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Eskebornite

A valid IMA mineral species - grandfathered
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08961480017271922635411.jpg
Eskebornite, etc.

Slavkovice, Nové Město na Moravě, Žďár nad Sázavou District, Vysočina Region, Czech Republic
03313710017271922668854.jpg
Eskebornite, etc.

Bukov Mine, Rožná deposit, Rožná, Žďár nad Sázavou District, Vysočina Region, Czech Republic
06327990017271922728828.jpg
Eskebornite, etc.

Bukov Mine, Rožná deposit, Rožná, Žďár nad Sázavou District, Vysočina Region, Czech Republic
08961480017271922635411.jpg
Eskebornite, etc.

Slavkovice, Nové Město na Moravě, Žďár nad Sázavou District, Vysočina Region, Czech Republic
03313710017271922668854.jpg
Eskebornite, etc.

Bukov Mine, Rožná deposit, Rožná, Žďár nad Sázavou District, Vysočina Region, Czech Republic
06327990017271922728828.jpg
Eskebornite, etc.

Bukov Mine, Rožná deposit, Rožná, Žďár nad Sázavou District, Vysočina Region, Czech Republic
08961480017271922635411.jpg
Eskebornite, etc.

Slavkovice, Nové Město na Moravě, Žďár nad Sázavou District, Vysočina Region, Czech Republic
03313710017271922668854.jpg
Eskebornite, etc.

Bukov Mine, Rožná deposit, Rožná, Žďár nad Sázavou District, Vysočina Region, Czech Republic
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About EskeborniteHide

Formula:
CuFeSe2
Colour:
Brass yellow
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
5.35
Crystal System:
Tetragonal
Name:
Named for the Eskeborn adit, Tilkerode, Germany, the type locality.
Chalcopyrite Group. Chalcopyrite-Eskebornite Series.


Unique IdentifiersHide

Mindat ID:
1409
Long-form identifier:
mindat:1:1:1409:6

IMA Classification of EskeborniteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1950
Type description reference:
Ramdohr, P. (1950) Neue Erzmineralien. Fortschritte der Mineralogie: 28: 69-70.

Classification of EskeborniteHide

Strunz-mindat (2025):
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.
Dana 8th ed.:
2.9.1.2

2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
Hey's CIM Ref.:
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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
EbnIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of EskeborniteHide

Lustre:
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}
Density:
5.35 g/cm3 (Measured)    5.44 g/cm3 (Calculated)

Optical Data of EskeborniteHide

Anisotropism:
Marked - yellowish to tan
Reflectivity:
WavelengthR1 (%)R2 (%)
400nm22.0%24.5%
440nm26.5%30.1%
480nm28.7%33.1%
520nm30.4%35.0%
560nm31.6%36.0%
600nm32.6%36.4%
640nm33.3%37.0%
680nm33.8%38.1%
700nm34.0%38.7%


Graph shows reflectance levels at different wavelengths (in nm). 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 EskeborniteHide

Mindat Formula:
CuFeSe2
Element Weights:
Element% weight
Se56.947 %
Cu22.915 %
Fe20.138 %

Calculated from ideal end-member formula.
Elements listed:
Cu, Fe, Se - search for minerals with similar chemistry

Crystallography of EskeborniteHide

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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014365EskeborniteDelgado J M, Diaz de Delgado G, Quintero M, Woolley J C (1992) The crystal structure of copper iron selenide, CuFeSe2 Materials Research Bulletin 27 367-3731992synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])
Geological Setting:
Low temperature hydrothermal deposits

Type Occurrence of EskeborniteHide

Type Locality:
ⓘ Eskaborn adit, Tilkerode Mining District, Mansfeld, Mansfeld-Südharz, Saxony-Anhalt, Germany
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:
ChalcopyriteClausthaliteTiemanniteBerzelianiteNaumannite
UmangiteGeffroyiteChaméaniteUraniniteAnkerite
Dolomite
Reference:
Ramdohr, P. (1950) Neue Erzmineralien. Fortschritte der Mineralogie: 28: 69-70.

