In the market, there are four types of jade that are very similar in appearance to jade. It is easy to counterfeit the sale of pure natural jade. How to distinguish jade and jade? Siliceous jade Appearance features: water head foot, translucent above. Grease to glass luster. Green is more uniform. Extremely mixed with medium and high-end jade. Gemological characteristics: The mineral composition is mainly opal, chalcedony, quartz, containing a small amount of clay minerals. The refractive index is 1.45, the specific gravity is 2.13 to 2.50, the hardness is 6 to 6.5, white fluorescence, and the green color becomes red under the color filter. 2. Shiyan jade Appearance features: color gray green, cyan strip pattern, containing more impurities. Some heads are better, translucent and translucent. Easy to mix with non-bright green jade. Gemological characteristics: The main mineral components are amphibole minerals, feldspars, containing a small amount of chromite with a refractive index of 1.60 to 1.61, a specific gravity of 2.96 to 3.02, a hardness of about 6, and no fluorescence reaction. 3. Sodium feldspar jade The most fake jade stone in the market. The industry is known as "water foam jade." Appearance features: good head, color gray, white, accompanied by blue, green floating flowers, jade on the irregular, opaque "white brain" "cotton". Common varieties include bracelets, tags, and carvings. Gemological characteristics: the mineral composition is mainly albite, and the rest are pyroxene and amphibole minerals with a refractive index of 1.52 to 1.53, a specific gravity of 2.54 to 2.70, and a hardness of 5.0 to 6.0. Generally no fluorescence reaction. 4. Calcium aluminum garnet jade The industry calls this jade "tumbler." Appearance features: poor head, micro-transparent to translucent. Green is spotted or striped. Hardness and feel are similar to jade, and it is easy to mix with the jade of the ground. This kind of jade is in the market by a certain amount. Gemological characteristics: The main mineral composition is calcium aluminum garnet, which can reach more than 90%, including a small amount of slanting scutellite and Fushan stone. The refractive index is 1.71 to 1.72, the specific gravity is 3.41 to 3.44, and the hardness is 6.5 to 7. There is no fluorescence reaction. The color filter turns red in green. Printed Shirt Fabric,Natural Clothing Fabrics,Lacquer Printing Fabric,Lacking Printing Pattern Fabric SHAOXING YINFENG IMPORT AND EXPROT CO.,LTD , https://www.shaoxingyinfeng.com
March 12, 2021