Formula: Pb17(Sb,As)16S41
Origin of name: From locality; near Madoc, Quebec, Canada
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Gray-black
Diaphaneity: Opaque
Luster: Metallic
Habit: Small grains, elongated, striated
Hardness: 3 to 3.5
Specific gravity: 5.98
Cleavage: 1; {010} perfect
Tenacity:
Streak: Gray-black
Synonyms/varieties:
Comments:
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