Formula: Bi(UO2)O2(OH)
Oxide, uranyl and bismuth-bearing
mineral
Crystal System: Monoclinic
Specific gravity: 6.36 measured, 7.731 calculated
Hardness: 2 to 3
Streak: Light orange
Colour: Yellow-orange, reddish orange, brick red
RADIOACTIVE
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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