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Cobaltite

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Formula:
CoAsS
System:
Orthorhombic
Colour:
Reddish silver white, ...
Lustre:
Metallic
Hardness:
Member of:
Name:
From the German, Kobold, "underground spirit" or "goblin," in allusion to the refusal of cobaltiferous ores to smelt properly, hence "bewitched."
See also the chemically very similar Glaucodot and Alloclasite.

Visit gemdat.org for gemological information about Cobaltite.

Classification of Cobaltite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
2.EB.25

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2.12.3.1

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.10.13

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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Occurrences of Cobaltite

Geological Setting:
High temperature hydrothermal deposits, veins in contact metamorphic rocks.

Physical Properties of Cobaltite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Reddish silver white, violet steel gray, or black.
Streak:
Grayish black
Hardness (Mohs):
Hardness (Vickers):
VHN100=1095 - 1346
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}
Fracture:
Irregular/Uneven
Density:
6.33 g/cm3 (Measured)    6.335 g/cm3 (Calculated)

Crystallography of Cobaltite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pca21
Cell Parameters:
a = 5.582Å, b = 5.582Å, c = 5.582Å
Ratio:
a:b:c = 1 : 1 : 1
Unit Cell Volume:
V 173.93 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Pseudocubic, pseudopyritohedral crystals
Twinning:
{111}, {011}

Crystallographic forms of Cobaltite

Crystal Atlas:
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Cobaltite - {111}, {210}
Cobaltite - {100}, {210}
3d models and HTML5 code kindly provided by www.smorf.nl.

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Chemical Properties of Cobaltite

Formula:
CoAsS
Essential elements:
All elements listed in formula:
Common Impurities:
Cu,Pb,Sb,Fe,Ni

Relationship of Cobaltite to other Species

Series:
Forms a series with Gersdorffite (see here)
Member of:
Other Members of Group:
ChangchengiteIrBiS
GersdorffiteNiAsS
Hollingworthite(Rh,Pt,Pd)AsS
Irarsite(Ir,Ru,Rh,Pt)AsS
JolliffeiteNiAsSe
KalungaitePdAsSe
MaslovitePtBiTe
MayingiteIrBiTe
MicheneritePdBiTe
MilotaitePdSbSe
PadmaitePdBiSe
PlatarsitePtAsS
TestibiopalladitePdTe(Sb,Te)
TolovkiteIrSbS
UllmanniteNiSbS
Willyamite(Co,Ni)SbS
2.EB.05aAurostibiteAuSb2
2.EB.05bBambollaiteCu(Se,Te)2
2.EB.05aCattieriteCoS2
2.EB.05aErlichmaniteOsS2
2.EB.05aFukuchiliteCu3FeS8
2.EB.05aGeversitePtSb2
2.EB.05aHaueriteMnS2
2.EB.05aInsizwaitePt(Bi,Sb)2
2.EB.05aKrut'aiteCuSe2
2.EB.05aLauriteRuS2
2.EB.05aPenroseite(Ni,Co,Cu)Se2
2.EB.05aPyriteFeS2
2.EB.05aSperrylitePtAs2
2.EB.05aTrogtaliteCoSe2
2.EB.05aVaesiteNiS2
2.EB.05aVillamaninite(Cu,Ni,Co,Fe)S2
2.EB.05aDzharkeniteFeSe2
2.EB.05aGaotaiiteIr3Te8
2.EB.10bAlloclasiteCo1-xFexAsS
2.EB.10dCostibiteCoSbS
2.EB.10aFerroseliteFeSe2
2.EB.10aFrohbergiteFeTe2
2.EB.10cGlaucodot(Co0.50Fe0.50)AsS
2.EB.10aKulleruditeNiSe2
2.EB.10aMarcasiteFeS2
2.EB.10aMattagamiteCoTe2
2.EB.10eParacostibiteCoSbS
2.EB.10ePararammelsbergiteNiAs2
2.EB.10fOeniteCoSbAs
2.EB.15aAnduoite(Ru,Os)As2
2.EB.15aClinosaffloriteCoAs2
2.EB.15aLöllingiteFeAs2
2.EB.15aNisbiteNiSb2
2.EB.15aOmeiite(Os,Ru)As2
2.EB.15cPaxiteCuAs2
2.EB.15aRammelsbergiteNiAs2
2.EB.15aSafflorite(Co,Ni,Fe)As2
2.EB.15bSeinäjokite(Fe,Ni)(Sb,As)2
2.EB.20ArsenopyriteFeAsS
2.EB.20GudmunditeFeSbS
2.EB.20Osarsite(Os,Ru)AsS
2.EB.20Ruarsite(Ru,Os)AsS
2.EB.25GersdorffiteNiAsS
2.EB.25Hollingworthite(Rh,Pt,Pd)AsS
2.EB.25Irarsite(Ir,Ru,Rh,Pt)AsS
2.EB.25JolliffeiteNiAsSe
2.EB.25KrutoviteNiAs2
2.EB.25MaslovitePtBiTe
2.EB.25MicheneritePdBiTe
2.EB.25PadmaitePdBiSe
2.EB.25PlatarsitePtAsS
2.EB.25TestibiopalladitePdTe(Sb,Te)
2.EB.25TolovkiteIrSbS
2.EB.25UllmanniteNiSbS
2.EB.25Willyamite(Co,Ni)SbS
2.EB.25ChangchengiteIrBiS
2.EB.25MayingiteIrBiTe
2.EB.25Hollingsworthite
2.EB.25KalungaitePdAsSe
2.EB.25MilotaitePdSbSe
2.EB.30UrvantsevitePd(Bi,Pb)2
2.EB.35RheniiteReS2
3.10.1Cobaltpentlandite(Co,Ni,Fe)9S8
3.10.2LinnaeiteCo2+Co23+S4
3.10.3CattieriteCoS2
3.10.4FrebolditeCoSe
3.10.5BornhardtiteCo2+Co23+Se4
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
3.10.14ParacostibiteCoSbS
3.10.15CostibiteCoSbS
3.10.16AlloclasiteCo1-xFexAsS
3.10.17Glaucodot(Co0.50Fe0.50)AsS
3.10.18CarrolliteCu(Co,Ni)2S4

Other Names for Cobaltite

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.
Industrial Uses:
Cobalt ore.

References for Cobaltite

Reference List:
Klaproth, M.H. (1797): Untersuchung des Glanzkobalts von Tunaberg , Beiträge zur chemischen Kenntniss der Mineralkörper, Zweiter Band, Rottmann Berlin, 302-307

Palache, Charles, Harry Berman & Clifford Frondel (1944): The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 296-298.

American Mineralogist (1965): 50: 1002-1014.

Maurel, C. & Picot, P. (1973): Mechanism of transformation of alloclasite into cobaltite. Lautaret deposit. Bulletin de la Societe Francaise de Mineralogie et de Cristallographie 96, 292-297.

Croxford, N. J. W. (1974): Cobalt mineralization at Mount Isa, Queensland, Australia, with references to Mount Cobalt. Mineralium Deposita 9, 105-115.

Fleet, M.E. and Burns, P.C. (1990) Structure and twinning of cobaltite. Canadian Mineralogist: 28: 719-723.

Internet Links for Cobaltite

Specimens:
The following Cobaltite specimens are currently listed for sale on minfind.com.

Localities for Cobaltite

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.
Mineral and/or Locality  
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