Formula: Pb(UO2)(SiO4).H2O
Nesosilicate (insular SiO4 groups)
Specific gravity: 5.83 to 6.5
Hardness: 4 to 5
Streak: Pale yellow brown
Colour: Ochre yellow to brownish yellow, amber brown, lemon yellow, green or reddish orange
Solubility: Gelatinises in acids
Common impurities: As,P,Ba,Fe,Mg,Ca

Sedimentary environments
Hydrothermal environments

Kasolite occurs as an oxidation product of uraninite associated with other secondary minerals of uranium (Dana).


At the Nabarlek mine, West Arnhem Region, Northern Territory, Australia, kasolite is associated with rutherfordine, sklodowskite and curite (HOM).

At the Nicholson No. 1 mine, Consolidated Nicholson Mines, Goldfields District, Beaverlodge Lake area, Saskatchewan, Canada, kasolite has been found as orange yellow crusts in association with an unidentified yellow-green radioactive mineral in fractures near the centre of radioactivity. Both minerals are colloform and kasolite appears to be the later of the two (AM 36.411-444).

At the type locality, the Shinkolobwe mine, Shinkolobwe, Kambove District, Haut-Katanga, DR Congo, kasolite occurs as radiating needles, crystalline granular, and compact-massive material in the oxidation zone of the uranium deposit (Mindat). Associated minerals include uraninite, torbernite, curite and dewindtite (AM 7.128-129, HOM).

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