Rammelsbergite

arsenide

löllingite

Formula: NiAs2
Arsenide, Löllingite Group
Specific gravity: 7.0 to 7.2
Hardness: 5½ to 6
Streak: Greyish black
Colour: Tin white with faint pinkish hue
Environments:

Hydrothermal environments

Rammelsbergite occurs in nickel and cobalt veins formed at moderate temperatures, with other nickel-cobalt minerals. Associated minerals include skutterudite, safflorite, löllingite, nickeline, bismuth, silver, algodonite, domeykite and uraninite.

Common impurities: Co,Se,S,Fe,Sb

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