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PbO,UO₃,ThO₂,2SiO₂,2H₂0 + 2aq. ThO₂ = 31·3%. Cer and Yttr—traces.

Amorphous.

G = 4·4-4·7. H = 2¹⁄₂-3. Bright yellow; opaque.

Pilbara goldfields, West Australia.