Mineralogy Database

Eskebornite Mineral Data

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General Eskebornite Information

Help on Chemical  Formula: Chemical Formula: CuFeSe2
Help on Composition: Composition: Molecular Weight = 277.31 gm
   Iron      20.14 %  Fe
   Copper    22.91 %  Cu
   Selenium  56.95 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: CuFe2+Se2
Help on Environment: Environment: In low-temperature hydrothermal vein deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1949
Help on Locality: Locality: From Eskeborn adit, Tilkerode, Harz Mountains, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Eskeborn adit, Tilkerode, Germany, where first discovered.
Help on Name Pronunciation: Name Pronunciation: Eskebornite + Pronunciation Say ESKEBORNITE
Help on Synonym: Synonym: ICSD 73376
  PDF 41-1464
 

Eskebornite Image

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

  Jolliffeite   Eskebornite

Comments: Back-scattered electron image of jolliffeite in sulfurian eskebornite. Note the cracked appearance and the different brightness of eskebornite, which is a reflection of variable ratio of selenium to sulfur. (CanMin v 42, p 844).
Location: Niederschlema-Alberoda uranium deposit, in the Erzgebirge region of Germany. Scale: See Image.
© Canadian Mineralogist

Eskebornite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.00217
Help on Cell Dimensions: Cell Dimensions: a = 5.518, c = 11.048, Z = 2; V = 336.39 Den(Calc)= 2.74
Help on Crystal System: Crystal System: Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.96(1), 3.19(0.95), 1.671(0.8),
 

Physical Properties of Eskebornite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Bronze.
Help on Density: Density: 5.35
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Distinctly magnetic
Help on Streak: Streak: black
 

Optical Properties of Eskebornite

Help on RL Anisotrophism: RL Anisotrophism: Marked, yellowish to tan.
Help on RL Color: RL Color: Brown-yellow or cream-yellow, sometimes with an orange tint.
Help on RL Pleochroism: RL Pleochroism: Creamy yellow to yellowish brown.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Eskebornite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   23.50   28.00 
   
 420 nm   24.50   29.00 
 440 nm   25.50   30.00 
 460 nm   26.40   31.10 
 480 nm   27.20   32.20 
 500 nm   28.00   33.40 
 520 nm   28.70   34.40 
 540 nm   29.40   35.00 
 560 nm   30.00   35.30 
 580 nm   30.60   35.50 
 600 nm   31.00   35.80 
 620 nm   31.50   36.00 
 640 nm   31.90   36.40 
 660 nm   32.20   37.00 
 680 nm   32.60   37.70 
 700 nm   33.00   38.70 
Calculated Relative Intensity Colors of Eskebornite in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 340%
R1                      
R2                      
 

Calculated Properties of Eskebornite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.43 gm/cc
note: Specific Gravity of Eskebornite =2.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEEskebornite = 62.47 barns/electron
U=PEEskebornite x rElectron Density= 151.84 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eskebornite is Not Radioactive
 

Eskebornite Classification

Help on  Dana Class: Dana Class: 02.09.01.02 (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.01)Chalcopyrite Group (Tetragonal: I-42d)
 
02.09.01.01 Chalcopyrite CuFeS2 I 42d 4 2m
 
02.09.01.02 Eskebornite CuFeSe2 I 42d 4 2m
 
02.09.01.03 Gallite CuGaS2 I 42d 4 2m
 
02.09.01.04 Roquesite CuInS2 I 42d 4 2m
 
02.09.01.05 Lenaite AgFeS2 P 42mc 4mm
 
02.09.01.06 Laforetite! AgInS2 I 42d 4 2m
Help on  Strunz Class: Strunz Class: 02.CB.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CB -With Zn, Fe, Cu, Ag, Au, etc
 
02.CB.10a Chalcopyrite CuFeS2 I 42d 4 2m
 
02.CB.10a Eskebornite CuFeSe2 I 42d 4 2m
 
02.CB.10a Gallite CuGaS2 I 42d 4 2m
 
02.CB.10a Laforetite! AgInS2 I 42d 4 2m
 
02.CB.10a Lenaite AgFeS2 P 42mc 4mm
 
02.CB.10a Roquesite CuInS2 I 42d 4 2m
 

Other Eskebornite 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 Eskebornite :
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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Print or Cut-and-Paste your Eskebornite Specimen Label here :

Eskebornite

CuFeSe2
Dana No: 02.09.01.02 Strunz No: 02.CB.10a
Locality:

 

Notes:

 

 
   
 


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