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Formula: Y2O4(UO2)4(CO3)3.14H2O
Hydrated uranyl carbonate,
yttrium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.93
Colour: Yellow, bright yellow. Dehydration causes the crystals to become opaque and the colour becomes
less intense
(Lauf2)
Luminescence: Non-fluorescent
Solubility: Effervesces strongly in dilute hydrochloric acid
Common impurities: Nd,Sm,Gd,Dy
RADIOACTIVE
Environments
Kamotoite-(Y) is a rare supergene product of
uraninite hydration–oxidation weathering
(MM 81.653-660).
Associated minerals include pale yellow rosettes of shabaite-(Nd),
minute acicular crystals and spherical nodules of uranophane, blue
rosettes of astrocyanite-(Ce) and transparent blue-green crystals
of schuilingite-(Nd)
(Lauf2).
Localities
At the type locality, the Kamoto East Open Cut, Kamoto, Kolwezi mining district, Lualaba, DR Congo,
kamotoite-(Y)
occurs in the copper-cobalt deposit
as crusts of elongate bright yellow blades to 5 mm long on uraninite
(AM 73.191).
Kamotoite-(Y) from Kamoto - Image
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