Coral And nephrite knowledge

What is a coral
Coral jewelry grows in the sea by a low-level coelenterate coral calcareous secreted out of a pile of large, often isolated dendrites, the cross section with concentric layered pattern. Its chemical composition is calcium carbonate, mainly in the form of calcite, hardness of 3.5-4, specific gravity 2.60-2.70. No acid. Coral mainly of red, white, green, purple and other color, in which the color for the top grade authentic red coral. Qing Dynasty, one of the second official Dingdai are made of red coral. Firm texture and delicate coral flexible, can be used to carvings or inlaid jewelry, can be used as medicine. In Asia, the main origin of coral in the sea on a line in Japan to Taiwan, Hainan Island and the Paracel Islands also produced.


And nephrite Tips

Name hetian jade original writing in English ", and Tian Yu." Xinjiang's Hotan - Oda area is the most important and famous soft jade-producing areas. There are five known mineral points: Wada mining point of Montenegro, including the rich son of Jade Dragon Kashgar River (productive white) and Karakash River (productive Moyu); Yutian County Elamasi jade mine, is the famous Hill visited Qi Liu Yu-producing pit, where wealthy pit; there skin Hill County Karakash River upstream and Kara West and other big slope. Jade produced in these places were called, and nephrite. In addition, and nephrite jade are often used as Kunlun, Xinjiang jade even synonymous.