Formula: Pb26(Cu,Fe)2(Sb,Bi)20S57
Origin of name: From locality; Izok Lake, Canada
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Lead-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Acicular aggregates, tiny
Hardness: 3.7 to 4.2
Specific gravity: 6.47
Cleavage: 1; Parallel to c good
Tenacity:
Streak: Grey-black
Synonyms/varieties:
Comments:
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