Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 92
Molengraafite.
ОглавлениеTitano-silicate of Ca, Na, Fe, Al, Mn, etc. TiO₂ = 28%.
Monoclinic; in small prisms.
Yellow. High refraction and birefringence.
Pilandsberg, Transvaal.