Nephrite Greek "λίθος νεφριτικός"; "νεφρός λίθος", which means 'kidney stone' and is the Latin and Greek version of the Spanish "piedra de ijada" (the origin of "jade" and "jadeite"). Accordingly, nephrite jade was once believed to be a cure for kidney stones. Besides the terms already mentioned, nephrite has the following synonyms and varieties: "aotea", "axe-stone", "B.C. jade", "beilstein", "kidney stone", "lapis nephriticus", "nephrit", "nephrita", pounamu, "New Zealand greenstone", "New Zealand jade", "spinach jade" (dark grayish green), and "talcum nephriticus". "Tomb jade" or "grave jade" are names given to ancient burial nephrite pieces that have a brown or chalky white texture
Ornamental turning of ornamental turning and to restore, maintain and use the old equipment or, to adapt modern lathes for ornamental turning. Some are even bringing the hobby right up-to-date by building computer-controlled O.T. lathes. The accepted definitive published work on ornamental turning is the book "Turning and Mechanical Manipulation", by Charles and John Jacob Holtzapffel. Volume 5, entitled “The Principles and Practice of Ornamental or Complex Turning” is considered to be the "bible" of ornamental turning but there is much related information in the other volumes. Other useful books include: "Ornamental Turning", by J.H.Evans, "The Lathe & Its Uses", by J