Krutovite

minerals

gersdorffite

nickelskutterudite

rammelsbergite

Images
Formula: NiAs2
Arsenide, paramorph of pararammelsbergite and rammelsbergite, probably a member of the pyrite group. Krutovite forms a complete solid solution series with gersdorffite (AM 83.403).
Specific gravity:
Hardness: 5½
Colour: Greyish white
Common impurities: Co,Fe,Cu,Sb,S
Environments

Hydrothermal environments

Krutovite occurs in copper-nickel-arsenic veins of hydrothermal origin (Webmin, HOM).

Localities

The type locality is Potůčky, Horní Blatná, Karlovy Vary District, Karlovy Vary Region, Czech Republic.
At Jáchymov, also in the Karlovy Vary District, Karlovy Vary Region, Czech Republic, krutovite occurs in ore from the Geshiber vein, as grains, usually in close intergrowth with nickelskutterudite, and also with tennantite (AM 62.174, HOM).

At the uranium-molybdenum deposit, Aksu, Stepnogorsk, Akmola Region, Kazakhstan, krutovite occurs in solid solution with gersdorffite (AM 83.403).

At the Khovu-Aksy Ni-Co deposit, Chedi-Kholsky District, Tuva, Russia, krutovite has been found with nickeline, breithauptite, löllingite, nickelskutterudite, rammelsbergite, pararammelsbergite and silver (AM 62.174, HOM).

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