Study on Colour and Gemmological Characteristics of Viridis Nephrite from Qinghai Province
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摘要:
软玉的颜色品种多样,其中翠青玉作为青海三岔河的一个特殊颜色品种受到市场上的追捧。为了研究翠青玉的主要成分及颜色成因,选取多个具有渐变色的代表性样品,分别对其运用红外光谱仪、拉曼光谱仪、激光剥蚀电感耦合等离子体质谱仪(ICP-MS)、USB2000光纤光谱仪进行了测试,通过红外、拉曼光谱发现翠青玉由透闪石组成,ICP-MS的成分测试结果显示该样品的翠绿色与Cr3+离子的质量分数呈正比,USB2000光纤光谱仪显示翠青玉中翠绿色部分的主波长在557nm附近,并且吸收光谱表现为橙黄区与蓝紫区的吸收,通过一系列的实验数据对翠青玉中致色离子的占位情况进行了相关讨论,并分析该离子来源于成矿母体中的基性岩浆岩。
Abstract:Nephrite presents in many differernt colours and the viridis nephrite occurred in Sanchahe East Kunlun is very popular in the market.In order to study the main components and colouring causes of viridis nephrite,the authors select some typical samples with gradual changing colours and test them with infrared spectrometer,Raman spectrometer,ICP-MS and USB2000 fiber optic spectrometer.The infrared spectrum and Raman spectrum indicate that the major mineral in viridis nephrite is tremolite.The results from ICP-MS show that the intensity of colour is proportional to the quantity of Cr3+.USB2000 fiber optic spectrometer shows that the main wavelength of viridis nephrite is 557 nm and the spectrum of orange area and blue purple area were absorbed.Based on a series of experiments,the authors also discussed the position of Cr3+ which caused the changes of colours in viridis nephrite.And Cr3+ was found in basic magma rock.
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Keywords:
- nephrite /
- viridis /
- colouring element /
- energy level split
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