缅甸紫色翡翠的致色机理——光谱和色度学研究
Colouration in purple jadeite-jade from Myanmar:A spectroscopy and chromaticity investigation
商嫣然 1王伟钊 1金天力 1黄琳铭 1吴中允 1郭颖1
作者信息
- 1. 中国地质大学(北京)珠宝学院,北京 100083
- 折叠
摘要
采用电子探针分析、能量色散X射线荧光光谱、傅里叶变换红外光谱、紫外-可见光谱和色度学方法等多种手段,对55个缅甸紫色翡翠样品进行了全面分析.结果表明,缅甸紫色翡翠的主要化学成分为SiO2、Al2O3和Na2O,含量与标准硬玉接近.色度学测试分析显示,缅甸紫色翡翠的彩度C*主要受色度值a*控制,而色调角h°主要由色度值b*控制.缅甸紫色翡翠可分为两种类型:Ⅰ型紫色翡翠主要由Mn3+致色,并在紫外-可见-近红外光谱570 nm显示主要吸收带;Ⅱ型紫色翡翠由于Fe2+-Ti4+之间的电荷转移致色,在光谱540 nm和610 nm显示吸收.两种翡翠中均存在Fe3+的吸收峰,样品中的全铁含量决定其色调角及明度.
Abstract
55 Myanmar purple jadeite-jades samples were comprehensively analyzed by electron microprobe analysis(EMPA),energy-dispersive X-ray fluorescence(ED-XRF)spectroscopy,Fourier transform infrared(FTIR)spec-troscopy,ultraviolet-visible(UV-VIS)spectroscopy and colorimetric methods.The results show that the main chemical compositions of Myanmar purple jadeite-jades are SiO2,Al2O3 and Na2O,and the contents are close to those of standard jadeite.Chromaticity test analysis showed that the chroma C*of purple jadeite-jade is mainly con-trolled by the colour coordinate a*,while the hue h° is mainly controlled by the colour coordinate b*.Myanmar purple jadeite-jades can be classified into two types:Type Ⅰ show the main absorption bands at 570 nm which is assigned by chromophore Mn3+and Type Ⅱ with two main absorptions at 540 nm and 610 nm are colored by charge transfer between Fe2+-Ti4+.The absorption peaks of Fe3+existed in both types of Myanmar purple jadeite-jades,and the full iron content in the samples determined their hue and lightness.
关键词
缅甸紫色翡翠/颜色成因/光谱学/宝石色度学Key words
Myanmar purple jadeite-jade/colouration/spectroscopy/gemmology colourimetry引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据