de la Asociación Geológica Argentina 67 (2), 272 - 277.
de Brodtkorb, M. K., & Crosta, S. (2010). Reseña de la ubicación geográfica de los seleniuros de la Sierra de Umango, provincia de La Rioja. Revista de la Asociación Geológica Argentina, 67(2), 272-279.
Economic Geology (1997) 92, 468-484.
No reference listed
    • Vinchina Department
Recursos Minerales de la Republica Argentina, E. O. Zappettini Ed., Buenos Aires 1999 ISSN 0328-2325
  • Mendoza
    • Luján de Cuyo department
      • Cacheuta
Econ Geol (1997) 92:468-484
          • Cerro de Cacheuta
Dana 6:53.
Australia
 
  • Queensland
    • Cook Shire
Econ Geol (1997) 92:468-484; Segnit, ER, 1980, An occurrence of rare selenide minerals at the Dianne Mine, Queensland. Australian Mineralogist. 33, p168-169.
  • South Australia
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
www.crocoite.com (Steve Sorrell) and refs therein
  • Western Australia
    • Kalgoorlie-Boulder Shire
      • Kalgoorlie-Boulder
        • Golden Mile Mines
Econ Geol (1997) 92:468-484
Bulgaria
 
  • Sofiya Oblast (Sofia Oblast)
    • Chelopech
American Mineralogist (1966): 51: 29-36
    • Zlatitsa Obshtina
      • Zlatitsa
Singer, D.A., Berger, V.I., and Moring, B.C. (2008): US Geological Survey Open-File Report 2008-1155.; Georgiev, Georgi (2008) A genetic model of the Elatsite porphyry copper deposit, Bulgaria. GEOCHEMISTRY, MINERALOGY AND PETROLOGY • SOFIA 46, 143-160.
Canada
 
  • Nunavut
    • Kivalliq Region
      • Baker Lake
Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
  • Ontario
    • Cochrane District
      • Timmins area
        • Kidd Township
ontariominerals.com; Econ Geol (1997) 92:468-484; Canadian Mineralogist (1984) 22 (2), 227-232; Canadian Mineralogist, 18, 353-360; Thorpe, R.I., Pringle, G.J. & Purr, A.G. (1976): Occurrence of selenide and sulphide minerals in bornite ore of the Kidd Creek massive sulphide deposit, Timmins, Ontario. Geol. Sun, Can. Pap. 76-lA,
  • Saskatchewan
    • Beaverlodge Lake area
Can Min 10:787-796
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Econ Geol (1997) 92:468-484; Canadian Mineralogist Vol. 10, pp.787-796 (1972)
Chile
 
  • Atacama Region
    • Chañaral Province
      • Salitrosa-Porvenir district
Atlas of Ore Minerals, Picot and Johan (1982)
China
 
  • Sichuan Province
    • Liangshan Autonomous Prefecture
      • Huili Co.
Zhi Li, Zhenjie Chen, and Fengge Wang (1973): Geology and Prospecting 10(2), 20-24; Zhang Suhua et al. (1997): Chinese Journal of Nonferrous Metals 7(2), 11-16; Dong Zhensheng et al. (1996). In: Tu Guangzhi, Ed.: Low Temperature Geochemistry, Science Press (Beijing), 32-42
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
http://rruff.info/doclib/hom/eucairite.pdf
Econ Geol (1997) 92:468-484
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
    • Plzeň Region
      • Planá u Mariánských Lázní (Plan)
Scharmová, M., Scharm, B.: Minerály selenu na uranovém ložisku Zadní Chodov. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 43-47.
  • Moravia (Mähren; Maehren)
    • South Moravia Region
      • Tišnov
Šouba, M.: Příspěvek k mineralizacu dislokací v okolí Tišnovské Nové Vsi. Časopis pro mineralogii a geologii, 1984, roč. 29, č. 2, s. 185-191.uraninite, coffinite
    • Vysočina Region
      • Žďár nad Sázavou
        • Rožná deposit
Vavřín, I.: Nové poznatky o selenidech Českého masívu. Bulletin Mineralogicko-petrografického oddělení Národního muzea v Praze, 1994, roč. 2, s. 82-89. ; Econ Geol (1997) 92:468-484
Kvaček, M.: Selenides from the deposits of Western Moravia, Czechoslovakia – Part II. Acta Universitatis Carolinae – Geologica, 1979, vol. 23, nos. 1-2, s. 15-38. ; Econ Geol (1997) 92:468-484
      • Žďár nad Sázavou District
        • Nové Město na Moravě
Kvaček, M.: Selenides from the deposits of Western Moravia, Czechoslovakia – Part II. Acta Universitatis Carolinae – Geologica, 1979, vol. 23, nos. 1-2, s. 15-38. ; Econ Geol (1997) 92:468-484
Kvaček, M.: Selenides from the deposits of Western Moravia, Czechoslovakia – Part II. Acta Universitatis Carolinae – Geologica, 1979, vol. 23, nos. 1-2, s. 15-38.
France
 
