Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 19

Titano-silicate of Fe, Al, Mn, Zr, K, Na, with aq. ZrO₂ = 1·2-4·5; TiO₂ = 7-14%.

Rhombic. Cleavage (010) perfect.

G = 3·2-3·4. H = 3. Golden to bronze yellow; strongly pleochroic.

Brevik, Norway; El Caso Co., Colorado; Greenland.