Eskebornite
A valid IMA mineral species - grandfathered
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About Eskebornite
Formula:
CuFeSe2
Colour:
Brass yellow
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
5.35
Crystal System:
Tetragonal
Member of:
Name:
Named for the Eskeborn adit, Tilkerode, Germany, the type locality.
Unique Identifiers
Mindat ID:
1409
Long-form identifier:
mindat:1:1:1409:6
GUID
(UUID V4):
(UUID V4):
858146e6-2227-48ca-81d7-75f520f27045
IMA Classification of Eskebornite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1950
Type description reference:
Classification of Eskebornite
2.CB.10a
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
2.9.1.2
2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
3.1.33
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. of Cu
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. of Cu
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ebn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Eskebornite
Metallic
Transparency:
Opaque
Colour:
Brass yellow
Comment:
Tarnishes dark brown to black
Streak:
Black
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN15=155 - 252 kg/mm2 - Vickers
Cleavage:
Perfect
on {001}
on {001}
Density:
5.35 g/cm3 (Measured) 5.44 g/cm3 (Calculated)
Optical Data of Eskebornite
Anisotropism:
Marked - yellowish to tan
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
400nm | 22.0% | 24.5% |
440nm | 26.5% | 30.1% |
480nm | 28.7% | 33.1% |
520nm | 30.4% | 35.0% |
560nm | 31.6% | 36.0% |
600nm | 32.6% | 36.4% |
640nm | 33.3% | 37.0% |
680nm | 33.8% | 38.1% |
700nm | 34.0% | 38.7% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 38.7%.
R1 shown in black, R2 shown in red
Colour in reflected light:
brown-yellow or cream-yellow sometimes with orange tint
Pleochroism:
Weak
Comments:
Creamy yellow to yellowish brown
Chemistry of Eskebornite
Mindat Formula:
CuFeSe2
Elements listed:
Crystallography of Eskebornite
Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
P4 2c
Cell Parameters:
a = 5.518(4) Å, c = 11.048(6) Å
Ratio:
a:c = 1 : 2.002
Unit Cell V:
336.39 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Thick tabular crystals to 1mm
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014365 | Eskebornite | Delgado J M, Diaz de Delgado G, Quintero M, Woolley J C (1992) The crystal structure of copper iron selenide, CuFeSe2 Materials Research Bulletin 27 367-373 | 1992 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.186 Å | (100) |
1.951 Å | (90) |
1.664 Å | (80) |
5.52 Å | (70) |
1.127 Å | (70) |
1.380 Å | (60) |
2.470 Å | (50) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Geological Setting:
Low temperature hydrothermal deposits
Type Occurrence of Eskebornite
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1948,325; Harvard University, Cambridge, Massachusetts, USA, 98902.
Geological Setting of Type Material:
low-temperature hydrothermal vein deposits
Associated Minerals at Type Locality:
Reference:
Ramdohr, P. (1950) Neue erzmineralien. Fortschritte der Mineralogie: 28: 69-70.
Other Language Names for Eskebornite
