Formula: (U,Ca,Ce)2(Ta,Nb)2O6(OH,F)
Origin of name: from uranium and microlite
Crystal system: Cubic/Isometric, typically metamict
Crystal class: 4/m 3 2/m
Twinning:
Unit cell: a = 10.4
Colour: Yellowish brown, greenish brown, black
Diaphaneity: Opaque, transparent in flinters
Luster: Greasy
Habit: Crystals octahedral, modified
Hardness: 5.5
Specific gravity: 5.75 to 5.88
Cleavage: None
Tenacity: (Brittle, by analogy to the pyrochlore group), Uneven/irregular fracture
Streak: Yellow
Synonyms/varieties: Djalmaite
Comments: U analogue of microlite, radioactive
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