Study of Gemological Characteristics of Korea Nephrite Jade

In recent years,the Korea Nephrite Jade appears in the Chinese market.The Korea Nephrite Jade has a great significance in both gem research and commercial value as well.Based on the understanding of local regional geology,we systematically studied the Korea Amphibole Jade's mineral,chemical content and gemological characteristics by market research and modern testing methods.Through analysis under microscope,the main mineral composition of nephrite is tremolite,accounting for about 98%.Replacement remnant ballistic texture is obvious under microscope and the main texture is felt-like ballistic texture.Electron microprobe analysis of tremolite shows that the Korea Nephrite Jade belongs to tremolite series.The X-ray pow derdiffraction analysis indicates that the main mineral com position of Korea Nephrite Jade is tremolite,all its parameters are very close to those of standard tremolite.Small quantities of calcite is included in Korea Amphibole Jade with a good degree of cry stallinity.Based on the present material and research,we assume that the Korea Nephrite Jade deposit is the granite and dolomitic marble of the contactmet asomatic deposit,which is similar to the deposit of Hetian Jade in Xinjiang.