The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Orthorhombic, in radial aggregates.

G = 3·571. H = 6-7. Greyish green; translucent.

Iveland, Sätersdalen, Norway.

Titanite (Sphene, Grothite).

CaSiTiO₅, with Fe´´, Mn´´. TiO₂ = 34-45% (usually 41%).

Monoclinic; wedge-shaped.

G = 3·40-3·56. H = 5-5¹⁄₂. Yellow, green, or brown; pleochroism strong; lustre resinous.

Widely distributed in Europe and N. America.

Titanium Olivine.

(H₂,Fe´´,Mg)₂(Si,Ti)O₄; Mn and F in traces. TiO₂ = 3-12%.