Formula: (Cu,Fe,Zn)3(Sn,In)S4
Origin of name: for William Petruk (1930-), Canadian mineralogist
Crystal system: orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 7.667, b = 6.44, c = 6.276
Colour: Brown, gray, greenish in reflected light
Diaphaneity: Opaque
Luster: Metallic
Habit: Round grains to 240 micron, as layers 200 micron wide, grains to 400 micron
Hardness: 4.5
Specific gravity: 4.61
Cleavage: 4; {110}, {100}, {010} distinct, {001} parting
Tenacity:
Streak: Black
Synonyms/varieties:
Comments:
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