Study on Colouring Mechanisms of Blue Jadeite
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摘要: 近期广东市场上出现了一种来自缅甸的蓝色翡翠样品,该样品目前未见相关报道。为了确定其定名,通过常规宝石学测试、红外光谱和X射线粉末衍射测试对样品进行分析,表明样品的主要矿物组成为硬玉,质量分数约97.1%,检测鉴定结论为翡翠。为了对蓝色翡翠呈色机制进行研究,通过紫外可见吸收光谱测试,表明可见光区480nm以后逐渐增强的吸收带是其产生蓝色的原因;采用电子探针进行化学成分测试,表明蓝色的成因与钒离子有关。根据3d过渡金属离子的晶体场理论和翡翠晶体场理论的研究,可以推测:由于翡翠结构中M1位的Al3+被过渡金属离子钒(V4+)替代,引起八面体结构畸变而导致蓝色的产生,因此,蓝色是过渡金属离子钒(V4+)产生的原生色。Abstract: The blue jadeite,without any previous report,is recently appeared on the market of Guangdong Province.In order to identify the blue jadeite,the authors investigate sample with the conventional gemmological identification methods,such as infrared spectrometer(IR) and X-ray powder diffraction spectrometer(XRD).The results show that the main mineral component of this sample is jadeite and its content is 97.1%,so the sample is jadeite.To study its colouring mechanisms,the sample is tested with UV-Vis spectrum.The result shows that the main reason of showing the colour of blue is its absorption band,which is gradually enhanced after 480 nm at visible region.Chemical composition analysis by EPMA shows that blue of the sample is caused by vanadium ion.Based on the crystal field theory of both 3d transition-metal ions and jadeite,we can say that the transition metal ion——vanadium ion(V4+) caused the colour of blue because within the crystal the Al3+ is replaced by V4+ and this replacement is the cause of distorted octahedron.Therefore,blue is primitive colour caused by vanadium ion(V4+).
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Keywords:
- blue jadeite /
- colouring mechanisms /
- crystal-field theory /
- vanadium ion(V4+)
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