大别山区石英质玉宝石矿物学特征研究

Gemmological and Mineralogical Characteristics of Quartz Jade from Dabie Mountain

  • 摘要: 大别山区石英质玉属新近发现的一种石英质玉(简称"大别山玉"), 具色彩绚丽、质地细腻温润等特点。利用偏光显微镜、扫描电子显微镜、X射线粉末衍射、化学分析、红外光谱分析等方法, 重点对"大别山玉"的矿物组成、化学成分、物理光学性质、微结构、红外吸收光谱等特征进行研究。结果表明, "大别山玉"具较典型的微粒-细粒结构, 主要矿物为石英, 含少量的绢云母、绿泥石、萤石、黄铁矿及其它粘土矿物等次要矿物, 实属石英质玉; 其化学成分相对较纯, 主成分为SiO2, 含少量的Al2O3, CaO, MgO, Fe2O3, FeO, K2O等; 其红外反射光谱以Si—O非对称伸缩振动致特征的1177, 1104 cm-1谱带、Si—O—Si对称伸缩振动致800, 781cm-1分裂谱带以及由Si—O弯曲振动致492 cm-1较强谱带和542 cm-1弱谱带为特征。同时, 还对"大别山玉"的结晶度及水的赋存状态一并给予了探讨。

     

    Abstract: Quartz jade from Dabie Mountain is a newly discovered kind of quartz jade with brilliant colour, delicate and moist texture, which could be named by “Dabieshan jade”. By using the polarizing microscope, scanning electron microscopy, X-ray powder diffraction,chemical analysis, infrared spectrometer and other methods,the mineral component,chemicalcomposition,physical optical properties, microstructure, infrared absorption spectra characteristics of “Dabieshan jade” are mainly studied, The results show that “Dabieshan jade”is a kind of quartz jade,with typical fine particles, and minor amounts of sericite, chlorite, fluorite, pyrite and other minerals such as clay minerals. The chemical composition of “Dabies-han jade” is relatively pure, including the main component of SiO2,and a small amount of Al2O3, CaO, MgO, Fe2O3, FeO, K2. Infrared reflectance spectra of “Dabieshan jade” with 1 177,1 104 cm-1 spectra bands are caused by Si-O antisymmetric stretching vibration,800,781 cm-1 bands caused by Si-O-Si symmetric stretching vibration,and a relatively strong band of 492 cm-1 and a weak band of 542 cm-1 caused by Si-O bending vibration.

     

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