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Formula: Ca2[(UO2)4O4(SO4)2](H2O)8
Sulphate, uranyl mineral
Crystal System: Triclinic
Specific gravity: 4.325 calculated
Hardness: 3
Streak: White
Colour: Bright to amber yellow
Luminescence: Fluoresces pale yellow under short wave and long wave UV
Environments
Sedimentary environments
Hydrothermal environments
Rabejacite is a rare secondary mineral in the oxidation
zone of uranium deposits, formed by alteration of
uraninite. Associated minerals include
gypsum, johannite and
uraninite
(HOM).
Localities
At the type locality, Rabejac Est, Le Puech, Lodève, Hérault, Occitanie, France, rabejacite occurs as bright
to amber-yellow acicular crystals, flattened tablets to 0.1 mm, or rounded nodules to 0.3 mm; it is associated with
gypsum and secondary
uranium minerals derived by alteration of
pitchblende
(AM 79.570-574).
Rabejacite from Rabejac Est - Image
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