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 Forms of cricket Cricket is a multi-faceted sport with multiple formats, depending on the standard of play, the desired level of formality, and the time available. One of the main differences is between matches limited by time in which the teams have two innings apiece, and those limited by number of overs in which they have a single innings each. The former, known as first-class cricket if played at the senior level, has a scheduled duration of three to five days (there have been examples of "timeless" matches too); the latter, known as limited overs cricket because each team bowls