Formula: Pb2+xCux(Sb,Bi)2-xS5 x ≈ 0.2
Origin of name: For Stanislaw Jaskolski, Polish mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Lead-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals lath-shaped; anhedral grains
Hardness: 3.5
Specific gravity: 6.50 to 6.551
Cleavage: None
Tenacity:
Streak: Dark gray
Synonyms/varieties:
Comments:
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