Other Language Names for EskeborniteHide

German:Eskebornit
Simplified Chinese:硒黄铜矿
Spanish:Eskebornita
Traditional Chinese:硒黃銅礦

Relationship of Eskebornite to other SpeciesHide

Member of:
Chalcopyrite Group
Other Members of Chalcopyrite Group:
ChalcopyriteCuFeS2Tet. 4 2m : I4 2d
GalliteCuGaS2Tet. 4 2m : I4 2d
LaforêtiteAgInS2Tet. 4 2m : I4 2d
LenaiteAgFeS2Tet. 4 2m : I4 2d
RoquesiteCuInS2Tet. 4 2m : I4 2d
ShenzhuangiteNiFeS2Tet. 4 2m : I4 2d
Unnamed (Cu-Mn-Sn Sulphide)Cu2MnSnS4
Forms a series with:
ChalcopyriteChalcopyrite-Eskebornite Series

Common AssociatesHide

Associated Minerals Based on Photo Data:
48 photos of Eskebornite associated with ClausthalitePbSe
41 photos of Eskebornite associated with KlockmanniteCuSe
17 photos of Eskebornite associated with UmangiteCu3Se2
9 photos of Eskebornite associated with ChalcopyriteCuFeS2
8 photos of Eskebornite associated with EucairiteAgCuSe
8 photos of Eskebornite associated with NaumanniteAg2Se
8 photos of Eskebornite associated with CalciteCaCO3
7 photos of Eskebornite associated with GoethiteFe3+O(OH)
7 photos of Eskebornite associated with TyrrelliteCu(Co,Ni)2Se4
6 photos of Eskebornite associated with MalachiteCu2(CO3)(OH)2

