The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Amorphous.

G = 5·53. H = 5¹⁄₂-6. Dull black; opaque.

Lake Baikal, Siberia.

Warwickite.

6MgO,FeO,2TiO₂,3B₂O₃? TiO₂ = 23·5%.

Orthorhombic; habit prismatic, elongated.

G = 3·35-3·36. H = 3-4. Dark brown to black; pleochroic. Double refraction strong, +ve.

Edenville, New York State.

Weibyite.

Carbonate of E, with Ca, Sr, F, and H₂O; allied to [Bastnäsite] (q.v.). Cer = 66·96%?