摘要
选取新疆塔县石英岩玉为研究对象,采用偏光显微镜、电子探针、激光Raman光谱仪和紫外-可见-近红外吸收光谱仪就其矿物组成、化学成分、显微结构及谱学特征进行测试分析,并对颜色成因予以探讨。结果表明:塔县石英岩玉的主要矿物组成为α-石英,具粒状变晶结构,并含有不等量绿帘石、白云石、斜绿泥石、榍石、钾长石及黄铁矿、黄铜矿、赤铁矿、针铁矿等次要矿物。塔县石英岩玉的绿色主要由致色矿物绿帘石晶体结构中Fe^3+的d–d电子跃迁和Fe^2+—Fe^3+电荷转移引起;黄色和褐红色主要归因于石英颗粒间隙或裂隙中的纳–微米级针铁矿和赤铁矿,其紫外-可见-近红外吸收光谱的一阶导数光谱分别具有433~434 nm、512~538 nm和591 nm特征峰。
The mineral assemblages,chemical composition,microstructure and spectral characteristics of quartzite jade from Taxkorgan,Xinjiang were investigated by polarized microscopy,electron microprobe(EPMA),laser Raman spectroscopy and ultraviolet-visible-near infrared spectroscopy(UV-Vis-NIR),and the coloration mechanism was discussed as well.The result indicates that quartzite jade from Taxkorgan consists of mainly granoblastic texturedα-quartz and different amounts of epidote,dolomite,clinochlore,titanite,K-feldspar,pyrite,chalcopyrite,hematite and goethite.A combination of Fe^3+d–d electron transition and Fe^2+—Fe^3+charge transfer in the crystal structure of epidote is the main reason for green color.Yellow and brownish red colors are primarily attributable to nano-micron-sized goethite and hematite within quartz particles or in cracks,and some related peaks in their first-order derivative UV-Vis-NIR spectra are located at 433–434 nm,512–538 nm and 591 nm,respectively.
作者
钟倩
廖宗廷
赖萌
崔笛
李凌
周征宇
张灵敏
ZHONG Qian;LIAO Zongting;LAI Meng;CUI Di;LI Ling;ZHOU Zhengyu;ZHANG Lingmin(School of Ocean and Earth Sciences,Tongji University,Shanghai 200092,China;Laboratory of Gem and Technological Materials,Tongji University,Shanghai 200092,China;Shanghai Engineering and Technology Research Center of Gem and Material Technology,Shanghai 200092,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2020年第1期104-111,共8页
Journal of The Chinese Ceramic Society
基金
上海市科委科研计划项目(15DZ2283200,18DZ2281300)。
关键词
石英
RAMAN光谱
石英岩玉
一阶导数光谱
α-quartz
Raman spectroscopy
quartzite jade
first order derivative spectra
