Formula: VTiO3(OH)
Origin of name: from elements in composition (TItanium, VANadium)
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Very common to universal, as seen in section; by four complex twin laws determined from structural analysis, enhancing the pseudohexagonality
Unit cell: a = 7.494, b = 4.552, c = 10.005, β = 129.79°
Colour: Black
Diaphaneity: Opaque
Luster: Submetallic
Habit: Irregular crystallites, to 30 μm, in complexly twinned aggregates
Hardness: 5.5
Specific gravity: 4.17
Cleavage: none
Tenacity:
Streak: Black
Synonyms/varieties:
Comments: Found as a grain in micaceous V-Au-rich stringers in a hydrothermal gold deposit.
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