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Eucairite

A valid IMA mineral species - grandfathered
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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.


Unique IdentifiersHide

Mindat ID:
1415
Long-form identifier:
mindat:1:1:1415:7
GUID
(UUID V4):
15280ebf-2c89-4100-bc90-372e044f76f7

IMA Classification of EucairiteHide

Classification of EucairiteHide

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

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
EcaIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
EucThe 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 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

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 EucairiteHide

Mindat Formula:
AgCuSe

Crystallography of EucairiteHide

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 ų (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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0010578EucairiteFrueh A J, Czamanske G K, Knight C (1957) The crystallography of eucairite, CuAgSe Zeitschrift fur Kristallographie 108 389-3961957Skrikerum, Sweden0293
0010579EucairiteFrueh A J, Czamanske G K, Knight C (1957) The crystallography of eucairite, CuAgSe Zeitschrift fur Kristallographie 108 389-3961957Skrikerum, Sweden0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.12 Å(10)
2.61 Å(7)
2.88 Å(5)
2.48 Å(4)
2.02 Å(2)
3.14 Å(1)
1.861 Å(1)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])
Geological Setting:
Hydrothermal deposits

Type Occurrence of EucairiteHide

Reference:
Berzelius J (1818) III. Undersökning af några föreningar, som bero af svagare frändskaper 12. Undersökning om fórekommandet af selenium i mineralriket. Afhandlingar i Fysik, Kemi och Mineralogi 6, 134-144

Synonyms of EucairiteHide

Other Language Names for EucairiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
39 photos of Eucairite associated with ClausthalitePbSe
31 photos of Eucairite associated with BerzelianiteCu2-xSe (x ≈ 0.12)
21 photos of Eucairite associated with UmangiteCu3Se2
19 photos of Eucairite associated with CalciteCaCO3
12 photos of Eucairite associated with TiemanniteHgSe
9 photos of Eucairite associated with Hakite-(Hg)Cu6(Cu4Hg2)Sb4Se12Se
7 photos of Eucairite associated with KlockmanniteCuSe
7 photos of Eucairite associated with UraniniteUO2
4 photos of Eucairite associated with CoffiniteU(SiO4) · nH2O
4 photos of Eucairite associated with PitchblendeUO2

Related Minerals - Strunz-mindat GroupingHide

2.BA.Orileyite(Fe,Cu)2As
2.BA.AlburniteAg8GeTe2S4Iso.
2.BA.DzierżanowskiteCaCu2S2Trig. 3m (3 2/m) : P3m1
2.BA.MakotoiteAg12(Cu3Au)S8Trig. 3m (3 2/m) : R3c
2.BA.XuwenyuaniteAg9Fe3+Te2S4Iso. 4 3m : F4 3m
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.20BerzelianiteCu2-xSe (x ≈ 0.12)Iso. m3m (4/m 3 2/m) : Fm3m
2.BA.25AthabascaiteCu5Se4Orth.
2.BA.25UmangiteCu3Se2Tet. 4 2m : P4 21m
2.BA.30RickarditeCu7Te5Orth. mmm (2/m 2/m 2/m) : Pmmn
2.BA.30WeissiteCu2-xTeHex. 6/mmm (6/m 2/m 2/m) : P6/mmm
2.BA.35AcanthiteAg2SMon. 2/m : P21/m
2.BA.35SpryiteAg8(As3+0.5As5+0.5)S6Orth. mm2 : Pna21
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.42HoneaiteAu3TlTe2 Orth. mmm (2/m 2/m 2/m) : Pbcm
2.BA.45JalpaiteAg3CuS2Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
2.BA.45KuriliteAg8Te3SeTrig. 3 : R3
2.BA.45SelenojalpaiteAg3CuSe2Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
2.BA.47Spiridonovite(Cu1-xAgx)2TeTrig. 3m (3 2/m) : P3c1
2.BA.50WuyanzhiiteCu2STet. 4 2 2 : P43 21 2
2.BA.52ArgentiteAg2SIso.
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. 6 2 2 : P63 2 2
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.

