Hetian jade, also called tremolite jade, is one kind of nephrite, it is aggregation of tremolite mineral. White jade, grey\|white jade and grey jade are major species of Hetian jade. According to electron microprobe analysis, the major species are mainly composed of tremolite, in which the main chemical components are SiO2、MgO and CaO, with minor components of Al2O3、FeO、TiO2and MnO, some impurity minerals are found in Hetian jade. The color of jade is mainly related to the content of Fe2+、Ti4+ and Mn2+. Macroscopically, Hetian jade has compact massive structure, under the scanning electron microscope, felty texture, interlocking micro\|texture and granular micro\|texture can be observed.