Formula: Pb2(UO2)3O2(PO4)2 . 5H2O
Origin of name: For A. Dumont, Belgian geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 8.16 Å, b = 16.73 Å, c = 7.02 Å, b = 110°
Colour: Pale yellow to golden yellow
Diaphaneity:
Luster:
Habit: Crystals elongated on c-axis, flattened, striated parallel to c-axis, minute
Hardness:
Specific gravity: 5.65
Cleavage: None
Tenacity:
Streak: Pale yellow
Synonyms/varieties:
Comments: Fluoresces weak green
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