The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Cubic, in octahedra and dodecahedra. Cubic cleavage.

G = 4·15. Brown; transparent.

Near Sea of Azov, Russia.

Benitoite.

A Titano-silicate of barium, BaTiSi₃O₉. TiO₂ = 20·1%.

Rhombohedral.

H = 6¹⁄₂-7. Colourless to blue; transparent; pleochroism strong.

Source of San Benito River, California.

Blomstrandine.

Dimorphous with [Polycrase] (q.v.), and of same composition.