Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 143

6MgO,FeO,2TiO₂,3B₂O₃? TiO₂ = 23·5%.

Orthorhombic; habit prismatic, elongated.

G = 3·35-3·36. H = 3-4. Dark brown to black; pleochroic. Double refraction strong, +ve.

Edenville, New York State.