Formula: Ca(UO2)2(PO4)2 . 2 - 6H2O
Origin of name: From Greek for lower (hydration) and autunite
Crystal system: Tetragonal
Crystal class: 422
Twinning:
Unit cell: a = 6.551 Å, c = 8.164 Å
Colour: Lemon-yellow, greenish yellow to yellowish green
Diaphaneity:
Luster: Pearly to dull
Habit: Same as Autunite
Hardness: 2 to 2.5
Specific gravity: 3.45 to 3.55
Cleavage: 2; {001} perfect, {100} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Fluoresces pale yellowish green
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