Nephrite is a variety of the calcium, magnesium, and iron-rich amphibole (aggregates of which also make up one form of asbestos 2(Mg It is one of two different mineral species called jade , which is a variety of pyroxene. While nephrite jade possesses mainly grays and greens (and occasionally yellows, browns or whites), jadeite jade, which is rarer, can also contain blacks, reds, pinks and violets. Nephrite jade is an ornamental stone used in carvings , or cabochon cut gemstones. Nephrite is also the official state mineral of Wyoming.
Nephrite can be found in a translucent white to very light yellow form which is known in China as mutton fat jade, in an opaque white to very light brown or gray which is known as chicken bone jade, as well as in a variety of green colors. Western Canada nephrite. Nephrite jade was used mostly in pre-1800 China , the Pacific Coast and Atlantic Coasts of North America, Neolithic Europe, and southeast Asia.