Formula: Al(UO2)3(PO4)2O(OH).7H2O
Origin of name: combination of elements present (U, P, Al)
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: By reflection on {001}, universal
Unit cell: a = 13.704, b = 16.82, c = 9.332, β = 111.5°
Colour: Amber-yellow, brownish yellow
Diaphaneity: Transparent
Luster:
Habit: crystals acicular to fibrous, poorly terminated, to 0.3 mm
Hardness: 3
Specific gravity: 3.5
Cleavage: 1; {010} distinct
Tenacity:
Streak: Light yellow
Synonyms/varieties:
Comments: Radioactive
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