The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Monoclinic.

As Allanite.

Boden, near Marienburg.

Britholite.

A basic phosphosilicate of cerium metals, with Fe, Ca, Mg, Na, F. Cer = 60·5-60·9%.

Hexagonal; habit prismatic.

G = 4·446. H = 5¹⁄₂. Brown; transparent.

Naujakasik, Greenland.

Bröggerite.

A variety of [Uraninite] (q.v.), with rare earths, Th, Pb, Fe, Ca, Si, aq., etc. Cer = 0·4; Yttr = 1·4-4·3; ThO₂ = 4·7-6·1%. Traces of ZrO₂.