The Rare Earths: Their Occurrence, Chemistry, and Technology

by Stanley Isaac Levy

Monoclinic. Habit prismatic.

G = 3·23. H = 5¹⁄₂. Black, red in flakes. Translucent to opaque.

Narsarsuk, Greenland.

Nivenite.

A variety of [Cleveite] (q.v.), readily soluble in dilute acids.

Cubic; crystallisation indistinct.

G = 8·01. H = 5¹⁄₂. Velvet black; opaque.

Bluffton, Llano Co., Texas.

Nohlite.

A variety of [Samarskite] (q.v.) containing water (→ 4·6%).