Formula: Cu6Hg3Sb4S12
Origin of name: For V.S. Gruzdev, Russian mineralogist
Crystal system: Hexagonal
Crystal class: 3
Twinning:
Unit cell:
Colour: Gray-black
Diaphaneity: Opaque
Luster: Metallic
Habit: Massive
Hardness: 4 to 4.5
Specific gravity: 5.88
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with aktashite
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