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Formula: Cu2+(UO2)3(Se4+O3)2O2.8H2O
Selenite, uranyl mineral
Specific gravity: 4.44
Hardness: 6
Colour: Greenish brown, yellow-green
Luminescence: Not fluorescent
Solubility: Soluble in 1:1 nitric acid and in dilute hydrochloric acid (Dana)
RADIOACTIVE
Environments
Marthozite occurs in cavities in selenian
digenite. It dehydrates in air to a meta phase (Webmin).
Localities
At the type locality, the Musonoi Mine, Kolwezi, Kolwezi mining district, Lualaba, DR Congo, marthozite occurs
as a rare alteration product of selenian
digenite in the zone of oxidation of the
uranium-bearing
copper-cobalt hydrothermal ore
deposit. From this deposit the selenites
guilleminite and
demesmaekerite have been described, as well as
denningite, kasolite,
cuprosklodowskite,
uranophane-α,
malachite, chalcomenite and
sengierite
(AM 55.533, HOM).
Marthozite from the Musonoi mine - Image
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