Formula: Tl(Sb,As)5S8
Origin of name: from Greek para = similar and pierrotite
Crystal system: monoclinic
Crystal class: m
Twinning:
Unit cell:
Colour: black
Diaphaneity: opaque
Luster: semimetallic
Habit: crystals prismatic, to 3 mm
Hardness: 2.5 to 3
Specific gravity: 5.04
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with pierrotite
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