Formula: Pb9Sb8S21
Origin of name: for A. von Semsey, Hungarian nobelman
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: lead-gray to black
Diaphaneity: opaque
Luster: metallic, tarnishes dull
Habit: crystals tabular or prismatic, may be twisted, aggregates and subparallel groups
Hardness: 2.5
Specific gravity: 6.08
Cleavage: 1; {112} perfect
Tenacity:
Streak: black
Synonyms/varieties:
Comments:
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