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Bornhardtite

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Formula:
Co2+Co3+2Se4
Colour:
Rose-red
Hardness:
4
Specific Gravity:
6.166 (Calculated)
Crystal System:
Isometric
Name:
For Dr. Friedrich Wilhelm Conrad Eduard Bornhardt (20 April 1864 Braunschweig - 2 December 1946 Goslar), German geologist, engineer and explorer, and was Director of the Berlin College of Mines (Bergakademie) from 1907 to 1916.
Se analogue of Linnaeite
A mineral that appears to never have been analyzed! Perhaps = Tyrrellite.


Hide all sections | Show all sections

Classification of BornhardtiteHide

Approved, 'Grandfathered' (first described prior to 1959)
2/D.01-120
2.DA.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
A : M:S = 3:4
2.10.1.5

2 : SULFIDES
10 : AmBnXp, with (m+n):p = 3:4
3.10.5

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
10 : Sulphides etc. of Co

Physical Properties of BornhardtiteHide

Transparency:
Opaque
Colour:
Rose-red
Hardness:
Density:
6.166 g/cm3 (Calculated)

Chemical Properties of BornhardtiteHide

Formula:
Co2+Co3+2Se4

Crystallography of BornhardtiteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Setting:
Fd3m
Cell Parameters:
a = 10.2(2) Å
Unit Cell V:
1,061.21 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Massive

Geological EnvironmentHide

Geological Setting:
Hydrothermal

Type Occurrence of BornhardtiteHide

Other Language Names for BornhardtiteHide

Relationship of Bornhardtite to other SpeciesHide

Other Members of this group:
TrüstedtiteNi3Se4Iso.

Related Minerals - Nickel-Strunz GroupingHide

2.DA.05CarrolliteCu(Co,Ni)2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05Cuproiridsite(Cu,Fe)Ir2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05Cuprorhodsite(Cu1+0.5Fe3+0.5)Rh3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05DaubréeliteFe2+Cr3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05FletcheriteCu(Ni,Co)2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05Florensovite(Cu,Zn)Cr1.5Sb0.5S4Iso. m3m (4/m 3 2/m)
2.DA.05GreigiteFe2+Fe3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05InditeFeIn2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05KalininiteZnCr2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05LinnaeiteCo2+Co3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05MalaniteCu1+(Ir3+Pt4+)S4Iso.
2.DA.05PolydymiteNi2+Ni3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05SiegeniteCoNi2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05TrüstedtiteNi3Se4Iso.
2.DA.05TyrrelliteCu(Co3+,Ni3+)2Se4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05ViolariteFe2+Ni3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05XingzhongitePb2+Ir3+2S4Iso.
2.DA.05Ferrorhodsite(Fe,Cu)(Rh,Ir,Pt)2S4Iso.
2.DA.05CadmoinditeCdIn2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.05CuprokalininiteCuCr2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.DA.10RhodostanniteCu1+(Fe2+0.5Sn4+1.5)S4Tet. 4/m : I41/a
2.DA.10ToyohaiteAg1+(Fe2+0.5Sn4+1.5)S4Tet.
2.DA.15BrezinaiteCr3S4Mon. 2/m
2.DA.15Heideite(Fe,Cr)1.15(Ti,Fe)2S4Mon. 2/m
2.DA.20InaglyiteCu3Pb(Ir,Pt)8S16Hex.
2.DA.20KonderiteCu3Pb(Rh,Pt,Ir)8S16Hex. 6/m : P6/m
2.DA.25Kingstonite(Rh,Ir,Pt)3S4Mon. 2/m : B2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

