Marthozite

marthozite

guilleminite

demesmaekerite

cuprosklodowskite

Images

Formula: Cu2+(UO2)3(Se4+O3)2O2.8H2O
Selenite
Specific gravity: 4.44
Hardness: 6
Colour: Greenish brown, yellow-green
Solubility: Soluble in 1:1 nitric acid and in dilute hydrochloric acid (Dana)
RADIOACTIVE
Environments

Hydrothermal 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).

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