The English name of nephrite is Nephrite, and sometimes Jade is also used. Chinese name nephrite or Hetian jade. Nephrite is a collection of tremolite and actinolite minerals formed during the geological process and reaching the jade level. The world's nephrite has more production areas, but the history of nephrite produced in Hetian County, Xinjiang, China has the longest history and the best quality. Foreign geologists refer to nephrite as Chinese jade. The color of nephrite depends on the mineral color that makes up the nephrite. The iron-free tremolite is white or light gray; the iron-containing tremolite is pale green. The actinolite is green, yellowish green and brownish green. The graphite is grayish black and the magnetite is black. Nephrite has different mineral compositions and different colors. Xinjiang Hetian jade mainly has white, blue-white, dark green, and gray. The biggest feature is that the color is uniform except for the green jasper. How to identify --- delicate texture The most characteristic feature of nephrite recognition is the delicate texture. It is slippery when touched by hand. It is lustrous, soft, soft, uniform in color, smooth and creamy, slightly transparent, tough and not easily broken. On the polishing surface (jade), a visible striate-like structure (fiber interlaced structure) is generally seen, which is generally in the form of a felt, a tuft or a bundle. White jade is one of the soft jade varieties. Its appearance is mainly white, with colors such as suet white, pear white, snow white, ivory white, white fish and fish bone white, including more than 94% of tremolite. About 2% of the erectite stone and 2% of the attapulgite have an interwoven felt structure. The texture is fine, the luster is moist, such as the sheep fat called the sheep fat jade, is the "white jade crown" or "soft jade king", the number is rare, rarely seen. The glossiness of the sheep fat jade is called white jade, which is also the top grade in nephrite. It is mostly used for jewelry or ornaments. The difference between nephrite and other jade The difference between nephrite and other jade is firstly the hardness. The hardness of jadeite is 6.5~7. It is difficult to leave jade on the emerald with quartz. The nephrite is 6~6.5, which is used on the flat jade surface. Quartz scoring can leave a dent; serpentine jade is 2.5~5.5, and it can be scored with a knife to leave a dent. The marble is 3.5, which is smaller than the hardness of the knife; the quartz jade is scratched with quartz. Secondly, the density is also different. Jadeite (3.25~3.34g/cm3) is suspended in diiodomethane and quickly sinks in tribromomethane. Nephrite (2.9~3.1g/cm3), serpentine jade (2.44~2.58g/cm3), marble (2.65~2.75g/cm3) and quartz jade (2.7g/cm3) in diiodomethane and tribromomethane Except that nephrite floats or sinks in the latter, the others are floating. Finally, in terms of structure and gloss, the difference between nephrite and jade is that the gloss and transparency of the former are higher than that of soft jade, and there is a “oily†translucent feeling like a layer of vegetable oil. The main difference is that the variegated interwoven structure of jadeite and the felt-like interweaving structure of nephrite are completely different. The jade phenocrysts are transparent mineral crystals with large particles, and the "fibers" surrounding them are translucent, forming a grid like the middle space, and no transparent porphy is visible in the nephrite. Nephrite is opaque due to the interweaving of fibrous minerals into sparsely colored spots. The serpentine jade is distinguished from the nephrite by the characteristic translucent yellow-green color, and the serpentine jade has a poor gloss and is waxy. Evaluation of nephrite: three good plus one degree At present, the process requirements and economic evaluation basis of nephrite raw materials in the Chinese arts and crafts industry and the jewelry industry can be summarized as three good ones. That is, the texture is good, the color is good, the gloss is good, and there is a certain degree of blockiness. The texture is good, the soft jade raw material is required to be tough, fine and flawless; the color is good, and the color is required to be bright and pure without variegation; the gloss is required to reach the gloss and bright without porcelain; the degree is required to have a certain degree, or a certain weight . Cotton Single Jersey Fabric,Stripe Jersey Fabric,Sweater Single Jersey Fabric,Single Jersey Nylon Fabric Shaoxing Chunyi Modern Textile Co.,Ltd , https://www.chunyibd.com