新疆粉色软玉的谱学特征及颜色成因研究

Study on Spectral Characteristics and Color Formation Cause of Pink Nephrite from Xinjiang

运用X射线粉末衍射仪、电子探针、红外光谱仪及拉曼光谱仪等测试方法,对粉色软玉样品的矿物组成、谱学特征进行了较为深入的研究,探讨了其颜色形成原因。测试结果表明,新疆粉色软玉的主要组成矿物为透闪石,同时含有绿帘石、斜绿泥石等杂质矿物。样品的主要化学成分为SiO_(2)、MgO及CaO,其中SiO_(2)的含量在58%左右,MgO的含量在25%左右,CaO的含量在12%左右,与透闪石的标准质量分数较为一致。红外光谱主要出现在455、548、647、680、758、829、915、998、1064、1145、1281cm^(-1)处,拉曼光谱显示了220、392、412、671、928、1026、1057、3674cm^(-1)等处的吸收峰,与透闪石的标准谱图一致。软玉的粉色属于次生色,应该与绿帘石有关,绿帘石因含Mn而呈现粉色。

The pink nephrite is taken as the research object.X-ray powder diffractometer,electronprobe,polarization microscope,infrared spectrometer,Raman spectrometer and other test methodsare used to analyze the mineral composition,spectral characteristics and possible color origin of the pink nephrite.The result shows that the pink nephrite samples from Xinjiang are mainly composed of tremolite,and there also contains impurity minerals such as epidote and clinopyrite.The main chemical compositions of pink nephrite are SiO_(2),MgO and CaO.The content of SiO_(2) is 58%,MgO is 25%and CaO is 12%,which are basically consistent with the theoretical content of remolite.Infrared spectra displays the typical tremolite absorption and spectral peak at 455,548,647,680,758,829,915,998,1064,1145 and 1281cm^(-1).Raman spectra demonstrated peaks are at 220,392,412,671,928,1026,1057,3674cm^(-1).The pink color of nephrite belongs to a secondary color,which should be related to epidote,which appears pink due to its Mn content.