Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 79

A columbate of E, Fe, Zr; with ThO₂, SiO₂, Ca, aq., etc. Allied to Fergusonite (q.v.). Yttr = 17·22; ZrO₂ = 12·8; ThO₂ = 1·23%.

Doubtful; may be tetragonal.

G = 3·74. H = 3-3¹⁄₂. Brown to honey yellow; translucent.

The Kochelweise, near Schreiberhau, Silesia.