Formula: NiAs
Origin of name: from German kupfernickel = copper nickel
Crystal system: hexagonal
Crystal class: 6/m 2/m 2/m
Twinning: on {10-11} fourlings, possible on {31-41}
Unit cell: a = 3.609 Å, c = 5.019 Å
Colour: pale copper-red, tarnishes grayish to blackish
Diaphaneity:
Luster: metallic
Habit: crystals pyramidal, small, rare, massive, reniform, disseminated
Hardness: 5 to 5.5
Specific gravity: 7.78
Cleavage: none
Tenacity: uneven, brittle
Streak: pale brownish black
Synonyms/varieties: niccolite, nickelite
Comments:
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