Deliensite

deliensite

uraninite

gypsum

pyrite

Images

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

Hydrothermal 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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