Related Minerals - Strunz-mindat GroupingHide

2.CB.RichardsiteZn2CuGaS4Tet. 4 2m : I4 2m
2.CB.OkruginiteCu2SnSe3Mon. m : Bb
2.CB.HanswilkeiteKFeS2Mon. 2/m : B2/b
2.CB.AuroselenideAuSeMon. 2/m : B2/m
2.CB.Ruizhongite(Ag2◻)Pb3Ge2S8Iso. 4 3m : I4 3d
2.CB.AgmantiniteAg2MnSnS4Orth.
2.CB.TolstykhiteAu3S4Te6Tric. 1 : P1
2.CB.GachingiteAu(Te1-xSex)Orth. mmm (2/m 2/m 2/m)
2.CB.05aHawleyiteCdSIso. 4 3m : F4 3m
2.CB.05UM1998-15-S:CuFeZnCu2Fe3Zn5S10
2.CB.05aColoradoiteHgTeIso. 4 3m : F4 3m
2.CB.05aMetacinnabarHgSIso. 4 3m : F4 3m
2.CB.05aTiemanniteHgSeIso. 4 3m : F4 3m
2.CB.05aSphaleriteZnSIso. 4 3m : F4 3m
2.CB.05bSakuraiite(Cu,Zn,Fe)3(In,Sn)S4 Iso.
2.CB.05cPolhemusite(Zn,Hg)STet.
2.CB.05aRudashevskyite(Fe,Zn)SIso. 4 3m : F4 3m
2.CB.05aStilleiteZnSeIso. 4 3m : F4 3m
2.CB.05aIshiharaite(Cu,Ga,Fe,In,Zn)SIso. 4 3m : F4 3m
2.CB.07aUnnamed (Cu-Mn-Sn Sulphide)Cu2MnSnS4
2.CB.07aShenzhuangiteNiFeS2Tet. 4 2m : I4 2d
2.CB.10bTalnakhiteCu9(Fe,Ni)8S16Iso. 4 3m : I4 3m
2.CB.10bHaycockiteCu4Fe5S8Orth. 2 2 2
2.CB.10aLenaiteAgFeS2Tet. 4 2m : I4 2d
2.CB.10aGalliteCuGaS2Tet. 4 2m : I4 2d
2.CB.10aRoquesiteCuInS2Tet. 4 2m : I4 2d
2.CB.10aUM1984-30-S:CuFeSnCu2Fe2Sn3S7
2.CB.10cOmariniiteCu8Fe2ZnGe2S12Orth. 2 2 2 : I2 2 2
2.CB.10aChalcopyriteCuFeS2Tet. 4 2m : I4 2d
2.CB.10aUnnamed (Cu-Zn-In Sulphide)CuZn2InS4
2.CB.10bMooihoekiteCu9Fe9S16Tet. 4 2m : P4 2m
2.CB.10aLaforêtiteAgInS2Tet. 4 2m : I4 2d
2.CB.10bPutoraniteCu1.1Fe1.2S2Iso. m3m (4/m 3 2/m) : Pn3m
2.CB.15aVelikiteCu2HgSnS4Tet. 4 : I4
2.CB.15cUM2006-11-S:CuFeGeZnCu8(Fe,Zn)3Ge2S12 (?)
2.CB.15aHocartiteAg2(Fe2+,Zn)SnS4Tet. 4 2m : I4 2m
2.CB.15aKësteriteCu2ZnSnS4Tet. 4 : I4
2.CB.15aPirquitasiteAg2ZnSnS4Tet. 4 : I4
2.CB.15aStanniteCu2FeSnS4Tet. 4 2m : I4 2m
2.CB.15cStannoiditeCu+6Cu2+2(Fe2+,Zn)3Sn2S12Orth. 2 2 2 : I2 2 2
2.CB.15bMohiteCu2SnS3Mon.
2.CB.15aČernýiteCu2(Cd,Zn,Fe)SnS4Tet. 4 2m : I4 2m
2.CB.15aIdaiteCu5FeS6Hex.
2.CB.15aFerrokësteriteCu2FeSnS4Tet. 4 : I4
2.CB.15aKuramiteCu3SnS4Tet. 4 2m : I4 2m
2.CB.17a vArsenic-bearing RenieriteCu11GeAsFe4S16
2.CB.20MawsoniteCu6Fe2SnS8Tet. 4 2m : P4m2
2.CB.20ChatkaliteCu6FeSn2S8Tet. 4 2m : P4m2
2.CB.30FrieseiteAg2Fe5S8 (?)
2.CB.30NekrasoviteCu26V2(Sn,As,Sb)6S32Iso. 4 3m : P4 3n
2.CB.30Argyropyritenear Ag2Fe7S11
2.CB.30MaikainiteCu20(Fe,Cu)6Mo2Ge6S32Iso. m3m (4/m 3 2/m)
2.CB.30ColusiteCu13VAs3S16Iso. 4 3m : P4 3n
2.CB.30GermaniteCu13Fe2Ge2S16Iso. 4 3m : P4 3n
2.CB.30GermanocolusiteCu26V2(Ge,As)6S32Iso. 4 3m : P4 3m
2.CB.30StibiocolusiteCu13V(Sb,Sn,As)3S16Iso. 4 3m : P4 3m
2.CB.30Ovamboite Cu20(Fe,Cu,Zn)6W2Ge6S32Iso. 4 3m : P4 3n
2.CB.35aMorozeviczite(Pb,Fe)3Ge1-xS4Iso.
2.CB.35aRenierite(Cu1+,Zn)11Fe4(Ge4+,As5+)2S16Tet. 4 2m : P4 2c
2.CB.35aHemusiteCu6SnMoS8Iso.
2.CB.35bCatamarcaiteCu6GeWS8Hex. 6mm : P63mc
2.CB.35aVincienniteCu+7Cu2+3Fe2+2Fe3+2Sn(As,Sb)S16Tet.
2.CB.35aKiddcreekiteCu6SnWS8Iso. 4 3m : F4 3m
2.CB.35aPolkovicite(Fe,Pb)3(Ge,Fe)1-xS4Iso.
2.CB.40LautiteCuAsSOrth. mmm (2/m 2/m 2/m) : Pnma
2.CB.42LingbaoiteAgTe3Trig. 3m : R3m
2.CB.45CadmoseliteCdSeHex. 6mm : P63mc
2.CB.45RambergiteMnSHex. 6mm : P63mc
2.CB.45Buseckite(Fe,Zn,Mn)SHex. 6mm : P63mc
2.CB.45MaletoyvayamiteAu3Se4Te6Tric. 1 : P1
2.CB.45GreenockiteCdSHex. 6mm : P63mc
2.CB.45Wurtzite(Zn,Fe)SHex. 6mm : P63mc
2.CB.47MurchisiteCr5S6Trig. 3m (3 2/m) : P3 1c
2.CB.50ZincselenideZnSe
2.CB.50WassoniteTiSTrig. 3m (3 2/m) : R3m
2.CB.52DzhezkazganiteReMoCu2PbS6 ?Trig. 3m : R3m
2.CB.55bIsocubaniteCuFe2S3Iso. m3m (4/m 3 2/m) : Fm3m
2.CB.55aCubaniteCuFe2S3Orth. mmm (2/m 2/m 2/m)
2.CB.60RaguiniteTlFeS2Orth.
2.CB.60PicotpauliteTlFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
2.CB.65ArgentopyriteAgFe2S3Mon. 2/m
2.CB.65SternbergiteAgFe2S3Orth. mmm (2/m 2/m 2/m)
2.CB.70SulvaniteCu3VS4Iso. 4 3m : P4 3m
2.CB.75VulcaniteCuTeOrth. mmm (2/m 2/m 2/m)
2.CB.80EmpressiteAgTeOrth. mmm (2/m 2/m 2/m)
2.CB.85MuthmanniteAuAgTe2Mon. 2/m : P2/m

