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Formula: Fe2+(UO2 )2(SO4)2(OH)2.7H2O
or
Fe2+(U6+O2 )2(SO4)2(OH)2.7H2O
Hydrated sulphate, uranyl mineral
Crystal System: Orthorhombic
Specific gravity: 3.268 measured, 3.31 calculated for the empirical formula, 3.26 calculated for the ideal formula
Hardness: 2
Streak: White
Colour: Pale yellow to greyish white
Luminescence: Not fluorescent under UV
Solubility: Readily soluble in dilute hydrochloric acid
RADIOACTIVE
Environments
Localities
At the type locality, Mas d'Alary village, Lodève, Lodève, Hérault, Occitanie, France, deliensite occurs as
pale yellow to greyish white microtabular crystals arranged in spherical aggregates up to 4 mm in diameter. The
crystals have a mean length of 0.35 mm and a width of 0.06-0.15 mm. They are transparent to translucent, with a
vitreous lustre. Deliensite was found in the oxidation zone of the
uranium deposit, in close association with
uraninite, gypsum and granular
pyrite. It originates from the alteration of
uraninite and
primary sulphides, with a contribution from the host rocks
(CM 35.4.1021-1025).
Deliensite from Mas d'Alary - Image
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