Formula: Fe5V3V12O39(OH)9 . 8 1/2H2O
Origin of name: After locality; Kazakhstan
Crystal system: Monoclinic
Crystal class: m or 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity:
Luster: Dull, adamantine
Habit: Small round and oval grains in aggregates to 0.5 x 1.5 cm, as thin anastomosing veins or cement in breccias
Hardness: 2.5
Specific gravity: 3.5
Cleavage: 1; {001} perfect
Tenacity:
Streak: Black with slight brownish tint
Synonyms/varieties:
Comments: Soluble in cold acids
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