Abstract:In order to determine the petrological and mineralogical characteristics of a new kind of pink jade that appeared in Beijing jewelry market recently, the authors used X-ray diffraction(XRD), electron-probe microanalysis (EPMA) , whole rock chemical analysis and Fourier transform infrared (FTIR) spectroscopy to investigate the structure and composition of the pebble sample of this new kind of pink jade. On the basis of the mass balance principle, the proportions of the jade were estimated by means of the phase mixing calculation (PMC). The result shows that the fresh surface of this kind of jade is pink, whereas the weathered surface is yellowish gray. As for gemmological characteristics, this kind of jade is translucent to opaque and has glassy luster, with the relative density being 2.93. With the variation of the proportion of minerals, the refraction indices vary between 1.56 and 1.70. The minerals of the jade are mainly zoisite, albite and quartz, with small amounts of allanite and clinopyroxenes. Results of EPMA and whole rock chemical analysis with the adoption of PMC show that this kind of jade contains 51.9% zoisite, 33.30% albite, 14.4% quartz, 0.6% allanite and 0.1% clinopyroxenes. XRD data have given the same conclusion. The strongest infrared absorption bands of the pink mineral appear in the range of 1110~900 cm-1, similar to the peak value of standard zoisite, indicating that the main mineral of this jade is zoisite, and hence this new jade is a kind of felsic zoisite jade. In comparison with chemical composition of other colors of zoisites, the trace element Mn is very high, suggesting that the pink color of this kind of jade is caused by Mn. These results provide valuable reference for the rapid and accurate deter-mination of the jade.