“油青种”翡翠的矿物学特征及颜色成因  

Mineralogy and Colosation of Oil-Green Jadeite Jade

作　　者：殷科[1] 田键[2,3] 马遇伯[4] 吴钰[5] 汪洋[2,3] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074 [2]湖北大学材料科学与工程学院,湖北武汉430062 [3]湖北大学天沭新能源材料工业研究设计院,湖北武汉430070 [4]国家珠宝玉石质量监督检验中心上海实验室,上海200122 [5]国家珠宝玉石质量监督检验中心,北京100013

出　　处：《光谱学与光谱分析》2014年第12期3323-3326,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目面上项目(21071050);国家自然基金项目专项基金项目(21241007);湖北省自然科学基金重点项目(2011CDA009);中央高校基本科研业务费专项基金项目(CUGL140805)资助

摘　　要：采用X射线衍射、红外吸收光谱及扫描电镜等现代测试方法,对"油青种"翡翠的矿物学特征及颜色成因进行了深入研究。X射线衍射分析结果显示,"油青种"翡翠"肉"的矿物组成为较纯的硬玉,而"皮"由硬玉、绿泥石及纤蛇纹石等三种矿物组成。红外吸收光谱分析所揭示的矿物组成与X射线衍射较为一致,同时发现"油青种"翡翠"肉"及"皮"具有~2 956,~2 919和~2 850cm-1等三个典型有机质的特征吸收峰。"油青种"翡翠"肉"中硬玉呈现明显的柱状,结晶程度明显好于"皮"中的硬玉,但"皮"中硬玉比"肉"中硬玉明显富含Mg,说明"皮"中硬玉发生过强烈的水/岩反应。纤蛇纹石仅在"油青种"翡翠的"皮"中出现,晶面呈现明显的弯曲状。在"油青种"翡翠"肉"的裂隙处及"皮"中均发现片状绿泥石的存在,可能为"油青种"翡翠致色的主要原因。形成于还原性水/岩反应的绿泥石,会吸附或者包裹一定量的有机质,导致"油青种"翡翠出现有机质的特征吸收峰。Mineralogy and coloration of oil-green jadeite jade were investigated using X-Ray diffraction（XRD）,Fourier transform infrared absorption spectroscopy（FTIR）and scanning electron microscopy（SEM）.XRD results show that＂flesh＂of oilgreen jadeite jade is mainly composed of relatively pure jadeite,whereas the＂skin＂of which is dominated by jadeite,chlorite and chrysotile.The mineral constituents revealed by FTIR are fairly consistent with XRD.Three typical adsorption peaks of^2 956,~2 919 and ~2 850cm^-1 related to organic matters occurred in both＂flesh＂and＂skin＂of oil-green jadeite jade.Jadeite in＂flesh＂exhibits an obvious columnar growth and has a better crystallinity than that of＂skin＂.However,jadeite in＂skin＂is richer in magnesium than that of＂flesh＂,suggesting an intense water-rock reaction of jadeite in＂skin＂.Chrysotile just occurs in＂skin＂of oil-green jadeite jade,and it presents a curved crystal plane.Flaky chlorite was detected in both cracks of＂flesh＂and＂skin＂,which might be the main cause of coloration of oil-green jadeite jade.Chlorite,formed in the reducing water-rock reaction,would adsorb or wrap a certain amount of organic matters,resulting in the occurrence of the characteristic adsorptions of oil-green jadeite jade.

关 键 词：“油青种”翡翠 矿物学特征 颜色 硬玉 绿泥石 有机质 

分 类 号：P571[天文地球—矿物学]