Other InformationHide

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 EskeborniteHide

References for EskeborniteHide

Reference List:
Ramdohr, P. (1950) Neue Erzmineralien. Fortschritte der Mineralogie: 28: 69-70.
Fleischer, M. (1954) New mineral names. American Mineralogist: 39: 690-692.
Tischendorf, G. (1960) Uber Eskebornit von Tilkerode im Harz. Neues Jahrbuch für Mineralogie - Abhandlungen: 94 (Ramdohr Festband): 1169-1182.
Fleischer, Michael (1961) New mineral names. American Mineralogist, 46 (3-4). 464-468
Harris, D.C., Burke, E.A.J. (1971) Eskebornite, two Canadian Occurrences. The Canadian Mineralogist: 10: 787-796.
Fleischer, M. (1972) New mineral names. American Mineralogist: 57: 1552-1561.
Kvaček, M. (1973) Selenides from the uranium deposits of western Moravia, Czechoslovakia. Part 1. Berzelianite, umangite, eskebornite. Acta Universitatis Carolinae, Geologica: 1-2: 23–36.
Johan, Z. (1988) Crystal symmetry of eskebornite, CuFeSe2. Neues Jahrbuch für Mineralogie - Monatshefte, 1988. 337-343
Jambor, John L., Burke, Ernst A. J. (1989) New Mineral Names. American Mineralogist, 74 (11-12) 1399-1404
Delgado, J.M.; de Delgado, G.Diaz; Quintero, M.; Woolley, J.C. (1992) The crystal structure of copper iron selenide, CuFeSe2. Materials Research Bulletin, 27 (3). 367-373 doi:10.1016/0025-5408(92)90066-9
Dorofeev, Yu.A., Men'shikov, A.Z., Pleshchëv, V. G. (1994) Crystal and magnetic structure of eskebornite CeFeSe2. Physics of the Solid State: 36(8): 1329-1332.
Tinoco, T., Polian, A., Itie, J.P., Grima, P., Moya, E., San Miguel, A., Gonzalez, J., Gonzalez-Jimenez, F. (1996) Structural studies on CuFeSe2 (eskebornite) under high pressure. High Pressure Science and Technology, Proc. Jt. XV AIRAPT XXXIII EHPRG Int. Conf., W.A. Trzeciakowski, ed., World Scientific, Singapore: 445-447.
(2005) Eskebornite. Handbook of Mineralogy. Mineralogical Society of America