  • Auvergne-Rhône-Alpes
    • Puy-de-Dôme
      • Sauxillanges
        • Chaméane
Econ Geol (1997) 92:468-484
Germany
 
  • Lower Saxony
    • Harz
      • Lautenthal
Weiss: "Mineralfundstellen, Deutschland West", 1990
      • Lerbach
Weiss: "Mineralfundstellen, Deutschland West", 1990
      • St Andreasberg District
        • St Andreasberg
Wittern: "Mineralfundorte in Deutschland", 2001
  • Saxony-Anhalt
    • Harz
      • Gernrode
        • Rieder
Schaarschmidt, H. (2007): Weltweit einmalig: Clausthalit als freie Kristalle aus dem Harz. Lapis 32 (3), 41-42. (in German); Heider, J. & Siemroth, J. (2012): Die Selenidmineralisation im Grauwacke-Tagebau Rieder bei Gernrode, Harz. Aufschluss, 63, 213-223.
Wittern: "Mineralfundorte in Deutschland", 2001
  • Saxony
    • Erzgebirge
      • Schlema-Hartenstein District
FÖRSTER et al. (2003) Canadian Mineralogist 41, 1433-1444
Greenland
 
  • Kujalleq
    • Narsaq
      • Qaqortoq (Julianehåb)
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Econ Geol (1997) 92:468-484
Norway
 
  • Buskerud
    • Kongsberg
      • Kongsberg Silver Mining District
        • Underberget Mining Field
Pavel M. Kartashov analytical data (2005)
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Gogołów-Jordanów Massif
      • Sobótka
Galuskin E. & Szełęg E. 2003: The first finding of Ag-amalgamates in rodingites (Nasławice, Lower Silesia, Poland). Mineralogical Society of Poland - Special Papers, 22, 48-50
    • Kłodzko District
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Romania
 
  • Hunedoara Co.
    • Deva
www.minerals-of-the-carpathians,2009; Gheorghe C. POPESCU, Antonela NEACŞU, Mihaela CIOACĂ, D. FILIPESCU (2010): The selenium and Se-minerals in the Săcărâmb ore deposits – Metaliferi Mountains, Romania. Romanian Journal of Mineral Deposits, 84, 127-130.
Sweden (TL)
 
  • Östergötland
    • Valdemarsvik
[Zeitschrift für Kristallographie, volume 108, pp. 389(1957); Clark, 1993 - "Hey's Mineral Index"]; Sandström, F. (2007): Skrikerum. Litiofilen 24 (1), 22-38
UK
 
  • England
    • Devon
      • South Devon
        • Torquay
[Camm, 1995, 71 - "Gold in the Counties of Cornwall and Devon"]; C. J. Stanley, A. J. Criddle and D. Lloyd (1990) Precious and Base Metal Selenide Mineralization at Hope's Nose, Torquay, Devon. Mineralogical Magazine 54:485-493
USA
 
  • Colorado
    • Montrose Co.
      • Uravan District
        • Paradox Valley
Minerals of Colorado (1997) Eckels, E. B.
    • San Miguel Co.
      • Slick Rock District
Minerals of Colorado (1997) Eckels, E. B.; Shawe, D.R., (2011), Uranium-vanadium deposits of the Slick Rock district, Colorado: U.S. Geological Survey Professional Paper 576-F, 80 p., 20 plates.
  • Nevada
    • Clark Co.
      • Spring Mts
        • Goodsprings District
NBMG Spec. Pub. 31 Minerals of Nevada
    • Elko Co.
      • Gold Circle District (Midas District)
NBMG Spec. Pub. 31 Minerals of Nevada
    • Humboldt Co.
      • Sulphur District
        • Sulphur
NBMG Spec. Pub. 31 Minerals of Nevada
  • Utah
    • San Juan Co.
      • Paradox Valley
        • Paradox Valley District
UGMS Bull 117 Minerals and Mineral Localities of Utah
Uzbekistan
 
  • Navoiy Viloyati (Navoi)
    • Central Kyzylkum Region
      • Bel'tau Mts
Koneev, R.I., Turesebekov, A.H., Ignatikov, E.N., Vasilevsky, B.B., and Rakhimov, R.R. (2005), In: Jingwen Mao and Bierlein, F.P. (Eds.): Mineral Deposit Research: Meeting the Global Challenge, Vol. 1, 1403-1406
Mineral and/or Locality  
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