Formula: Na2(Ta,Nb)4O11
Origin of name: From locality; Irtysh River, Kazakhstan
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Adamantine
Habit: Irregular grains to 0.05 mm; veinlets to 0.02-0.03 mm
Hardness:
Specific gravity: 7.03
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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