Formula: PbBi4Te7
Origin of name: After locality; Kochkar deposit, Russia
Crystal system: Hexagnonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: Silver-gray
Diaphaneity:
Luster: Metallic
Habit: Platy tabular crystals often curved to 3 x 10 x 10 mm
Hardness: 2 to 2.5
Specific gravity: 7.94
Cleavage: 1; Basal perfect
Tenacity:
Streak: Lead-gray
Synonyms/varieties:
Comments: Tarnishes in air
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