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Formula: Co9S8
Sulphide, pentlandite group, forms a series with
pentlandite,
cobalt-bearing mineral
Crystal System: Isometric
Specific gravity: 5.22 calculated
Hardness: 4 to 4½
Colour: Yellow
Common impurities: Fe,Ni
Environments
Cobaltpentlandite occurs with other sulphides and arsenides in hydrothermal deposits. Associated minerals include
pyrite, marcasite,
pyrrhotite, troilite,
chalcopyrite, cubanite,
bornite, chalcocite,
digenite, linnaeite,
siegenite, parkerite,
pyrite variety bravoite, langisite and
magnetite
(HOM, Mindat).
Localities
At the Vauze Mine, Rouyn-Noranda TE, Abitibi-Témiscamingue, Quebec, Canada, cobaltpentlandite occurs as fine intergrowths in grains
of linnaeite, associated with chalcopyrite,
sphalerite and pyrrhotite
(AM 50.2107-2108).
The type locality is the Varislahti deposit, Outokumpu Cu-Co-Zn-Ni-Ag-Au ore field, North Karelia, Finland.
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