Formula: Tl(As,Sb)5S5
Origin of name: For Jan Bernard, Czech physician
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity:
Luster:
Habit: Dull, striated, partly corroded thick tabular crystals mostly <1 mm up to 4 x 3 x 1.5 mm
Hardness: 2
Specific gravity: 4.5
Cleavage: None
Tenacity:
Streak: Red
Synonyms/varieties:
Comments:
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