Localities for EskeborniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.
Argentina
 
  • La Rioja Province
    • General Lamadrid Department
      • Villa Castelli
        • Sierra de Cacho
Brodtkorb (2002) +3 other references
Recursos Minerales de la Republica ... +4 other references
  • Mendoza Province
    • Luján de Cuyo department
      • Cacheuta District
Anthony et al. (1990) +1 other reference
          • Cerro de Cacheuta
Zappettini et al. (2014) +1 other reference
Australia
 
  • Northern Territory
    • West Arnhem Region
      • South Alligator River
        • Rockhole area
Rajesh (2008)
Bolivia
 
  • Potosí
    • Antonio Quijarro Province
      • Porco Municipality
doi:10.3390/min7050068 +2 other references
Bulgaria
 
  • Haskovo Province
    • Ivaylovgrad Municipality
      • Ivaylovgrad
Kerestedjian (1997)
Canada
 
  • Saskatchewan
    • Beaverlodge Lake area
Can Min 10:787-796
Canadian Mineralogist Vol. 10 (1972) +1 other reference
China
 
  • Hubei
    • Enshi Autonomous Prefecture (E'xi Autonomous Prefecture)
      • Enshi Co.
Caixia Feng et al. (2002) +1 other reference
  • Xinjiang
    • Ili Kazakh Autonomous Prefecture
      • Chabucha'er Xibo Co. (Qapqal Xibe Co.; Chapchal Shibe Co.)
Dai et al. (2015)
Czech Republic
 
  • Central Bohemian Region
Škácha et al. (2017)
      • Háje
        • Uranium Mine No. 16
Sejkora et al. (2024)
  • Olomouc Region
    • Jeseník District
      • Javorník
        • Zálesí
Sejkora et al. (2014)
  • Plzeň Region
    • Klatovy District
      • Nalžovské Hory
        • Ústaleč
Sejkora et al. (2022) +1 other reference
    • Plzeň-South District
      • Spálené Poříčí
Scharm et al. (2000)
    • Tachov District
      • Zadní Chodov
Scharmová et al. (1995)
  • South Bohemian Region
    • Písek District
      • Kovářov
        • Předbořice
Strübel +2 other references
  • Vysočina Region
    • Žďár nad Sázavou District
      • Nové Město na Moravě
Kvaček +1 other reference
Kvaček +1 other reference
      • Rožná
        • Rožná deposit
Vavřín +1 other reference
Kvaček (1979) +1 other reference
Vavřín (1994)
Kvaček
France
 
  • Auvergne-Rhône-Alpes
    • Puy-de-Dôme
      • Issoire
        • Le Vernet-Chaméane
Anthony et al. (1990) +1 other reference
Germany
 
  • Lower Saxony
    • Goslar District
      • Clausthal-Zellerfeld
Cabral et al. (2018)
    • Göttingen District
      • Harz (Landkreis Göttingen)
Weiß (1990)
  • Saxony-Anhalt
    • Mansfeld-Südharz
      • Mansfeld
Tischendorf (1969)
Johan (1988)
  • Saxony
    • Erzgebirgskreis
      • Aue-Bad Schlema
Förster (2004) +1 other reference
          • Shaft 366
Forster et al. (2004)
Poland
 
  • Lower Silesian Voivodeship
    • Kłodzko County
      • Gmina Stronie Śląskie
Pringle et al. (1980) +2 other references
UK
 
  • England
    • Devon
      • Torbay
        • Torquay
Dr. Günter Grundmann collection
USA
 
  • Colorado
    • Garfield County
      • East Rifle Creek area
Eckel et al. (1997)
Eckel et al. (1997)
  • Nevada
    • Elko County
Castor et al. (2004)
Tharalson +5 other references
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