Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 31

A variety of Uraninite (q.v.), with rare earths, Th, Pb, Fe, Ca, Si, aq., etc. Cer = 0·4; Yttr = 1·4-4·3; ThO₂ = 4·7-6·1%. Traces of ZrO₂.

Cubic, in octahedra and dodecahedra.

G = 8·7-9·0. H = 5-6. Black; translucent to opaque.

Anneröd, near Moos, Norway.