Nephrite

[nefrait]

Definition

(noun.) an amphibole mineral consisting of calcium magnesium silicate in monoclinic crystalline form; a source of jade that is less valuable than from jadeite; once believed to cure kidney disorders.

Checked by Antoine--From WordNet

Definition

(n.) A hard compact mineral, of a dark green color, formerly worn as a remedy for diseases of the kidneys, whence its name; kidney stone; a kind of jade. See Jade.

Editor: Maynard