Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 68

Hjelmite (Hielmite).

Оглавление

A stanno-tantalate of Ca, Mn, Fe, E, related to Yttrotantalite (q.v.). E₂O₃ = 1-6%.

Orthorhombic.

G = 5·82. H = 5. Black; lustre metallic.

Fahlun, Sweden.

The Rare Earths: Their Occurrence, Chemistry, and Technology

Подняться наверх