Chemical Composition and Spectral Characteristic of Jadeite Jade Dated to Qing Dynasty

Jadeite jade dated to Qing Dynasty has attracted much attention in the market, but there is little research on it currently. In recent years, some merchants have used B and C level jadeite to pass off as old jadeite jade dated to Qing Dynasty, and tried to confuse the public. This study conducts a scientific test on the jadeite jade samples from the Qing Dynasty, provides a spectral basis for comparison, and conducts a preliminary discussion on the origin of jadeite jade of Qing Dynasty. In this study, the authors studied the jadeite jade of Qing Dynasty unearthed from Tengchong, Yunnan Province using LA-ICP-MS, XRD, FTIR, Raman spectroscopy, fluorescence spectrometer and Scanning electron microscope.LA-ICP-MS results show that the jadeite jade sample of is marine sediment, Eu positive anomalies. Raman spectrum results show that the dark green sample contains omphacite absorption peaks. XRD results indicate that the dark green sample is dominated by jadeite and the minor mineral is omphacite. All samples have infrared spectrum absorption peaks of wax at 2 923 cm^-1 and 2 852 cm^-1. No glue or dye was found, which indicated that it is not modern B or C level jadeite jade. After second derivative calculation, it was found that the wax content is less, which may be introduced through the step of waxing during processing. Therefore, this indicates that the jadeite jade samples of Qing Dynasty are not modern bleached and dyed. SEM mapping demonstrates that organic matter C is clustered in mineral fissures. The three-dimensional fluorescence results of jadeite jade sample of Qing Dynasty manifest that the fluorescence center is mainly concentrated around 425 (λ_ex)/460 (λ_em), and the secondary concentration is around 370 (λ_ex)/433 (λ_em). By testing the three-dimensional fluorescence center of wax, it is the same as the primary fluorescence center of Qing Dynasty jadeite jade. The secondary fluorescence center is soil humic acid for Qing Dynasty jadeite jade. The Qing Dynasty jadeite jade is natural jadeite dominated by jadeite, containing wax. The fluorescence is caused by wax and soil humic acid.