Formula: (Ta,Nb)(OH)3(O,CO3)
Origin of name: For Kim Robinson, Australian discoverer of mineral
Crystal system: Cubic
Crystal class: unknown
Twinning:
Unit cell:
Colour: White
Diaphaneity:
Luster: Dull, chalky
Habit: Cryptocrystalline
Hardness: 2.5
Specific gravity:
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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