Study on the Relationship between the Relative Content of Moganite and the Crystallinity of Quartzite Jade by Raman Scattering Spectroscopy, Infrared Absorption Spectroscopy and X-ray Diffraction Techniques
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摘要:
石英质玉石的成分除α-石英外, 还或多或少含有一种低温低压的SiO2矿物"斜硅石", 关于斜硅石的相对含量与石英质玉石结晶程度的关系还未见有研究。本文选取中国云南龙陵、安徽霍山、广西贺州和内蒙古阿拉善盟地区所产出的不同类型的石英质玉石为研究对象, 采用拉曼光谱、红外光谱、X射线衍射分析技术, 确定了斜硅石的相对含量与石英质玉石结晶程度之间的关系。结果表明, 石英质玉石中斜硅石的相对含量越高, 石英质玉石的结晶程度越低; 其中拉曼光谱中能够描述斜硅石相对含量变化的502 cm-1/465 cm-1两峰强度比值(X)与石英质玉石的结晶度指数(Y)基本上呈负相关关系:Y=-0.36X+6.93(r=-0.94)。此结论为利用无损检测手段大致判断石英质玉石的结晶程度提供了新的思路, 同时也为定性评价石英质玉石的品级提供了科学依据和理论约束。
Abstract:Quartzite jade is composed of α-quartz and another silica phase, moganite, which forms under low pressure and low temperature conditions. At present, there are few studies on the relationship between the relative content of moganite and the crystallinity of quartzite jade. In this study, some quartzite jade samples from four locations in China(Longling, Yunnan province; Huoshan, Anhui province; Hezhou, Guangxi Zhuang Autonomous Region, and Alxa League, Inner Mongolia Autonomous Region), were analyzed by Raman Scattering Spectroscopy, Infrared Absorption Spectroscopy and X-ray Powder Diffraction techniques. The results showed a negative correlation between the relative content of moganite and the crystallinity of quartzite jade. The higher the relative content of moganite, the lower is the crystallinity index of quartzite jade. The relationship of the intensity ratio of 502 cm-1/465 cm-1 in the Raman scattering spectrum and the crystallinity index of quartzite jade, could be expressed by the equation of Y=-0.36X+6.93(the correlation coefficient is-0.94). This research could not only offer some new ideas about qualitatively estimating the crystallinity of quartzite jade by non-destructive testing methods, but also provide some scientific evidence and theoretical restrictions for qualitatively evaluating quartzite jade.
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表 1 不同产地石英质玉石样品的拉曼光谱和红外漫反射光谱信息
Table 1. Data of Raman spectra and infrared diffuse reflectance spectra of quartzite jade samples from different geographic origins
样品产地 样品编号 结构
类型拉曼光谱
峰强度比
I502/I465(%)拉曼光谱
峰面积比
A502/A465(%)红外光谱
强度比
I1095/I1157内蒙古
阿拉善盟
地区ALS-1 纤维状 15.29 15.87 1.746 ALS-2 纤维状 17.27 18.54 1.789 ALS-CH-1 纤维状 16.25 16.47 1.749 ALS-MNS-1 纤维状 19.54 19.63 1.874 ALS-MNS-2 纤维状 14.68 15.24 1.772 ALS-MNS-3 纤维状 16.00 16.13 1.743 ALS-BLMN-1 纤维状 16.54 17.21 1.759 ALS-BLMN-2 纤维状 20.37 22.00 1.724 ALS-KD1-1 纤维状 16.19 16.35 1.837 ALS-KD1-2 粒状 15.30 15.94 1.783 ALS-MNT-1 粒状 12.75 12.50 1.714 ALS-MNT-2 粒状 0 0 1.508 安徽霍山 HSY-60 粒状 2.92 - 1.722 TB1235 粒状 0 0 1.628 广西贺州 HZ-C-030 粒状 2.54 - 1.512 市场购买
(产地不详)AGATE-20 纤维状 16.30 17.62 1.793 AGATE-21 纤维状 17.13 17.93 1.830 AGAM10018 纤维状 4.62 - 1.602 AGAM10019 纤维状 0 0 1.605 注：I502/I465和A502/A465的数据均为每件样品20个测试点的平均
值。个别样品由于502 cm-1特征峰过小，无法准确计算出峰面
积，在表中以“-”表示。
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