Formula: UO4.4H2O
Origin of name: for F. Studt, Belgian geologist
Crystal system: monoclinic
Crystal class: 2
Twinning:
Unit cell: a = 11.85 Å, b = 6.79 Å, c = 4.25 Å, b = 93.6°
Colour: whitish yellow to yellow
Diaphaneity:
Luster:
Habit: crystals acicular, to 4 mm, thin crusts, radial aggregates
Hardness:
Specific gravity: 3.64
Cleavage: none
Tenacity: fibers flexible
Streak:
Synonyms/varieties:
Comments:
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