Nephrite "hei-tiki" (neck pendant). These are believed to have their own "mana", are handed down as valuable heirlooms, and often given as gifts to seal important agreements. It has also been used for a range of tools such as adzes, as Māori had no metal tools before European contact. Commonly called "greenstone", jade jewellery in Māori designs is widely popular with tourists. Stone is often imported from Canada, China and Siberia, and Ngai Tahu runs a pounamu certification scheme to verify the authenticity of New Zealand stone. Nephrite Nephrite is a variety of the calcium, magnesium, and iron-rich amphibole minerals tremolite
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