Formula: (Cu,Ni,Co,Fe)S2
Origin of name: after locality Villamanin, Spain
Crystal system: cubic
Crystal class: -1
Twinning: noted
Unit cell: a = 5.69 Ĺ
Colour: iron-black
Diaphaneity: opaque
Luster: metallic
Habit: crystals cubo-octahedral, irregular groups, radiating nodular masses
Hardness: 4.5
Specific gravity: 4.52
Cleavage: none
Tenacity:
Streak: sooty black
Synonyms/varieties:
Comments:
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