2.10.1.1LinnaeiteCo2+Co3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.2CarrolliteCu(Co,Ni)2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.3FletcheriteCu(Ni,Co)2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.4TyrrelliteCu(Co3+,Ni3+)2Se4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.6SiegeniteCoNi2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.7PolydymiteNi2+Ni3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.8ViolariteFe2+Ni3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.9TrüstedtiteNi3Se4Iso.
2.10.1.10GreigiteFe2+Fe3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.11DaubréeliteFe2+Cr3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.12InditeFeIn2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.13KalininiteZnCr2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.14Florensovite(Cu,Zn)Cr1.5Sb0.5S4Iso. m3m (4/m 3 2/m)
2.10.1.15Cuproiridsite(Cu,Fe)Ir2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.16Cuprorhodsite(Cu1+0.5Fe3+0.5)Rh3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
2.10.1.17MalaniteCu1+(Ir3+Pt4+)S4Iso.
2.10.1.20CuprokalininiteCuCr2S4Iso. m3m (4/m 3 2/m) : Fd3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.10.1Cobaltpentlandite(Co,Ni,Fe)9S8Iso. m3m (4/m 3 2/m) : Fm3m
3.10.2LinnaeiteCo2+Co3+2S4Iso. m3m (4/m 3 2/m) : Fd3m
3.10.3CattieriteCoS2Iso. m3 (2/m 3) : Pa3
3.10.4FrebolditeCoSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.10.6TrogtaliteCoSe2Iso. m3 (2/m 3) : Pa3
3.10.7HastiteFeSe2Orth.
3.10.8MattagamiteCoTe2Orth.
3.10.9Modderite(Co,Fe)AsOrth.
3.10.10Safflorite(Co,Ni,Fe)As2Orth. mmm (2/m 2/m 2/m) : Pnnm
3.10.11ClinosaffloriteCoAs2Mon. 2/m : P21/m
3.10.12SkutteruditeCoAs3Iso. m3 (2/m 3) : Im3
3.10.13CobaltiteCoAsSOrth. mm2 : Pca21
3.10.14ParacostibiteCoSbSOrth.
3.10.15CostibiteCoSbSOrth. mm2 : Pmn21
3.10.16AlloclasiteCo1-xFexAsSMon. 2 : P21
3.10.17Glaucodot(Co0.50Fe0.50)AsSOrth. mm2 : Pmn21
3.10.18CarrolliteCu(Co,Ni)2S4Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BornhardtiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ramdohr P, Schmitt M (1955) Vier neue natürliche Kobaltselenide vom Steinbruch Trogtal bei Laufenthal im Harz. Neues Jahrbuch für Mineralogie, Monatshefte 1955, 133-142
Fleischer M (1956) New mineral names. American Mineralogist 41, 164.
Ramdohr, Paul (1969) The Ore Minerals and their Intergrowths, Pergamon Press, pp. 1174.

Internet Links for BornhardtiteHide

Localities for BornhardtiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina
 
  • Mendoza Province
    • Luján de Cuyo department
      • Cacheuta
Grundmann, G., & Förster, H. J. (2018). The Sierra de Cacheuta Vein-Type Se Mineralization, Mendoza Province, Argentina. Minerals, 8(4), 127.
Handbook of Mineralogy
Canada
 
  • Saskatchewan
Handbook of Mineralogy
Germany (TL)
 
  • Lower Saxony
    • Goslar District
      • Langelsheim
        • Lautenthal
Am. Mineral. (1956) 41, 164-165; Neues Jahrb. Mineral., Monatsh. (1955) 133–142; Weiss, S. (1990) Mineralfundstellen Atlas, Deutschland West. Weise Verlag, München, 320 pages.; Cabral, A. R., Koglin, N., & Bratz, H. (2012). Gold-bearing ferroselite (FeSe2) from Trogtal, Harz, Germany, and significance of its Co/Ni ratio. Journal of Geosciences, 57(4), 265-272.
    • Göttingen District
      • Osterode am Harz
        • Lerbach
Weiss, S. (1990) Mineralfundstellen Atlas, Deutschland West. Weise Verlag, München, 320 pages.
  • Saxony-Anhalt
    • Mansfeld-Südharz
      • Mansfeld
Wittern: "Mineralfundorte in Deutschland", 2001; Tischendorf, G. (1969). Sources of elements in selenide mineralization near Tilkerode (Harz). International Geology Review, 11(11), 1298-1301.
 
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