Formula: Ag5SbS4
Origin of name: for Victor Stephan, Mining director of Austria
Crystal system: orthorhombic
Crystal class: mm2
Twinning: common on {110} repeated, less common on {130}, {100} or {010}
Unit cell: a = 7.793 Å, b = 12.30 Å, c = 8.506 Å
Colour: iron-black
Diaphaneity: opaque
Luster: metallic
Habit: crystals short prismatic to tabular, oblique striations on prisms, massive, compact
Hardness: 2 to 2.5
Specific gravity: 6.25
Cleavage: 2; {010} and {021} imperfect
Tenacity: subconchoidal to uneven, brittle
Streak: iron-black
Synonyms/varieties:
Comments:
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