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Eskebornite Mineral Data
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General Eskebornite Information
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 Chemical Formula: |
CuFeSe2 |
| Composition: |
Molecular Weight = 277.31 gm |
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Iron 20.14 % Fe |
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Copper 22.91 % Cu |
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Selenium 56.95 % Se |
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______ |
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100.00 % |
| Empirical Formula: |
CuFe2+Se2 |
| Environment: |
In low-temperature hydrothermal vein deposits. |
| IMA Status: |
Valid Species (Pre-IMA) 1949 |
| Locality: |
From Eskeborn adit, Tilkerode, Harz Mountains, Germany. Link to MinDat.org Location Data. |
| Name Origin: |
For the Eskeborn adit, Tilkerode, Germany, where first discovered. |
| Name Pronunciation: |
Eskebornite + Pronunciation  |
| Synonym: |
ICSD 73376 |
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PDF 41-1464 |
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Eskebornite Image |
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Images:
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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 |
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Eskebornite Crystallography
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| Axial Ratios: |
a:c = 1:2.00217 |
| Cell Dimensions: |
a = 5.518, c = 11.048, Z = 2; V = 336.39 Den(Calc)= 2.74 |
| Crystal System: |
Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42d |
| X Ray Diffraction: |
By Intensity(I/Io): 1.96(1), 3.19(0.95), 1.671(0.8), |
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Physical Properties of Eskebornite
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| Cleavage: |
{001} Perfect |
| Color: |
Bronze. |
| Density: |
5.35 |
| Diaphaneity: |
Opaque |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Habit: |
Pseudo Cubic - Crystals show a cubic outline. |
| Hardness: |
3-3.5 - Calcite-Copper Penny |
| Luster: |
Metallic |
| Magnetism: |
Distinctly magnetic |
| Streak: |
black |
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Optical Properties of Eskebornite
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| RL Anisotrophism: |
Marked, yellowish to tan. |
| RL Color: |
Brown-yellow or cream-yellow, sometimes with an orange tint. |
| RL Pleochroism: |
Creamy yellow to yellowish brown. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Eskebornite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
23.50 |
28.00 |
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| 420 nm |
24.50 |
29.00 |
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| 440 nm |
25.50 |
30.00 |
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| 460 nm |
26.40 |
31.10 |
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| 480 nm |
27.20 |
32.20 |
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| 500 nm |
28.00 |
33.40 |
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| 520 nm |
28.70 |
34.40 |
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| 540 nm |
29.40 |
35.00 |
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| 560 nm |
30.00 |
35.30 |
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| 580 nm |
30.60 |
35.50 |
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| 600 nm |
31.00 |
35.80 |
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| 620 nm |
31.50 |
36.00 |
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| 640 nm |
31.90 |
36.40 |
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| 660 nm |
32.20 |
37.00 |
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| 680 nm |
32.60 |
37.70 |
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| 700 nm |
33.00 |
38.70 |
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Calculated Relative Intensity Colors of Eskebornite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
340% |
| R1 |
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| R2 |
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Calculated Properties of Eskebornite
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| Electron Density: |
Bulk Density (Electron Density)=2.43 gm/cc
note: Specific Gravity of Eskebornite =2.74 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PEEskebornite = 62.47 barns/electron
U=PEEskebornite x rElectron Density= 151.84 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eskebornite is Not Radioactive |
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Eskebornite Classification
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| Dana Class: |
02.09.01.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.09)where Am Bn Xp, with (m+n):p=1:1 |
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(02.09.01)Chalcopyrite Group (Tetragonal: I-42d) |
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02.09.01.01 Chalcopyrite CuFeS2 I 42d 4 2m |
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02.09.01.02 Eskebornite CuFeSe2 I 42d 4 2m |
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02.09.01.03 Gallite CuGaS2 I 42d 4 2m |
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02.09.01.04 Roquesite CuInS2 I 42d 4 2m |
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02.09.01.05 Lenaite AgFeS2 P 42mc 4mm |
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02.09.01.06 Laforetite! AgInS2 I 42d 4 2m |
| Strunz Class: |
02.CB.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CB -With Zn, Fe, Cu, Ag, Au, etc |
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02.CB.10a Chalcopyrite CuFeS2 I 42d 4 2m |
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02.CB.10a Eskebornite CuFeSe2 I 42d 4 2m |
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02.CB.10a Gallite CuGaS2 I 42d 4 2m |
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02.CB.10a Laforetite! AgInS2 I 42d 4 2m |
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02.CB.10a Lenaite AgFeS2 P 42mc 4mm |
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02.CB.10a Roquesite CuInS2 I 42d 4 2m |
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Other Eskebornite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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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Eskebornite
CuFeSe2
Dana No: 02.09.01.02 Strunz No: 02.CB.10a
Locality:
Notes:
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