Almost all parts of the world have the origin of crystals, mainly in pegmatite veins or caves. The famous crystal producing areas are mainly Minas, Gila, Madagascar, Alps, Arkansas and Urals in Russia. The largest single crystal in the world is produced in Brazil, with a length of 5.5m, a width of 2.5m and a weight of over 40 tons. The world's largest high-quality crystal ball, with a diameter of 2 1cm and a weight of 107 lb, is made in Myanmar. The whole ball is pure and clear as water, and now it is in the Smithsonian Museum in Washington, USA. Every province in China has crystal mineral resources. Donghai County, Jiangsu Province is known as the "hometown of crystals". 1958 made a China "Crystal King" with a length of 1.7m, a width of 1.2m and a weight of 3.5t Its output accounts for 50% of the country, and it has the largest crystal market in the country. The Crystal Festival is held every two years. In addition, Hainan (Yangjiaoling, with an area of only 0.2km2 and a depth of 150m, producing nearly 100 tons of piezoelectric crystals and other crystals), Guangdong, Guangxi and Sichuan are also important producing areas. Liaoning is famous for producing jade and olivine.