Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 151

nCaF₂ + mYF₃ in isomorphous mixture? Yttr = 20-25; Cer = 1-2%.

Cubic.

G = 3·54-3·56. H = 4¹⁄₂. Closely resembles fluorspar, except in badness of cleavage.

Northern Norway.