Second, these four kinds of jade are generally called "Four Famous Jade" in China.
1, Hetian jade mineral composition is mainly tremolite-actinolite, and contains a small amount of diopside, serpentine, graphite, magnets and other minerals, forming white, turquoise, black, yellow and other different colors, mostly monochromatic jade, a few with variegated colors. Jade is translucent and shiny after polishing.
2. dushan jade, also known as "Nanyang Jade" or "Nanyu Jade", is produced in Dushan in the north of Nanyang City. It is one of the four famous jade in China. Dushan jade is hard and dense, delicate and soft, with transparent luster and various colors. There are six kinds of pigments, including green, white, yellow, purple, red and white, and 77 kinds of colors, which are the first-class raw materials for jade carving.
3. The primary jade deposit in ancient lantian jade has not been found. The modern mining lantian jade mine is located in Hongmensi Village, Yuchuan Town, Lantian County. The ore-bearing rocks are Archean biotite schist and amphibole gneiss. Jade is fine-grained marble, mainly composed of calcite.
4. Jade is a kind of nephrite, named after Xiuyan, Liaoning Province, and belongs to serpentine. It is famous for its moist texture, delicate crystal, firm nature, good transparency and diverse colors, and has been valued and cherished by people since ancient times.
Extended data
History of lantian jade: "lantian jade" was named after it was produced in Lantian Mountain in Xi 'an.
Scholars and poets praised lantian jade many times. Many ancient books before the Tang Dynasty recorded that Lantian produced beautiful jade. When Qin Shihuang first ascended the throne, he ordered Li, the prime minister, to make an imperial edict with lantian jade, which read: Heaven decreed that he would live forever. The ancients praised: the taste of seeing is endless, and the value of hiding is priceless.
Many ancient books before and during the Tang Dynasty recorded that Lantian produced beautiful jade. A poem by Li Shangyin, a poet of the Tang Dynasty, "Men drop pearl-like tears into the moon-green sea, and the blue fields breathe their jade in the sun" made lantian jade enjoy an eternal reputation. This poem contains a touching legend. In the distant past, Taibai Venus gave Yang Boyong, a scholar who helped the poor and did good deeds, a dream: "Go in and out of Nanshan on a sunny day, and smoke hides jade." Baoyu can be found in the deep mountains of Lantian.
Lantian jade has a long mining history, but its output is low, which can't meet the social needs. With the exhaustion of ancient jade mines and the opening of the Silk Road, other jade species are used everywhere, and the exploitation and application of lantian jade are gradually lost. After the Yushan earthquake, the specific location of ancient mineral deposits was unknown, so that the Ming and Song Dynasties said in the Tiangong that Lantian was another name for Congling (Kunlun Mountain) and Lantian was a place for storing, transporting and processing jade articles.
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