Mineralogy Database

Eucairite Mineral Data

Search Webmineral :

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

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  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

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  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
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%

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)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.06)Stromeyerite Group Stromeyerite AgCuS C mcm 2/m 2/m 2/m 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

Search for Eucairite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Eucairite :

Ask about Eucairite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Eucairite Specimen Label here :


Dana No: Strunz No: 02.BA.25d





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.