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Formula: NiAsS
Sulphide, cobaltite group, forms a series with
cobaltite, and a
complete solid solution with krutovite.
(AM83.403)
Crystal System: Isometric
Specific gravity: 5.9 measured, 5.966 calculated
Hardness: 5½
Streak: Grey-black
Colour: Gray, grayish black, silver white, or tin white
Common impurities: Co,As,Bi,Fe,Co,Sb,Cu
Environments:
Gersdorffite occurs in hydrothermal vein deposits formed at moderate tempertures.
(Webmin)
Associated minerals include nickeline,
nickelskutterudite,
cobaltite, ullmannite,
maucherite, löllingite,
platinum group minerals,
millerite, pyrite,
marcasite, chalcopyrite and
siderite.
(HOM, Mindat)
At Ait Ahmane, Bou Azzer, Morocco, gersdorffite is embedded in calcite,
sometime associated with
nickelskutterudite and
quartz. Crystals are often zoned, with the
outer zone richer in cobalt.
(MinRec 38.5.375)
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