Formula: NiNi2S4
Origin of name: from Greek for many and twins
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: light gray to steel-gray, tarnishes copper-red or violet gray
Diaphaneity: opaque
Luster: metallic
Habit: crystals octahedral, massive, compact to granular
Hardness: 4.5 to 5.5
Specific gravity: 4.5 to 4.8
Cleavage: 1; {001} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with linnaeite
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