The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Amorphous, massive.

G = 4·6. H = 5¹⁄₂. Green to brown; translucent.

Bluffton, Llano Co., Texas.

Yttrocerite.

Ca₃E₂F₁₂, 1¹⁄₂H₂O. Cer = 9·3-18·2; Yttr = 8·1-29·4%.

Massive, granular.

G = 3·45. H = 4¹⁄₂. White to violet blue or brown.

Various localities in Scandinavia.

Yttrocrasite.

(Ca,Pb)O,(Th,U)O₂,3E₂O₃,16TiO₂,6H₂O. Yttr = 25·7; Cer = 2·9; ThO₂ = 8·7; TiO₂ = 49·7%.