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.
Two Rock , north-northeast of Fairy Castle on the slope leading to Three Rock. Two Rock can be reached via the Coillte-owned forest recreation areas of Ticknock, Kilmashogue and Tibradden, which are managed by the Dublin Mountains Partnership. The mountain is traversed by the Dublin Mountains Way hiking trail that runs between Shankill and Tallaght while the Wicklow Way hiking trail runs to the west of the summit. Two Rock Two Rock (; archaic: Black Mountain; "" ()) is a mountain in Dún Laoghaire–Rathdown, Ireland. It is high and is the 382nd highest mountain in Ireland. It is the highest point of