Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 50

R´´Cb₂O₆(OH)₂ + R´´SiO₃ (cf. Chalcolamprite). E₂O₃ = 4·43; ZrO₂ = 3·78%.

Cubic.

G = 3·44. H = 4. Dark chocolate-brown; transparent.

Narsarsuk, Greenland.