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

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DOI 10.20086/j.cnki.yskw.2024.0312
刊名
Acta Petrologica et Mineralogica
年,卷(期) 2024, 43(3)
作者
作者单位

中国地质大学(北京) 珠宝学院, 北京 100083

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) spectroscopy, 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 controlled 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
KeyWord
Myanmar purple jadeite-jade; colouration; spectroscopy; gemmology colourimetry
基金项目
页码 643-651
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商嫣然,王伟钊,金天力,黄琳铭,吴中允,郭颖*. 缅甸紫色翡翠的致色机理——光谱和色度学研究 [J]. 岩石矿物学杂志. 2024; 43; (3). 643 - 651.

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