Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 46

2FeO,UO₂,2Y₂O₃,24TiO₂. Yttr = 14·63; TiO₂ = 55%.

Rhombic; habit prismatic.

G = 4·7. H = 5¹⁄₂-6. Black; translucent to opaque; lustrous.

Craveggia, Piedmont, Italy.