Formula: (Na,K)0.7V6O15
Origin of name: For Harold Bannerman, American geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity:
Luster: Submetallic
Habit: Microscopic crystals subhedral to euhedral, flattened and elongated
Hardness:
Specific gravity: 3.55
Cleavage: 2; {100}perfect, {010}fair
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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