Formula: Hg3(Sb,As)S3
Origin of name: for A. Tvalchrelidze, Georgian mineralogist
Crystal system: monoclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: lead-gray
Diaphaneity: opaque
Luster: adamantine
Habit: granular aggregates
Hardness: about 3
Specific gravity: 7.38
Cleavage: 1; perfect
Tenacity:
Streak: nearly black with dark red tint
Synonyms/varieties:
Comments:
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