Formula: Sb2AsS2
Origin of name: for Victor Pääkkönen, Finnish mineralogist
Crystal system: monoclinic
Crystal class: unknown
Twinning:
Unit cell:
Colour: dark gray
Diaphaneity: opaque
Luster: metallic
Habit: irregular grains to 0.4 mm
Hardness: 2 to 2.5
Specific gravity: 5.21
Cleavage:
Tenacity:
Streak: gray with brownish tint
Synonyms/varieties:
Comments:
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