Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 54

An altered Thorite (q.v.) containing E, Ca, Fe, Mn, Na, Ti, H₂O, etc. Cer = 14; Yttr = 5·9; ThO₂ = 36·0; ZrO₂ = 0·6%.

Rhombic (Paijkull). Amorphous, isotropic (Brögger).

G = 4·39. H = 4¹⁄₂-5. Brownish black; opaque.

Near Brevig, Norway.