Formula: (Ni,Co)3S4
Origin of name: after locality Siegen district, Westphalia, Germany
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning: common on {111} sometimes polysynthetic
Unit cell: a = 9.387 Å
Colour: light gray to steel-gray, tarnishes copper-red
Diaphaneity: opaque
Luster: metallic
Habit: crystals octahedral, massive, compact to granular
Hardness: 4.5 to 5.5
Specific gravity: 4.5 to 5.8
Cleavage: 1; {001} perfect
Tenacity: subconchoidal to uneven
Streak:
Synonyms/varieties:
Comments:
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