Nephrite Nephrite Nephrite is a variety of the calcium, magnesium, and iron-rich amphibole minerals tremolite or actinolite (aggregates of which also make up one form of asbestos). The chemical formula for nephrite is Ca(Mg, Fe)SiO(OH). 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 (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, beads, or cabochon cut gemstones.
Empire Nephrite (Fabergé egg) some Fabergé researchers were of the mistaken opinion that this egg featured a portrait medallion of Alexander III of Russia, though the original bill did not refer to a portrait of Alexander III. This mistake was result of a misinterpretation of the Moscow Armory Chamber valuables selection list. This list noted an "Egg from nephrite, on a golden base, and with portrait of the Emperor Alexander III in a medallion". Because of this, many researchers were certain that the 1902 Imperial egg featured an Alexander III portrait, though there is no evidence to support this. However, in 2015, during research