Formula: Al3(V,V)40O100 . 90H2O
Origin of name: For Pierre Bariand, French mineralogist and curator
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Nearly opaque
Luster:
Habit: Small fibres
Hardness:
Specific gravity: 2.7
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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