Formula: (Nb,Ta,W,Ti,Fe,Mn)3O6
Origin of name: from wolframite and ixiolite
Crystal system: monoclinic
Crystal class: m
Twinning:
Unit cell:
Colour: black with gray tint
Diaphaneity: opaque
Luster: semimetallic
Habit: short prismatic grains, to 0.3 x 0.3 x 0.5 mm
Hardness: 5
Specific gravity: 6.30 to 6.55
Cleavage: 2; prismatic good, one nearly perpendicular to first
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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