Formula: FeSb2S4
Origin of name: For Pierre Berthier, French chemist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Dark steel-gray; tarnishes
brownish or iridescent
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals prismatic, striated vertically; massive, radial or plumose, fibrous
Hardness: 2 to 3
Specific gravity: 4.64
Cleavage: 1; {101} indistinct
Tenacity:
Streak: Dark brownish grey
Synonyms/varieties:
Comments:
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