粉色蔷薇辉石的宝石学及矿物学特征

Gemological and Mineralogical Characteristics of Bright Pink Rhodonite

本文以粉色蔷薇辉石为研究对象,通过宝石学显微镜、偏光显微镜、X射线粉晶衍射(XRD)、傅里叶变换红外光谱仪以及电感耦合等离子体发射光谱仪(ICP-OES)、X射线荧光光谱仪(XRF)、紫外—可见光分光光度计等测试手段,对其常规宝石学特征、矿物组成、颜色成因等宝石学和矿物学特征进行了较系统的测试分析。XRD分析表明样品物相主要是蔷薇辉石,含有少量石英。紫外—可见光光谱中能够见到345cm-1和413cm-1处的两条尖锐谱带,这是Mn2+由六重基态到四重激发态的跃迁而引起的。将样品的ICP-OES、XRF元素分析结果和以往文献相对比,发现不同产地蔷薇辉石中Mn元素含量均远远高于Fe元素含量,并在此基础上利用阳离子法计算得出样品的晶体化学式。

The gemological and mineralogical characteristics such as conventional gemological characteristics,mineral composition and cause of color formation of bright pink rhodonite were systematically investigated using gemological microscope,polarized microscope,X-ray powder diffraction(XRD),Fourier transform infrared spectroscopy,and inductively coupled plasma optical emission spectroscopy(ICP-OES),X-ray fluorescence(XRF),ultraviolet-visible spectroscopy(UV-Vis Spectroscopy)and other testing methods.XRD analysis showed that the sample phase is mainly rhodonite,containing a small amount of quartz.The intense bands of UV-Vis spectrum at 345 cm-1 and 413 cm-1 were excited from sextet-quartet transitions of Mn2+.Comparing the experimental results of ICP-OES and XRF with those of previous literature,it was found that the content of Mn elements in rhodonite from different origins was much higher than that of Fe elements.The crystal chemical formula of the sample was calculated based on the ICP-OES results.