Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 109

Dimorphous with Euxenite (q.v.).

Orthorhombic; isomorphous with Blomstrandine.

G = 4·6-5·0. H = 6. Black; transparent in flakes.

Swaziland, S. Africa.