Formula: Cu9S5
Origin of name: after locality Roxby Downs, Australia
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 53.79, b = 30.9, c = 13.36, β = 90°
Colour: Blue-black
Diaphaneity: Opaque
Luster: Metallic-dull
Habit: crystals to 0.01 mm, powdery, aggregates
Hardness: 2.5
Specific gravity: 5.555
Cleavage: 1; {100} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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