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E(CbO₃)₃,E₂(TiO₃)₃,1¹⁄₂H₂O; with U and Zr. Cer = 2·3-8·4; Yttr = 13·2-34·6; TiO₂ = 20-23%. ThO₂ + ZrO₂ usually in traces.

Orthorhombic; usually massive.

G = 4·6-5·0. H = 6¹⁄₂. Brownish-black; translucent to opaque.

Hitterö, Brevig, Jolster, Arendal, Norway; Cooglegong, Australia; N. Carolina.