Formula: Cu2(Sb,Tl)
Origin of name: From copper (Latin cuprum) and antimony (Latin stibium)
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 3.990 Å, c = 6.09 Å
Colour: Steel gray, violet red tint on fresh fracture
Diaphaneity: Opaque
Luster: Metallic
Habit: Fine grained aggregates to 1.5 mm
Hardness: 4
Specific gravity: 8.42
Cleavage: 1
Tenacity: Uneven fracture
Streak:
Synonyms/varieties:
Comments: Found as fine-grained aggregates in a vein of ussingite cutting sodalite syenite; in sulphide veins in metamorphic siliceous dolomite
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