Multi-spectroscopic Study of Green Quartzite (Guizhou Jade) from the Qinglong Antimony Deposit,Guizhou Province, China
Green quartzlte (also known as Guizhou Jade) from the Qinglong antimony deposit, Guizhou, China, has been investigated by petrographic observations, trace element analyses, and multi-spectroscopic techniques. Powder X-ray diffraction patterns and infrared absorption and reflectance spectra confirm petrographic observations that the green quartzite is comprised of predominantly microcrystalline quartz and minor a mounts of dickite. Inductively coupled plasma mass spectrometric analyses reveal Cr and V contents up to 78 and 107 ppm, respectively. Optical absorption spectra are composed of two broad bands centered at ～412 nm and ～571 nm, indicative of Cr3+ and V3+ ions in octahedral coordination. Identification of a VO2+ center and two Cr3+ centers by electron paramagnetic resonance spectra confirms the presence of V and Cr in dickite. Therefore, Cr3+ and V5+ ions in octahedral sites in dickite are responsible for the green color of Guizhou Jade, which is not affected by a two-year-long exposure to sunlight.
Guizhou Jade Cr3+ and V3+ quartz dickite multi-spectroscopy.
Yang Lin Rudolf Mashkovtsev Sanda Botis Pan Yuanming
MLR Guiyang Supervision and Testing Center of Mineral Resources, Guiyang 550004, China Institute of Geology and Mineralogy, Novosibirsk 630090, Russia Department of Geological Sciences, University of Saskatchewan, Saskatoon S7N 5E2, Canada
国际会议
The IPACES 6th Annual Meeting(“现代地球科学，交流与合作国际学术研讨会暨第六届IPACES学术年会)
武汉
英文
327-329
2007-04-25（万方平台首次上网日期，不代表论文的发表时间）