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Bornhardtite

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Formula:
Co2+Co23+Se4
System:
Isometric
Colour:
Rose-red
Hardness:
4
Name:
For Dr. Wilhelm Bornhardt (1864-?), German
Linnaeite Group and Thiospinel Group, Se analogue of Linnaeite
A mineral that appears to never have been analyzed! Perhaps = Tyrrellite.

Classification of Bornhardtite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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First Recorded Occurrence of Bornhardtite

Year of Discovery:
1955

Occurrences of Bornhardtite

Geological Setting:
Hydrothermal

Physical Properties of Bornhardtite

Diaphaneity (Transparency):
Opaque
Colour:
Rose-red
Hardness (Mohs):
4
Density:
6.166 g/cm3 (Calculated)

Crystallography of Bornhardtite

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

Chemical Properties of Bornhardtite

Formula:
Co2+Co23+Se4
Essential elements:
All elements listed in formula:

Relationship of Bornhardtite to other Species

Other Members of Group:
CadmoinditeCdIn2S4
CarrolliteCu(Co,Ni)2S4
Cuproiridsite(Cu,Fe)Ir2S4
CuprokalininiteCuCr2S4
Cuprorhodsite(Cu,Fe)Rh2S4
DaubréeliteFe2+Cr23+S4
Ferrorhodsite(Fe,Cu)(Rh,Ir,Pt)2S4
FletcheriteCu(Ni,Co)2S4
Florensovite(Cu,Zn)Cr1.5Sb0.5S4
GreigiteFe2+Fe23+S4
InditeFeIn2S4
KalininiteZnCr2S4
LinnaeiteCo2+Co23+S4
MalaniteCu(Pt3+,Ir3+)2S4
PolydymiteNi2+Ni23+S4
SiegeniteCoNi2S4
TrüstedtiteNi3Se4
TyrrelliteCu(Co3+,Ni3+)2Se4
ViolariteFe2+Ni23+S4
Xingzhongite(Pb,Cu,Fe)(Ir,Pt,Rh)2S4
2.DA.05CarrolliteCu(Co,Ni)2S4
2.DA.05Cuproiridsite(Cu,Fe)Ir2S4
2.DA.05Cuprorhodsite(Cu,Fe)Rh2S4
2.DA.05DaubréeliteFe2+Cr23+S4
2.DA.05FletcheriteCu(Ni,Co)2S4
2.DA.05Florensovite(Cu,Zn)Cr1.5Sb0.5S4
2.DA.05GreigiteFe2+Fe23+S4
2.DA.05InditeFeIn2S4
2.DA.05KalininiteZnCr2S4
2.DA.05LinnaeiteCo2+Co23+S4
2.DA.05MalaniteCu(Pt3+,Ir3+)2S4
2.DA.05PolydymiteNi2+Ni23+S4
2.DA.05SiegeniteCoNi2S4
2.DA.05TrüstedtiteNi3Se4
2.DA.05TyrrelliteCu(Co3+,Ni3+)2Se4
2.DA.05ViolariteFe2+Ni23+S4
2.DA.05Xingzhongite(Pb,Cu,Fe)(Ir,Pt,Rh)2S4
2.DA.05Ferrorhodsite(Fe,Cu)(Rh,Ir,Pt)2S4
2.DA.05CadmoinditeCdIn2S4
2.DA.05CuprokalininiteCuCr2S4
2.DA.10RhodostanniteCu2FeSn3S8
2.DA.10ToyohaiteAg2FeSn3S8
2.DA.15BrezinaiteCr3S4
2.DA.15Heideite(Fe,Cr)1.15(Ti,Fe)2S4
2.DA.20InaglyiteCu3Pb(Ir,Pt)8S16
2.DA.20KonderiteCu3Pb(Rh,Pt,Ir)8S16
2.DA.25Kingstonite(Rh,Ir,Pt)3S4
3.10.1Cobaltpentlandite(Co,Ni,Fe)9S8
3.10.2LinnaeiteCo2+Co23+S4
3.10.3CattieriteCoS2
3.10.4FrebolditeCoSe
3.10.6TrogtaliteCoSe2
3.10.7Hastite
3.10.8MattagamiteCoTe2
3.10.9Modderite(Co,Fe)As
3.10.10Safflorite(Co,Ni,Fe)As2
3.10.11ClinosaffloriteCoAs2
3.10.12SkutteruditeCoAs3-x
3.10.13CobaltiteCoAsS
3.10.14ParacostibiteCoSbS
3.10.15CostibiteCoSbS
3.10.16AlloclasiteCo1-xFexAsS
3.10.17Glaucodot(Co0.50Fe0.50)AsS
3.10.18CarrolliteCu(Co,Ni)2S4

Other Names for Bornhardtite

Name in Other Languages:

Other Information

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 Bornhardtite

Reference List:
Ramdohr, P. (1955): Neues Jahrb. Monatsh. Mineral., 133-142.

American Mineralogist: 41: 164.

Internet Links for Bornhardtite

Localities for Bornhardtite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • Lower Saxony
    • Harz
      • Clausthal-Zellerfeld
        • Rosenhof veins
          • Lerbach
Weiss: "Mineralfundstellen, Deutschland West", 1990
      • Lautenthal
Am. Mineral. (1956) 41, 164-165; Neues Jahrb. Mineral., Monatsh. (1955) 133–142; Weiss: "Mineralfundstellen, Deutschland West", 1990
  • Saxony-Anhalt
    • Harz
Wittern: "Mineralfundorte in Deutschland", 2001
Mineral and/or Locality  
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