Formula: (Ti,Ta,Fe)3O6
Origin of name: for G. Strüver, Italian mineralogist
Crystal system: 4/m 2/m 2/m
Crystal class:
Twinning:
Unit cell:
Colour: brown-black to black
Diaphaneity: opaque
Luster: submetallic
Habit:
Hardness: 6 to 6.5
Specific gravity: 5.25
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with ilmenorutile
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