Formula: Pb9As4S15
Origin of name: For Louis Graton, American geologist
Crystal system: Hexagonal
Crystal class: 3m
Twinning:
Unit cell:
Colour: Dark lead-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals prismatic; massive
Hardness: 2.5
Specific gravity: 6.22
Cleavage: None
Tenacity:
Streak: Black
Synonyms/varieties:
Comments:
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