The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Orthorhombic; usually massive.

G = 5·6-5·8. H = 5-6. Deep velvet black; opaque.

Miask; Urals; Mitchell Co., N. Carolina.

Schorlomite.

A titaniferous Garnet—3CaO,(Fe,Ti)₂O₃,3(Si,Ti)O₂. TiO₂ = 12·5-22%.

Cubic; usually massive.

G = 3·81-3·88. H = 7-7¹⁄₂. Black; transparent in flakes.

Magnet Cove, Arkansas.

Senaite.

(Fe,Mn,Pb)O,TiO₂, cf. [Ilmenite]. TiO₂ = 49-52%.