Mineralogy. a compact or fibrous variety of actinolite, varying from whitish to dark green: a form of jade.

1785–95; < German Nephrit. See nephr-, -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nephrite (ˈnɛfraɪt)
Also called: kidney stone a tough fibrous amphibole mineral: a variety of jade consisting of calcium magnesium silicate in monoclinic crystalline form. Formula: Ca2Mg5Si8O22(OH)2
[C18: via German Nephrit from Greek nephrós kidney, so called because it was thought to be beneficial in kidney disorders]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
nephrite   (něf'rīt')  Pronunciation Key 
A green to blue variety of jade. Nephrite is an amphibole and is the least precious form of jade. Chemical formula: Ca2(Mg,Fe)5Si8O22(OH)2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Jade can consist of two different minerals-nephrite and jadeite.
The weapon is afterward heated and the surface polished with nephrite.
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