Formula: Pb5Sb8S17
Origin of name: from Greek plagios = oblique
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: blackish gray
Diaphaneity: opaque
Luster: metallic
Habit: crystals thick tabular or short prismatic, massive, compact or granular
Hardness: 2.5
Specific gravity: 5.54
Cleavage: 1; {112} distinct
Tenacity:
Streak: blackish gray
Synonyms/varieties:
Comments:
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