Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 41

A variety of Uraninite (q.v.) rich in rare earths and helium. Cer = 2·3-2·9; Yttr = 10·0-10·3; ThO₂ = 4·6-4·8%.

Cubic; usually massive.

G = 7·49. H = 5¹⁄₂. Black; opaque.

Arendal, Norway.