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Phosphate of E, with ThO₂, SiO₂, Zr, etc. Cer = 0-11; Yttr = 54·1-64·7; ThO₂ = 1-5%.

Tetragonal; isomorphous with Zircon?

G = 4·45-4·56. H = 4-5. Brown to yellow; opaque.

Diamond sands of Brazil; Norway.