Löllingite

arsenide

Formula: FeAs2
Arsenide
There is complete solid solution between safflorite and löllingite, limited solution of cobalt in rammelsbergite and no solid solution between löllingite and rammelsbergite (AM53.1856, Mindat).
Specific gravity: 7.43
Hardness: 5 to 5½
Streak: Greyish black
Colour: Steel grey to silver white
Environments:

Pegmatites
Metamorphic environments

Löllingite occurs in mesothermal deposits associated with other suphides and calcite gangue; it is also found in pegmatites (Webmin). Associated minerals include skutterudite, bismuth, nickeline, nickelskutterudite, siderite and calcite (HOM).

Common impurities: Bi

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