Formula: CuAuTe4
Origin of name: For Ivan Kostov, Bulgarian mineralogist (1912-)
Crystal system: Monoclinic
Crystal class: mm2
Twinning:
Unit cell: a = 16.5, b = 8.84, c = 4.42
Colour: Grayish white
Diaphaneity: Opaque
Luster: Metallic
Habit: Grains equant to slightly elongated, aggregates or enclosed in other ore minerals
Hardness: 2 to 2.5
Specific gravity: 8.43
Cleavage: 1; Distinct
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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