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Silicate of Zr and E, with Ca, Mg, Be, Al, Cu, Zn, and aq. in small quantities. Cer → 3·98; Yttr → 22; ZrO₂ = 30·5-61·4%.

Tetragonal; optically isotropic. Pseudomorphous after zircon.

G = 3·3-4·3. H = 5-6. Yellowish brown; transparent.

Ytterby, Sweden; Arendal, Norway; various localities in N. America.