Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 80

Columbate of E, Ca, Fe, Th, K, Na, etc. Near Pyrochlore (q.v.). Cer = 4-10; ZrO₂ = 0-5%.

Cubic; in dodecahedra.

G = 4·45-4·46. H = 5-6. Brown; transparent.

Schelingen, Black Forest Mountains, Germany.