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.

Internet Links for EucairiteHide

References for EucairiteHide

Reference List:

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 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.
Argentina
 
  • La Rioja Province
    • Capital Department
      • Puerto Alegre
    • Chilecito department
      • Sañogasta
    • General Lamadrid department
      • Villa Castelli
    • Vinchina Department
      • Jagüé
  • Mendoza Province
    • Luján de Cuyo department
      • Cacheuta District
          • Cerro de Cacheuta
Australia
 
  • Queensland
    • Cook Shire
  • South Australia
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
  • Western Australia
    • Kalgoorlie-Boulder Shire
      • Kalgoorlie-Boulder
        • Kalgoorlie Consolidated Gold Mines
Bulgaria
 
  • Sofia Province
    • Chelopech Municipality
    • Etropole Municipality
Canada
 
  • Nunavut
    • Kivalliq Region
      • Baker Lake
  • Ontario
    • Cochrane District
      • Timmins
        • Kidd Township
  • Saskatchewan
    • Beaverlodge Lake area
Chile
 
  • Atacama
    • Chañaral Province
      • Salitrosa-Porvenir mining district
China
 
  • Sichuan
    • Liangshan Yi
      • Huili County
Czech Republic
 
  • Central Bohemian Region
  • Karlovy Vary Region
    • Karlovy Vary District
  • Olomouc Region
    • Jeseník District
      • Javorník
        • Zálesí
  • Plzeň Region
    • Klatovy District
      • Nalžovské Hory
        • Ústaleč
    • Tachov District
      • Zadní Chodov
  • South Bohemian Region
    • Písek District
      • Kovářov
        • Předbořice
  • South Moravian Region
    • Brno-Country District
  • Vysočina Region
    • Žďár nad Sázavou District
      • Nové Město na Moravě
      • Rožná
        • Rožná deposit
France
 
  • Auvergne-Rhône-Alpes
    • Puy-de-Dôme
      • Issoire
        • Le Vernet-Chaméane
Germany
 
  • Brandenburg
    • Spree-Neiße
      • Spremberg
  • Hesse
    • Darmstadt
      • Darmstadt-Dieburg
        • Mühltal
          • Nieder-Ramstadt
  • Lower Saxony
    • Goslar District
      • Braunlage
        • St Andreasberg
      • Harz (Landkreis Goslar)
    • Göttingen District
      • Harz (Landkreis Göttingen)
  • Saxony-Anhalt
    • Harz
      • Ballenstedt
        • Rieder
    • Mansfeld-Südharz
      • Mansfeld
  • Saxony
    • Erzgebirgskreis
      • Aue-Bad Schlema
    • Zwickau District
      • Hartenstein
Greenland
 
  • Kujalleq
    • Qaqortoq
Middle East
 
Norway
 
  • Viken
    • Kongsberg
      • Underberget Mining Field
Poland
 
  • Lower Silesian Voivodeship
    • Kłodzko County
      • Gmina Stronie Śląskie
    • Wrocław County
      • Gmina Sobótka
        • Nasławice
Romania
 
  • Hunedoara County
    • Certeju de Sus
Sweden (TL)
 
  • Östergötland County
    • Valdemarsvik
UK
 
  • England
    • Devon
      • Torbay
        • Torquay
USA
 
  • Colorado
    • Montrose County
      • Uravan Mining District
        • Paradox Valley
    • San Miguel County
      • Slick Rock Mining District
  • Nevada
    • Clark County
      • Spring Mountains
        • Goodsprings Mining District
    • Elko County
      • Gold Circle Mining District (Midas Mining District)
    • Humboldt County
      • Sulphur Mining District
        • Sulphur
  • Utah
    • San Juan County
      • La Sal Creek Mining District
Uzbekistan
 
  • Navoiy
    • Central Kyzylkum Region
      • Bel'tau Mountains
 
Mineral and/or Locality  
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