Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 115
Rhönite.
Оглавление(Na,K,H)₃Ca₃(Fe´´,Mg)₁₅(Al,Fe´´´)₁₆(Si,Ti)₂₁O₉₀. TiO₂ = 9·5%.
Anorthic, isomorphous with Aenigmatite.
G = 3·5-4·3. Brown, with strong pleochroism.
Rhön Mountains, Saxony.
