Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 156
Zirkelite.
Оглавление(Ca,Fe)(Zr,Ti,Th)₂O₅, with E, U, Mg, etc. ZrO₂ = 48·9-52·9; ThO₂ = 0-7·3; TiO₂ = 14-15; E₂O₃ = 0-3%.
Cubic; in twinned octahedra.
G = 4·7. H = 5. Black; transparent in thin flakes.
Jacupiranga, São Paulo, Brazil.