Simple substance is a pure substance composed of the same elements, and diamond is one of them. Diamond, commonly known as Jin Gangzuan, also known as rough diamond, is a mineral composed of carbon, which is an allotrope of carbon. Diamond is a simple substance, and it is the hardest substance naturally existing in nature.

Diamond is a simple crystal composed of carbon element formed in the deep part of the earth under high pressure and high temperature, which refers to polished diamond. Diamond is a colorless octahedral crystal, composed of pure carbon, which is connected by carbon atoms with tetravalent bonds. Because the C-C bond in diamond is very strong, all valence electrons participate in the formation of valence bonds, and there are no free electrons, so the hardness of diamond is very high, the melting point is 6900 degrees Fahrenheit, and the ignition point of diamond in pure oxygen is 720 ~ 800 degrees Celsius.

The main producing areas of diamonds

According to the data of 1987, the main diamond metallogenic area in China is from Liaodong to Jinan, and there are two stages of kimberlite in Mesozoic and Mesozoic. Western Shandong, northern Jiangsu and northern Anhui are metallogenic areas, and there may be multi-stage kimberlites in the Lower Paleozoic. Kimberlite has been found in Taihang Mountain, Songshan Mountain and Wutai Mountain in Shanxi, Henan and Hebei mining areas. Hunan, Guizhou, Hubei and Sichuan metallogenic areas and four diamond placers with industrial value have been discovered in Yuanshui Valley, Hunan Province.

Hunan diamonds are produced in Dingjiagang, Taoyuan and Qianyang in Changde, Hunan. Hunan diamonds are mainly placers, mainly distributed in Yuanshui River Basin, with scattered distribution and low grade, but good quality, with gem-grade diamonds accounting for about 40%. According to legend, during the Ming Dynasty, sporadic diamond discoveries were made in Yuanjiang Valley, Hunan Province, and large-scale prospecting began in the 1950s.

Baidu Encyclopedia-Diamonds