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Cobaltite

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Formula:
CoAsS
Colour:
Reddish silver white, violet steel gray, or black.
Lustre:
Metallic
Hardness:
Specific Gravity:
6.33
Crystal System:
Orthorhombic
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. Compare 'UM1966-01-As:CoNiS' and 'UM1982-09-S:AsCoFeNi'.

Visit gemdat.org for gemological information about Cobaltite.


Classification of Cobaltite

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of Cobaltite

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

Chemical Properties of Cobaltite

Formula:
CoAsS
Common Impurities:
Cu,Pb,Sb,Fe,Ni

Crystallography of Cobaltite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pca21
Cell Parameters:
a = 5.582 Å, b = 5.582 Å, c = 5.582 Å
Ratio:
a:b:c = 1 : 1 : 1
Unit Cell 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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Transparency
Opaque | Translucent | Transparent

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Synonyms of Cobaltite

Other Language Names for Cobaltite

Varieties of Cobaltite

Ferroan Cobaltite
Palladian Cobaltite

May contain as much as 1.10 wt.% Pd.

Relationship of Cobaltite to other Species

Member of:
Other Members of this 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
Forms a series with:

Common Associates

Allanite Group{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
CalciteCaCO3
ChalcopyriteCuFeS2
MagnetiteFe2+Fe3+2O4
ScapoliteThis term generally refers to just the marialite-meionite series, not the full scapolite group, ...
SkutteruditeCoAs3
SphaleriteZnS
TitaniteCaTi(SiO4)O
Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Associated Minerals Based on Photo Data:
Chalcopyrite26 photos of Cobaltite associated with Chalcopyrite on mindat.org.
Actinolite26 photos of Cobaltite associated with Actinolite on mindat.org.
Erythrite20 photos of Cobaltite associated with Erythrite on mindat.org.
Pyrrhotite13 photos of Cobaltite associated with Pyrrhotite on mindat.org.
Silver9 photos of Cobaltite associated with Silver on mindat.org.
Magnesite9 photos of Cobaltite associated with Magnesite on mindat.org.
Scorodite8 photos of Cobaltite associated with Scorodite on mindat.org.
Quartz6 photos of Cobaltite associated with Quartz on mindat.org.
Bismuth4 photos of Cobaltite associated with Bismuth on mindat.org.
Dolomite4 photos of Cobaltite associated with Dolomite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

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(Rh,Pt,Pd)AsS
2.EB.25KalungaitePdAsSe
2.EB.25MilotaitePdSbSe
2.EB.30UrvantsevitePd(Bi,Pb)2
2.EB.35RheniiteReS2

Related Minerals - Hey's Chemical Index of Minerals Grouping

3.10.1Cobaltpentlandite(Co,Ni,Fe)9S8
3.10.2LinnaeiteCo2+Co3+2S4
3.10.3CattieriteCoS2
3.10.4FrebolditeCoSe
3.10.5BornhardtiteCo2+Co3+2Se4
3.10.6TrogtaliteCoSe2
3.10.7HastiteFeSe2
3.10.8MattagamiteCoTe2
3.10.9Modderite(Co,Fe)As
3.10.10Safflorite(Co,Ni,Fe)As2
3.10.11ClinosaffloriteCoAs2
3.10.12SkutteruditeCoAs3
3.10.14ParacostibiteCoSbS
3.10.15CostibiteCoSbS
3.10.16AlloclasiteCo1-xFexAsS
3.10.17Glaucodot(Co0.50Fe0.50)AsS
3.10.18CarrolliteCu(Co,Ni)2S4

Related Minerals - Dana Grouping (8th Ed.)

2.12.3.2GersdorffiteNiAsS
2.12.3.3UllmanniteNiSbS
2.12.3.4Willyamite(Co,Ni)SbS
2.12.3.5TolovkiteIrSbS
2.12.3.6PlatarsitePtAsS
2.12.3.7Irarsite(Ir,Ru,Rh,Pt)AsS
2.12.3.8Hollingworthite(Rh,Pt,Pd)AsS
2.12.3.9JolliffeiteNiAsSe
2.12.3.10PadmaitePdBiSe
2.12.3.11MicheneritePdBiTe
2.12.3.12MaslovitePtBiTe
2.12.3.13TestibiopalladitePdTe(Sb,Te)

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.

Cobaltite in petrology

Common component of (items highlighted in red)

References for Cobaltite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Andrei Y. Barkov, Yana Fedortchouk, Robert A. Campbell, Tapio A.A. Halkoaho (2015) Coupled substitutions in PGE-enriched cobaltite: new evidence from the Rio Jacaré layered complex, Bahia state, Brazil. Mineralogical Magazine, 79, 1185-1193.

Internet Links for Cobaltite

mindat.org URL:
https://www.mindat.org/min-1093.html
Please feel free to link to this page.
Specimens:
The following Cobaltite specimens are currently listed for sale on minfind.com.

Localities for Cobaltite

Mineral and/or Locality  
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