German:Eskebornit
Russian:Эскеборнит
Simplified Chinese:硒黄铜矿
Spanish:Eskebornita
Traditional Chinese:硒黃銅礦
Relationship of Eskebornite to other Species
Member of:
Other Members of this group:
Chalcopyrite | CuFeS2 | Tet. 4 2m : I4 2d |
Gallite | CuGaS2 | Tet. 4 2m : I4 2d |
Laforêtite | AgInS2 | Tet. 4 2m : I4 2d |
Lenaite | AgFeS2 | Tet. 4 2m : I4 2d |
Roquesite | CuInS2 | Tet. 4 2m : I4 2d |
Shenzhuangite | NiFeS2 | Tet. 4 2m : I4 2d |
Unnamed (Cu-Mn-Sn Sulpide) | Cu2MnSnS4 |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
18 photos of Eskebornite associated with Clausthalite | PbSe |
12 photos of Eskebornite associated with Klockmannite | CuSe |
5 photos of Eskebornite associated with Krut'aite | CuSe2 |
4 photos of Eskebornite associated with Berzelianite | Cu2-xSe (x ≈ 0.12) |
4 photos of Eskebornite associated with Petrovicite | Cu3HgPbBiSe5 |
4 photos of Eskebornite associated with Umangite | Cu3Se2 |
4 photos of Eskebornite associated with Calcite | CaCO3 |
4 photos of Eskebornite associated with Quijarroite | Cu6HgPb2Bi4Se12 |
3 photos of Eskebornite associated with Geffroyite | (Cu,Fe,Ag)9(Se,S)8 |
3 photos of Eskebornite associated with Chalcopyrite | CuFeS2 |
Related Minerals - Strunz-mindat Grouping
2.CB. | Agmantinite | Ag2MnSnS4 |
2.CB. | Richardsite | Zn2CuGaS4 |
2.CB. | Gachingite | Au(Te1-xSex) |
2.CB. | Tolstykhite | Au3S4Te6 |
2.CB. | Hanswilkeite | KFeS2 |
2.CB. | Auroselenide | AuSe |
2.CB. | Ruizhongite | (Ag2◻)Pb3Ge2S8 |
2.CB. | Okruginite | Cu2SnSe3 |
2.CB.05a | Coloradoite | HgTe |
2.CB.05a | Hawleyite | CdS |
2.CB.05a | Metacinnabar | HgS |
2.CB.05c | Polhemusite | (Zn,Hg)S |
2.CB.05b | Sakuraiite | (Cu,Zn,Fe)3(In,Sn)S4 |
2.CB.05a | Sphalerite | ZnS |
2.CB.05a | Stilleite | ZnSe |
2.CB.05a | Tiemannite | HgSe |
2.CB.05 | UM1998-15-S:CuFeZn | Cu2Fe3Zn5S10 |
2.CB.05a | Rudashevskyite | (Fe,Zn)S |
2.CB.05a | Ishiharaite | (Cu,Ga,Fe,In,Zn)S |
2.CB.07a | Shenzhuangite | NiFeS2 |
2.CB.07a | Unnamed (Cu-Mn-Sn Sulpide) | Cu2MnSnS4 |
2.CB.10a | Chalcopyrite | CuFeS2 |
2.CB.10a | Gallite | CuGaS2 |
2.CB.10b | Haycockite | Cu4Fe5S8 |
2.CB.10a | Lenaite | AgFeS2 |
2.CB.10b | Mooihoekite | Cu9Fe9S16 |
2.CB.10b | Putoranite | Cu1.1Fe1.2S2 |
2.CB.10a | Roquesite | CuInS2 |
2.CB.10b | Talnakhite | Cu9(Fe,Ni)8S16 |
2.CB.10a | Laforêtite | AgInS2 |
2.CB.10a | Unnamed (Cu-Zn-In Sulphide) | CuZn2InS4 |
2.CB.10a | UM1984-30-S:CuFeSn | Cu2Fe2Sn3S7 |
2.CB.10c | Omariniite | Cu8Fe2ZnGe2S12 |
2.CB.15a | Černýite | Cu2(Cd,Zn,Fe)SnS4 |
2.CB.15a | Ferrokësterite | Cu2FeSnS4 |
2.CB.15a | Hocartite | Ag2(Fe2+,Zn)SnS4 |
2.CB.15a | Idaite | Cu5FeS6 |
2.CB.15a | Kësterite | Cu2ZnSnS4 |
2.CB.15a | Kuramite | Cu3SnS4 |
2.CB.15b | Mohite | Cu2SnS3 |
2.CB.15a | Pirquitasite | Ag2ZnSnS4 |
2.CB.15a | Stannite | Cu2FeSnS4 |
2.CB.15c | Stannoidite | Cu+6Cu2+2(Fe2+,Zn)3Sn2S12 |
2.CB.15a | Velikite | Cu2HgSnS4 |
2.CB.15c | UM2006-11-S:CuFeGeZn | Cu8(Fe,Zn)3Ge2S12 (?) |
2.CB.17a v | Arsenic-bearing Renierite | Cu11GeAsFe4S16 |
2.CB.20 | Chatkalite | Cu6FeSn2S8 |
2.CB.20 | Mawsonite | Cu6Fe2SnS8 |
2.CB.30 | Argyropyrite | near Ag2Fe7S11 |
