Identification of auctions and nephrite

And nephrite (Nephrite) is a soft jade, commonly known as true jade, especially the traditional concept produced Hotan jade and nephrite is the leading brand of high-end with a nephrite [1], the new national standard refers to the hardness of 6.0 6.5 jade name [2]. Yu told a narrow sense, generally refers to Hetian [3]. And nephrite itself is not a geographical concept, not specific Hotan jade produced, but a kind of product name. Of the tremolite component accounted for more than 98% of the stones are named and nephrite, also known as soft jade, tremolite, tremolite plus nephrite, and nephrite tremolite plus. In a narrow sense of jade, generally refers to Hetian. Chemical composition is an aqueous calcium magnesium silicate, a chemical formula Ca: Mgs (OH) z (Si4011) 2. Hardness of 6 to 6.5, a density of 2.95-3.17. Hubei Hetian jade and turquoise, jade Nanyang in Henan and Liaoning Xiuyan and known as China's four famous jade. Hetian is divided into: (1) white: the bluish white color, delicate, moist, slightly transparent, like suet who said white jade; opaque, with poor luster is white. (2) jade and green jade: dark gray color is green to blue-green, opaque; green jade is a transitional type between Sapphire and white, grayish green. (3) Jasper: dark green (spinach green), coarse texture. In addition to the production of jade in Xinjiang, the country jade craft circles Taiwan and abroad by the middle of nephrite also collectively referred to as jasper. (4) Black Jade: dispersion containing mainly carbonaceous or graphite and charcoal gray or dark gray with a white stripe and white. If completely black, said black jade. (5) Topaz: limonite is surface water infiltration caused in white, beige to yellow Shanghai Tangun Trading Center antiques private domestic Preferred (professional appraisal of antiques, antiques trading center) specializes in antique antique appraisal, auction, private transactions, exhibitions, sales, collection and investment. Services: antique appraisal, antique appraisal, art exchange appreciation, art acquisitions, sales exhibitions, in private transactions. Call for range: ancient ceramics, ancient calligraphy and painting, high ancient jade, miscellaneous and other fine ceramics: ancient kilns and each generation of the kiln, ancient porcelain, high porcelain, porcelain Song, Yuan, Ming porcelain, jade: Liangzhu, Red Hill, Yongsan jade, high ancient jade. Famous paintings: ancient famous paintings, ancient paintings and other miscellaneous antiques: Yellowstone, Bloodstone, ancient coins, gold and silver, bronze, and other fine Shanghai Tangun companies to provide you with the most professional service, as long as your fidelity to the collection on behalf of, us can do to maximize the value of the collection, it is your best choice of fast trading platform. Contact: Gengjing Li tel: 18321910259 E-mail: 2880967136@qq.com Address: Huangpu District, Shanghai, Sichuan Road 320, 6th Floor, Building Amway