Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 117

An yttria columbate, near Fergusonite, but with no U and considerable TiO₂; Yttr = 37; Cer = 2·9-4·0; TiO₂ = 6·5%.

No data yet determined. Isotropic.

G = 4·179. H = 5¹⁄₂. Yellowish brown.

Norway.