The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Pseudo-cubic.

G = 4·2. H = 5¹⁄₂. Grey; opaque; lustre metallic.

Alnö, Sweden.

Kochelite.

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.

Koppite.

Columbate of E, Ca, Fe, Th, K, Na, etc. Near [Pyrochlore] (q.v.). Cer = 4-10; ZrO₂ = 0-5%.