Specific gravity: 4.03
Sulphate-rich acid waters produced by oxidation of sulphide minerals enhance uranium mobility around uranium
ores and uranium-bearing radioactive waste. Upon evaporation, several
secondary uranyl minerals, including many uranyl sulphates such
as marécottite precipitate from these waters
At the Musonoi Mine, Kolwezi, Kolwezi mining district, Lualaba, DR Congo, marécottite is a rare alteration product of selenium-bearing digenite in the oxidation zone of a uranium-bearing copper-cobalt hydrothermal ore deposit. Associated minerals include digenite, demesmaekerite, denningite and guilleminite (HOM).
At Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, magnesiozippeite and marécottite co-exist, sometimes in the same sample (AM 88.676-685).
At the type locality, La Creusa U prospect, La Creusaz, Les Marécottes, Salvan, Saint-Maurice, Valais, Switzerland, marécottite occurs as diamond shaped platelets to 500 µm in length grouped into rosettes in hydrothermal breccia veins. It is an alteration product of uraninite and associated with uraninite, gypsum, rabejacite, johannite and some other uranium species, such as magnesiozippeite (Minrec 35.4.358, AM 88.676-685).
At the Lucky Strike No. 2 Mine, San Rafael Mining District, Emery county, Utah, USA, magnesiozippeite and marécottite co-exist, sometimes in the same sample (AM 88.676-685).
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