Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 134
Thortveitite.
ОглавлениеE₂O₃,2SiO₂, with Fe´´´, Al, Mn´´´ traces; E = chiefly Sc. Yttr = 54·5%.
Orthorhombic, in radial aggregates.
G = 3·571. H = 6-7. Greyish green; translucent.
Iveland, Sätersdalen, Norway.