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
The First Series of Standardized Forms of Words with Non-standardized Variant Forms only three times in the "People's Daily" between 1995 and 2000. The Ministry of Education of the People's Republic of China has called on teachers throughout China to use and teach the forms recommended in "The First Series of Standardized Forms of Words with Non-standardized Variant Forms". Before March 31, 2005, a student's use of one of the variant written forms not recommended in the "First Series" on a test like Gaokao would not influence points earned on a given question. Implementation of the Ministry's policy is not to influence the usage of variant written forms in research on ancient