Formula: Bi(Nb,Ta)O4
Origin of name: From bismuth and columbite
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 4.992, b = 11.731, c = 5.677
Colour: Black
Diaphaneity: Translucent to opaque
Luster: Semimetallic
Habit: Prismatic crystals to 1-2 mm, striated perpendicular to elongation
Hardness: 5.5
Specific gravity: 7.56
Cleavage: 1; {001} perfect
Tenacity: Brittle, conchoidal fracture
Streak: Brown to yellowish brown
Synonyms/varieties:
Comments:
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