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Formula: Cu4(UO2)(Se4+O3)2(OH)6
Uranyl selenite (mineral
containing an (SeO3)2- group)
Crystal System: Orthorhombic
Specific gravity: 4.61 calculated
Colour: Clear green
Luminescence: Not fluorescent
RADIOACTIVE
Environments
Localities
At the type locality, the Musonoi mine, Kolwezi, Kolwezi mining district, Lualaba, DR Congo, derriksite occurs
as euhedral green to bottle-green crystals not exceeding 0.7 mm in size. It has been found in a very small amount in
the oxidation zone of the
copper-cobalt
deposit, as microcrystalline crusts on selenian
digenite, also associated with the
selenites blue
chalcomenite, acicular yellow
guilleminite, green to yellow
marthozite and dark green
demesmaekerite on
malachite
(AM 57.1912-1913, Lauf2).
Derriksite is an alteration product of primary
uraninite and selenian
digenite
(Lauf2).
Derriksite from the Musonoi mine - Image
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