Formula: (U,Y)(Ti,Nb)2O6
Origin of name: from uranium and polycrase
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 14.51, b = 5.558, c = 5.173
Colour: Brown-red
Diaphaneity: Opaque
Luster: Adamantine
Habit: Euhedral elongate crystals to 0.15 mm
Hardness: 5-6
Specific gravity:
Cleavage: 1; {100} good
Tenacity:
Streak: Brownish
Synonyms/varieties:
Comments: U analogue of polycrase, almost totally metamict
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