Formula: AsS
Origin of name: from Greek para = similar and realgar
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 9.93 Å, b = 9.69 Å, c = 8.50 Å, b = 97.1°
Colour: yellow to orange-yellow, orange-brown
Diaphaneity:
Luster: vitreous to resinous
Habit: fine powder, granular aggregates
Hardness: 1 to 1.5
Specific gravity: 3.52
Cleavage: none
Tenacity:
Streak: bright yellow
Synonyms/varieties:
Comments: dimorphous with realgar
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