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Eucairite

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About EucairiteHide

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.


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:
18 photos of Eucairite associated with BerzelianiteCu2Se
18 photos of Eucairite associated with ClausthalitePbSe
7 photos of Eucairite associated with UmangiteCu3Se2
6 photos of Eucairite associated with Hakite-(Hg)Cu6Cu4Hg2Sb4Se12Se
5 photos of Eucairite associated with CalciteCaCO3
4 photos of Eucairite associated with CoffiniteU(SiO4) · nH2O
4 photos of Eucairite associated with PitchblendeUO2
4 photos of Eucairite associated with UraniniteUO2
4 photos of Eucairite associated with TiemanniteHgSe
3 photos of Eucairite associated with SabatieriteCu6TlSe4

Related Minerals - Nickel-Strunz GroupingHide

2.BA.AlburniteAg8GeTe2S4Iso.
2.BA.DzierżanowskiteCaCu2S2Trig. 3m (3 2/m) : P3m1
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. 6 : P6
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.75PetrovskaiteAuAgSMon.
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. 6 : P6
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 Province
    • 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 mining 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; de Brodtkorb, M. K.; Gay, H. D.; Sureda, R. J. (1993): Polymetallic selenide-sulfide minerals of the Los Llantenes mining district, La Rioja, Argentina. Maurice, Yvon T. (Ed.), Proc. 8th Quadrenn. IAGOD Symp., 119-125.
  • Mendoza Province
    • Luján de Cuyo department
      • Cacheuta
Econ Geol (1997) 92:468-484; Grundmann, G., & Förster, H. J. (2018). The Sierra de Cacheuta Vein-Type Se Mineralization, Mendoza Province, Argentina. Minerals, 8(4), 127.
          • 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
 
  • Sofia City Province
    • Chelopech
American Mineralogist (1966): 51: 29-36; Cook, N. J., Ciobanu, C. L., & Bogdanov, K. (2002) Trace mineralogy of the Upper Cretaceous banatitic Magmatic and metallogenetic Belt, SE Europe. In 11th Quadrennial IAGOD symposium–Geocongress 2002, Windhoek, Namibia, July 2002. CD Volume of extended abstracts.
  • Sofia Province
    • 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
    • Chañaral Province
      • Salitrosa-Porvenir district
Atlas of Ore Minerals, Picot and Johan (1982)
China
 
  • Sichuan
    • Liangshan
      • 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
 
  • Central Bohemian Region
    • Kutná Hora District
      • Předbořice
Econ Geol (1997) 92:468-484; Bindi, L., Förster, H. J., Grundmann, G., Keutsch, F., & Stanley, C. (2016). Petříčekite, CuSe2, a New Member of the Marcasite Group from the Předbořice Deposit, Central Bohemia Region, Czech Republic. Minerals, 6(2), 33.
Škácha, P., Sejkora, J., & Plášil, J. (2017). Selenide mineralization in the Příbram uranium and base-metal district (Czech Republic). Minerals, 7(6), 91.
    • Rakovník District
http://rruff.info/doclib/hom/eucairite.pdf
  • Karlovy Vary Region
    • Karlovy Vary District
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
  • Plzeň Region
    • Tachov District
      • Planá u Mariánských Lázní
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.
  • South Moravian Region
    • Brno-Country District
      • 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 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.
      • Rožná
        • 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
Denmark
 
  • Greenland
    • Kujalleq
      • Narsaq
        • Qaqortoq
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Econ Geol (1997) 92:468-484
France
 
  • Auvergne-Rhône-Alpes
    • Puy-de-Dôme
      • Sauxillanges
        • Chaméane
Econ Geol (1997) 92:468-484
Germany
 
  • Brandenburg
Kopp, J. C., Spieth, V., & Bernhardt, H. J. (2012). Precious metals and selenides mineralisation in the copper-silver deposit Spremberg-Graustein, Niederlausitz, SE-Germany [Edelmetall-und Selenerze in der Kupfer-Silber-Lagerstätte Spremberg-Graustein, Niederlausitz, SE-Deutschland]. Zeitschrift der deutschen Gesellschaft für Geowissenschaften, 163(4), 361-384.
  • Lower Saxony
    • Goslar
      • Braunlage
        • St Andreasberg
Wittern: "Mineralfundorte in Deutschland", 2001
      • Langelsheim
        • Lautenthal
Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Göttingen
      • Osterode am Harz
        • Lerbach
Weiss: "Mineralfundstellen, Deutschland West", 1990
  • 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
    • Erzgebirgskreis
      • Schlema-Hartenstein District
Förster, H. J. (2004). Mineralogy of the Niederschlema-Alberoda U–Se-polymetallic deposit, Erzgebirge, Germany. II: Hessite, Ag2Te, and native Te (?), the first tellurium minerals. Neues Jahrbuch für Mineralogie-Abhandlungen: Journal of Mineralogy and Geochemistry, 180(2), 101-113.
FÖRSTER et al. (2003) Canadian Mineralogist 41, 1433-1444
Israel
 
  • Negev
Vapnik, Y., Galuskina, I., Murashko, M., Britvin, S., & Galuskin, E. (2014). The Hatrurim Complex-the New Unique Locality on World Mineral Map: the Review of Mineral Discoveries. In Israel Geological Society 2014, Annual Meeting, En Boqeq (pp. 143-144).
Norway
 
  • Buskerud
    • Kongsberg
      • Kongsberg silver mining district
        • Underberget Mining Field
Pavel M. Kartashov analytical data (2005)
Poland
 
  • Lower Silesian Voivodeship
    • Kłodzko Co.
      • Gmina Stronie Śląskie
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
    • Wrocław Co.
      • Gmina 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
Romania
 
  • Hunedoara
    • 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 County
    • 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
      • Torbay
        • 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 Mining District
        • Paradox Valley
Minerals of Colorado (1997) Eckel, E. B.
    • San Miguel Co.
      • Slick Rock Mining District
Minerals of Colorado (1997) Eckel, 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 Mining District
NBMG Spec. Pub. 31 Minerals of Nevada
    • Elko Co.
      • Gold Circle Mining District (Midas Mining District)
NBMG Spec. Pub. 31 Minerals of Nevada
    • Humboldt Co.
      • Sulphur Mining District
        • Sulphur
NBMG Spec. Pub. 31 Minerals of Nevada
  • Utah
    • San Juan Co.
      • Paradox Valley
        • Paradox Valley Mining District
UGMS Bull 117 Minerals and Mineral Localities of Utah
Uzbekistan
 
  • Navoiy
    • 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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