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Nephrite is a variety of the calcium, magnesium, and iron-rich amphibole minerals tremolite or actinolite . The chemical formula for nephrite is Ca25Si8O222.[1] It is one of two different mineral species called jade. The other mineral species known as jade is jadeite, which is a variety of pyroxene. While nephrite jade possesses mainly grays and greens , jadeite jade, which is rarer, can also contain blacks, reds, pinks and violets. Nephrite jade is an ornamental stone used in carvings, beads, or cabochon cut gemstones. Nephrite is also the official state mineral of Wyoming.