广西大化墨玉的矿物学及谱学特征研究

发布时间：2018-05-29 15:26

本文选题：广西大化 + 墨玉　；参考：《光谱学与光谱分析》2017年07期

【摘要】：近年来大量的墨玉在国内外玉石市场上陆续出现,广西大化墨玉是最新发现的墨玉新品种。为了探究广西大化墨玉的矿物学及谱学特征,针对产自广西大化瑶族自治县的墨玉样品进行了常规检测,以及采用X射线粉末衍射仪、激光拉曼光谱仪、傅里叶红外变换光谱仪和激光剥蚀等离子体质谱仪等现代谱学仪器测试分析,从矿物组成、拉曼光谱和红外光谱以及化学元素组成进行了研究分析。常规宝石学特征测试显示广西大化墨玉的折射率为1.64(点测),比重为3.12。偏光显微镜观察显示广西大化墨玉的主要矿物为阳起石,含量大于98%,结构为显微毛毡状结构。XRD测试明确样品主要成分为阳起石,其特征面网间距为8.498 3和3.145 9姒。傅里叶红外变换光谱仪测试结果显示样品的红外光谱与透闪石理论值接近,主要的特征峰为1 078,1 026,925,765,703,659,584,485,436cm~(-1),其中1 078,1 026,925cm~(-1)为O—Si—O和Si—O—Si的反对称伸缩振动及O—Si—O对称伸缩振动,765,703,659cm~(-1)为Si—O—Si对称伸缩振动,584,485,436cm~(-1)为Si—O弯曲振动。激光拉曼光谱测试测试结果显示样品的图谱基本集中在3500~3 800和119~1 054cm~(-1)这两个区域内,样品的拉曼光谱119~1 054cm~(-1)的特征峰中1 055,1 029和930cm~(-1)为闪石类矿物特征的Si—O伸缩振动,744和671cm~(-1)为Si—O—Si伸缩振动,且在671cm~(-1)是强度最大的特征峰位,代表硅氧四面体结构单元中桥氧的对称伸缩振动;在3 800~3 500cm~(-1)区间为M—OH伸缩振动区域,反映了M1和M3位置的阳离子与结构中的OH-成键的振动信息,位于3 628,3647,3 664,3 678cm~(-1),这是由于OH-伸缩振动导致。通过激光剥蚀质谱仪测试分析发现样品的主要化学成分为SiO2(52.4%),FeO(21.95%),CaO(12.5%)和MgO(12.4%)。此外还含有少量Al2O3,MnO,Na2O,P2O5,K2O和TiO2,由于样品富含Fe元素,计算Mg/(Mg+Fe)=0.504,因此大化墨玉为软玉中的阳起石玉,并由此推断大化墨玉的黑色由含铁量较高所致。
[Abstract]:In recent years, a large number of Mo jade in the domestic and foreign jade market, Guangxi Dahua Mo jade is the latest discovery of new varieties of Mo jade. In order to investigate the mineralogical and spectral characteristics of Dahua Moyu in Guangxi, the samples of Moyu from Dahua Yao Autonomous County in Guangxi were routinely detected, and X-ray powder diffractometer and laser Raman spectrometer were used. Modern spectroscopic instruments such as Fourier transform Spectrometer (FTIR) and Laser denudation Plasma Mass Spectrometer (PLMS) were used to study and analyze the mineral composition, Raman spectrum, infrared spectrum and chemical element composition. The conventional gemology characteristic test shows that the refractive index of Guangxi Dahua Moyu is 1.64 (the specific gravity is 3.12). The results of polarizing microscope show that the main mineral of Dahua Moyu in Guangxi is actinite, the content of which is more than 98 and the structure is microfelt structure. XRD test shows that the main component of the sample is actinite, and the characteristic surface network spacing is 8.498 3 and 3.145 9? The results of Fourier transform spectrometer show that the infrared spectrum of the sample is close to the theoretical value of tremolite. The main characteristic peaks are 102692576570365485436cm ~ (-1), in which 1 078U 1 026925 cm ~ (-1) are O-Si-O and Si-O-Si antisymmetric stretching vibration and 765 703659 cm ~ (-1) Si-O-Si symmetric stretching vibration 584485436 cm ~ (-1) is Si-O bending vibration. The results of laser Raman spectroscopy show that the spectra of the samples are mainly concentrated in the regions of 3 800 and 1 19 ~ 1 054 cm ~ (-1). The Raman spectra of the samples are characterized by Si-O-Si stretching oscillations of 1029 and 930 cm ~ (-1), which are characterized by amphibole minerals (744 and 671 cm ~ (-1), and at 671 cm ~ (-1) ~ (-1) are the largest characteristic peaks, respectively, in the characteristic peaks of 119 ~ 1054 cm ~ (-1) ~ (-1) ~ (-1) and 930 cm ~ (-1) ~ (-1) ~ (-1), respectively. Representing the symmetrical stretching vibration of the bridge oxygen in the SiO2 tetrahedron structure unit, the M-OH stretching vibration region is in the region of 3 800 ~ 3 500 cm ~ (-1), which reflects the vibration information of the cations in M1 and M3 positions and the OH- bonding in the structure. It is located at 3 628 / 3647 / 3664 / 3 678 cm ~ (-1), which is caused by OH- stretching vibration. The main chemical compositions of the samples were found to be SiO _ 2 ~ (2 +) ~ (52.4) and MgO ~ (12. 4) by means of laser denudation mass spectrometer. In addition, a small amount of Al _ 2O _ 3-MNO _ 2O _ (Na _ 2O) P _ 2O _ (5) O _ (5) K _ (2) and TIO _ (2). Because the sample is rich in Fe elements, the Mg/(Mg Fe ~ (2 +) is calculated to be 0.504, so Dahua Mo jade is the caterpillar in nephrite, and it is deduced that the black of Dahua Mo jade is caused by the high iron content.
【作者单位】：中国地质大学(武汉)珠宝学院;郑州信息科技职业学院;
【基金】：国家自然科学基金项目(41202038) 中央高校基本科研业务费专项资金基金项目(CUGW090229) 中国地质大学实验技术研究项目—重点项目(2013—23)资助
【分类号】：P575;P619.28

【相似文献】