Formula: UUTi4O12(OH)2
Origin of name: from orthorhombic and brannerite
Crystal system: orthorhombic
Crystal class: 222
Twinning:
Unit cell:
Colour: black
Diaphaneity:
Luster: adamantine
Habit: crystals prismatic, to 12 mm, prisms striated
Hardness: 5 to 5.5
Specific gravity: 5.46
Cleavage: none
Tenacity:
Streak: black
Synonyms/varieties:
Comments: dimorphous with brannerite
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