云南龙陵黄龙玉的振动光谱及XRD光谱表征

黄龙玉是云南省龙陵县近年发现的新玉石品种，在国内市场热度较高。目前对其矿物组成和光谱特征还未有报道。在常规的宝石学测试基础上，重点采用激光拉曼光谱仪、红外光谱仪和X射线粉晶衍射(XRD)分析方法，对其振动光谱特征和矿物组成进行了细致的研究。结果表明，黄龙玉显示典型的石英质玉石的振动光谱特征，主要红外吸收谱带位于1 162，1 076，800，779，691，530和466 cm-1处，分别属于Si—O—Si非对称伸缩振动、Si—O—Si对称伸缩振动、Si—O—Si弯曲振动。其中在800 cm-1附近谱带有分裂，表明黄龙玉结晶程度较好。拉曼光谱中，归属Si—O—Si弯曲振动的谱带强度较高，主要拉曼散射峰为463和355 cm-1。XRD结果证实，其矿物组成为较纯的石英，红色样品中还含有微量的赤铁矿，是其产生红色的原因。这是首次系统研究黄龙玉的红外光谱、拉曼光谱及XRD谱学特征，为其鉴定、定名及后续的研究提供科学依据。

Study on the Vibrational Spectra and XRD Characters of Huanglong Jade f rom Longling County,Yunnan Province

Based on the conventional test methods, the infrared absorption spectrum, Raman spectrum and X-ray diffraction (XRD) were employed to study the characters of the vibration spectrum and mineral composition of Huanglong jade. The testing results show that Huanglong jade shows typical vibrational spectrum characteristics of quartziferous jade. The main infrared absorption bands at 1 162, 1 076, 800, 779, 691, 530 and 466 cm-1 were induced by the asymmetric stretching vibration, symmetrical stretching vibration and bending vibration of Si-O-Si separately. Especially the absorption band near 800 cm-1 is split, which indicates that Huanglong jade has good crystallinity. In Raman spectrum, the main strong vibration bands at 463 and 355 cm-1 were attributed to bending vibration of Si—O—Si. XRD test confirmed that Quartz is main mineral composition of Huanglong jade and there is a small amount of hematite in red color samples which induced the red color of Huanglong jade. This is the first report on the infrared, Raman and XRD spectra feature of Huanglong jade. It will provide a scientific basis for the identification, naming and other research for huanglong jade.