Formula: Tl6(Fe,Ni,Cu)25S26Cl
Origin of name: From composition (Tl, Fe, Ni, S)
Crystal system: Isometric/Cubic
Crystal class: Unknown
Twinning:
Unit cell: a = 10.92
Colour: Bronze-brown, greenish brown
Diaphaneity: Opaque
Luster: Metallic
Habit: Small grains 5 to 100 micron, in aggregates 0.1 to 0.3 mm
Hardness: 1 to 1.5
Specific gravity: 5.26
Cleavage:
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments: Found in pentlandite-galena-chalcopyrite ores, localized at the contact of chalcopyrite and galena and included in pentlandite.
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