Formula: Tl5Sb9(As,Sb)4S22
Origin of name: For S. Jankovic, of his work on the Allchar deposit, Macedonia
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Metallic
Habit: Subhedral or tabular grains > 1 mm
Hardness: 2
Specific gravity: 5.08
Cleavage: 1; {100} perfect
Tenacity:
Streak: Brown-violet
Synonyms/varieties:
Comments:
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