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
Forms of cricket is often seen as "old-fashioned" and is typically used for friendly matches rather than in organised league play. Cricket is also played in several different shortened forms, designed to pack as much action as possible into an hour or two, enabling them to be played as a single contest in an evening, or as a series of multiple contests between different teams that cover the entire day. Such forms have evolved since the 1980s, and take cricket an additional step beyond one-day cricket. Most forms will resemble twenty-twenty cricket in nature, although shorter formats with reduced numbers of players, typically