Formula: (Th,U,Ca)Ti2(O,OH)6
Origin of name: from composition (THORium, Uranium, TItanium)
Crystal system: Monoclinic, almost always metamict (amorphous due to radiation damage)
Crystal class: 2/m
Twinning:
Unit cell: a = 9.822, b = 3.824, c = 7.036, β = 118.83°
Colour: Black, brown on thin edges
Diaphaneity: Translucent
Luster: Resinous
Habit: Crystals short prismatic, to 2 cm
Hardness: 5-6
Specific gravity: 5.82
Cleavage: None
Tenacity: Conchoidal fracture
Streak: Pale brown
Synonyms/varieties:
Comments: series with brannerite. Found in microcline veins cutting a nephelene syenite
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