2.CB.30 | Colusite | Cu13VAs3S16 |
2.CB.30 | Germanite | Cu13Fe2Ge2S16 |
2.CB.30 | Germanocolusite | Cu26V2(Ge,As)6S32 |
2.CB.30 | Nekrasovite | Cu26V2(Sn,As,Sb)6S32 |
2.CB.30 | Stibiocolusite | Cu13V(Sb,Sn,As)3S16 |
2.CB.30 | Ovamboite | Cu20(Fe,Cu,Zn)6W2Ge6S32 |
2.CB.30 | Maikainite | Cu20(Fe,Cu)6Mo2Ge6S32 |
2.CB.30 | Frieseite | Ag2Fe5S8 (?) |
2.CB.35a | Hemusite | Cu6SnMoS8 |
2.CB.35a | Kiddcreekite | Cu6SnWS8 |
2.CB.35a | Polkovicite | (Fe,Pb)3(Ge,Fe)1-xS4 |
2.CB.35a | Renierite | (Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 |
2.CB.35a | Vinciennite | Cu+7Cu2+3Fe2+2Fe3+2Sn(As,Sb)S16 |
2.CB.35a | Morozeviczite | (Pb,Fe)3Ge1-xS4 |
2.CB.35b | Catamarcaite | Cu6GeWS8 |
2.CB.40 | Lautite | CuAsS |
2.CB.42 | Lingbaoite | AgTe3 |
2.CB.45 | Cadmoselite | CdSe |
2.CB.45 | Greenockite | CdS |
2.CB.45 | Wurtzite | (Zn,Fe)S |
2.CB.45 | Rambergite | MnS |
2.CB.45 | Buseckite | (Fe,Zn,Mn)S |
2.CB.45 | Maletoyvayamite | Au3Se4Te6 |
2.CB.47 | Murchisite | Cr5S6 |
2.CB.50 | Zincselenide | ZnSe |
2.CB.50 | Wassonite | TiS |
2.CB.52 | Dzhezkazganite | ReMoCu2PbS6 ? |
2.CB.55a | Cubanite | CuFe2S3 |
2.CB.55b | Isocubanite | CuFe2S3 |
2.CB.60 | Picotpaulite | TlFe2S3 |
2.CB.60 | Raguinite | TlFeS2 |
2.CB.65 | Argentopyrite | AgFe2S3 |
2.CB.65 | Sternbergite | AgFe2S3 |
2.CB.70 | Sulvanite | Cu3VS4 |
2.CB.75 | Vulcanite | CuTe |
2.CB.80 | Empressite | AgTe |
2.CB.85 | Muthmannite | AuAgTe2 |
Other Information
Notes:
Distinctly magnetic
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Eskebornite
mindat.org URL:
https://www.mindat.org/min-1409.html
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References for Eskebornite
Localities for Eskebornite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Argentina | |
| Milka K. de Brodtkorb (2002) +3 other references |
Recursos Minerales de la Republica ... +3 other references | |
| Anthony et al. (1990) +1 other reference |
| Grundmann et al. (2018) |
Australia | |
| Rajesh (2008) |
Bolivia | |
| doi:10.3390/min7050068 +2 other references |
Bulgaria | |
| Kerestedjian (1997) |
Canada | |
| Can Min 10:787-796 |
Canadian Mineralogist Vol. 10 (1972) +1 other reference | |
China | |
| Caixia Feng et al. (2002) +1 other reference |
| Dai et al. (2015) |
Czech Republic | |
| Škácha et al. (2017) |
| Sejorka et al. (2014) |
| Sejkora et al. (2022) |
| Scharm et al. (2000) |
| Scharmová et al. (1995) |
| Strübel +2 other references |
| Kvaček +1 other reference |
Kvaček +1 other reference | |
| Vavřín +1 other reference |
Kvaček (1979) +1 other reference | |
Vavřín (1994) | |
Kvaček | |
France | |
| Anthony et al. (1990) +1 other reference |
Germany | |
| Cabral et al. (2018) |
| Weiß (1990) |
| Tischendorf (1969) |
| NJMM (1988) |
| Förster (2004) +1 other reference |
| Forster et al. (2004) |
Poland | |
| Pringle et al. (1980) +2 other references |
USA | |
| Eckel et al. (1997) |
Eckel et al. (1997) | |
| Castor et al. (2004) |
Tharalson +5 other references |
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Slavkovice, Nové Město na Moravě, Žďár nad Sázavou District, Vysočina Region, Czech Republic