Uranosphaerite

minerals

uranospinite

uraninite

zeunerite

Formula: Bi(UO2)O2(OH)
Oxide
Specific gravity: 6.36
Hardness: 2 to 3
Streak: Light orange
Colour: Yellow-orange, reddish orange, brick red
RADIOACTIVE
Environments

Hydrothermal environments

Uranosphaerite forms from the alteration of uraninite (Webmin).

Localities

At Kerségalec, Lignol, Morbihan, Brittany, France, uranosphaerite occurs with uraninite, wölsendorfite and renardite (HOM).

At the type locality, the Walpurgis Flacher vein, Weißer Hirsch Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany, uranosphaerite is an oxidation product of uraninite in a cobalt - nickel - bismuth bearing hydrothermal vein, associated with walpurgite, uranospinite, uranospathite, asselbornite, trögerite, zeunerite, erythrite and cobalt oxides (Dana, HOM).

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