nephrite

noun

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

noun

1. a tough fibrous amphibole mineral: a variety of jade consisting of calcium magnesium silicate in monoclinic crystalline form. Formula: Ca 2 Mg 5 Si 8 O 22 (OH) 2Also called: kidney stone

1. 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.