Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 90
Melanocerite.
ОглавлениеVery complex fluosilicate of E and Ca, chiefly. Cer = 48; Yttr = 9·2; ThO₂ + ZrO₂ = 2%.
Rhombohedral; habit tabular.
G = 4·13. H = 5-6. Deep brown to black. Transparent.
Langesund Fiord, Norway.