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. |
Synonym: |
ICSD 73376 |
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PDF 41-1464 |
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Eskebornite Image |
Images:
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Eskebornite Jolliffeite
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 - ScalenohedralH-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 |
Diaphaniety: |
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: |
relectron=2.43 gm/cc note: rEskebornite =2.74 gm/cc. |
Fermion Index |
Fermion Index = 0.04754 Boson Index = 0.95246 |
Photoelectric: |
PEEskebornite = 62.47 barns/electron U=PEEskebornite x relectron= 151.84 barns/cc. |
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: |
2.9.1.2 (2)Sulfides - Including Selenides and Tellurides |
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(2.9)where Am Bn Xp, with (m+n):p=1:1 |
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(2.9.1)Chalcopyrite Group (Tetragonal: I4¯2d) |
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2.9.1.1 Chalcopyrite CuFeS2 I 42d 4 2m |
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2.9.1.2 Eskebornite CuFeSe2 I 42d 4 2m |
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2.9.1.3 Gallite CuGaS2 I 42d 4 2m |
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2.9.1.4 Roquesite CuInS2 I 42d 4 2m |
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2.9.1.5 Lenaite AgFeS2 I 42d 4 2m |
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2.9.1.6 Laforetite! AgInS2 I 42d 4 2m |
Strunz Class: |
II/C.03-20 II - Sulfides and sulphosalts |
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II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1 |
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II/C.03 - Chalcopyrite group and related compounds |
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II/C.03-10 Chalcopyrite CuFeS2 I 42d 4 2m |
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II/C.03-20 Eskebornite CuFeSe2 I 42d 4 2m |
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II/C.03-25 Lenaite AgFeS2 I 42d 4 2m |
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II/C.03-30 Gallite CuGaS2 I 42d 4 2m |
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II/C.03-40 Roquesite CuInS2 I 42d 4 2m |
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II/C.03-50 Laforetite! AgInS2 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 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (UofA)
7 -MinDAT
8 -MinMax(Deutsch)
9 -MinMax(English)
10 -Mineralienatlas (Deutsch)
11 -QUT Mineral Atlas
12 - WWW-MINCRYST
13 -École des Mines de Paris
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Print or Cut-and-Paste your Eskebornite Specimen Label here :
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Eskebornite
CuFeSe2
Dana No: 2.9.1.2 Strunz No: II/C.03-20
Locality:
Notes:
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