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Formula: (Fe3+,Mg)xPb2+8.6(UO2)36O36(OH)24.41H2O
It has been suggested that the correct formula should be
(Fe,Mg)0.5Pb4.5(U5+(UO2)17O18(OH)14](H2O)~19.5
reflecting the presence of rare pentavalent uranium U5+, that is also present in
wyartite, shinkolobweite
and nollmotzite
(Mindat).
Uranyl hydroxide
Crystal System: Triclinic
Specific gravity: 6.194 calculated
Hardness: 3½
Colour: Coffee-brown to black, green
RADIOACTIVE
Environments
Sedimentary environments
Hydrothermal environments
Localities
At Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, richetite is associated with
metazeunerite, nováčekite,
zeunerite, antlerite and
langite
(HOM).
At the type locality, the Shinkolobwe Mine, Shinkolobwe, Kambove Territory, Haut-Katanga, DR Congo, richetite
occurs as a secondary mineral in the oxidised zone of the
uranium deposit, associated with
uraninite, uranophane,
becquerelite, masuyite,
torbernite, kasolite,
rutherfordine and
wölsendorfite
(Mindat, HOM).
Richetite from Shinkolobwe - Image
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