Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 87
Mackintoshite.
ОглавлениеMixture of oxides, chiefly of Th and U; also Fe, Ca, Mg, Pb, Na, B, Ta, etc. Composition very complex. ThO₂ = 45·3; E₂O₃ = 1·9; ZrO₂ = 1%.
Tetragonal, resembling thorite (q.v.).
G = 5·42. H = 51⁄2. Black; opaque.
Bluffton, Llano Co., Texas.