Formula: AgBiS2
Origin of name: Locality; Matilda mine, Morococha, Peru
Crystal system: Hexagonal (trigonal
Crystal class: 3 2/m
Twinning:
Unit cell: a = 4.066, c = 18.958
Colour: Gray to iron-black
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals indistinct acicular or prismatic, striated parallel to elongation, rare; massive, granular
Hardness: 2.5
Specific gravity: 6.99
Cleavage: None
Tenacity: Brittle
Streak: Light gray
Synonyms/varieties: Schapbachite
Comments:
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