nephrite -
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
amphibole a mineral or mineral variety belonging to the amphibole group
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Wiktionary
Substantiv
nephrite -
A semi-precious stone, one of the two types of stone commonly referred to as jade, the other being jadeite.
Wikipedia
Nephrite is a variety of the calcium and magnesium-rich amphibole mineral actinolite (aggregates of which also make up one form of asbestos). The chemical formula for nephrite is Ca25Si8O222. It is one of two different mineral species called jade.
