Formula: Pb4As2S7
Origin of name: Named after locality
Crystal system: Orthorhombic
Crystal class: mmm
Twinning:
Unit cell:
Colour: Silver lead grey
Diaphaneity: Opaque
Luster: Metallic
Habit: Tabular
Hardness: 2.5-3
Specific gravity:
Cleavage: None
Tenacity: Brittle, uneven fracture
Streak: Lead grey
Synonyms/varieties:
Comments:
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