Mineralogy Database

Eucairite Mineral Data

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General Eucairite Information

Help on Chemical  Formula: Chemical Formula: CuAgSe
Help on Composition: Composition: Molecular Weight = 250.37 gm
   Copper    25.38 %  Cu
   Silver    43.08 %  Ag
   Selenium  31.54 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: CuAgSe
Help on Environment: Environment: Widely distributed in selenium deposits of hydrothermal origin; locally abundant with other selenides.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1818
Help on Locality: Locality: In Canada, in the Martin Lake mine near Lake Athabasca, Saskatchewan, and in the Kidd Creek mine, near Timmins, Ontario. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "opportunity," because it was discovered shortly after discovery of the element selenium.
Help on Name Pronunciation: Name Pronunciation: Eucairite + Pronunciation Say EUCAIRITE
 

Eucairite Image

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  Eucairite

Comments: Black dendritic eucairite in white calcite crystal.
Location: Skrikerum Copper Mine, near Tyrsarum, Kalmar, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Schlemaite   Clausthalite   Eucairite

Comments: Reflected-light digital-image of the intermixed schlemaite grain in type sample F2, from which the reflectance, crystallographic and crystal-structure data were obtained. (CanMin, v 41, p 1435).
Location: "Tiber" dike, -855-m level, block 5128, main shaft # 371, Niederschlema-Alberoda vein-type uranium depost at Hartensein, Erzgebirge, Germany. Scale: See Picture.
© Canadian Mineralogist

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  Crookesite   Eucairite

Comments: Polished section (PPL) showing zoned crystal of cream-colored eucairite and pale lavender crookesite along with steel blue umangite and white clausthalite in dark gray gangue..
Location: Mine dump (tailings) of Shaft 371 near Hartenstein/Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Schlothauer

Eucairite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0085:1:1.5503
Help on Cell Dimensions: Cell Dimensions: a = 4.105, b = 4.07, c = 6.31, Z = 2; V = 105.42 Den(Calc)= 7.89
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.494(1), 2.628(0.59), 2.89(0.5),
 

Physical Properties of Eucairite

Help on Cleavage: Cleavage: None
Help on Color: Color: Bronze, Bronze, Gray, Silver white, Tin white.
Help on Density: Density: 7.6 - 7.8, Average = 7.69
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Subconchoidal - Brittle frature with subconchoidal fragments
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: gray white
 

Optical Properties of Eucairite

Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Color: RL Color: Tin-white with a faint creamy tinge.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Eucairite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   34.70   35.00 
   
 420 nm   34.80   35.10 
 440 nm   34.90   35.20 
 460 nm   35.30   35.50 
 480 nm   36.20   35.80 
 500 nm   37.00   36.40 
 520 nm   37.20   36.90 
 540 nm   37.10   37.20 
 560 nm   36.80   37.30 
 580 nm   36.30   37.00 
 600 nm   35.60   36.50 
 620 nm   35.00   35.70 
 640 nm   34.40   35.00 
 660 nm   33.80   34.40 
 680 nm   33.30   34.00 
 700 nm   32.90   33.80 
Calculated Relative Intensity Colors of Eucairite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%
R1                      
R2                      
 

Calculated Properties of Eucairite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.93 gm/cc
note: Specific Gravity of Eucairite =7.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEEucairite = 149.06 barns/electron
U=PEEucairite x rElectron Density=1,033.38 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eucairite is Not Radioactive
 

Eucairite Classification

Help on  Dana Class: Dana Class: 02.04.06.02 (02)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.06)Stromeyerite Group
 
02.04.06.01 Stromeyerite AgCuS C mcm 2/m 2/m 2/m
 
02.04.06.02 Eucairite CuAgSe Pmmn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.BA.25d 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BA -With Cu, Ag, Au
 
02.BA.25d Eucairite CuAgSe Pmmn 2/m 2/m 2/m
 

Other Eucairite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Eucairite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Eucairite

CuAgSe
Dana No: 02.04.06.02 Strunz No: 02.BA.25d
Locality:

 

Notes:

 

 
   
 


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