天然南红和热处理南红鉴别方法研究  

IDENTIFICATION METHOD RESEARCH OF NATURAL NANHONG AND HEAT-TREATED NANHONG

作　　者：陈大鹏 戴苏兰[1,2] 徐速 罗琴凤 石小平[3] 夏玉梅 曲蔚 廖俊 Chen Dapeng;Dai Sulan;Xu Su;Luo Qinfeng;Shi Xiaoping;Xia Yumei;Qu Wei;Liao Jun(Sichuan Institute of Product Quality Supervision&Inspection,Chengdu 610100,Sichuan,China;Chengdu Institute of Product Quality Inspection Co.Ltd.,Chengdu 610100,Sichuan,China;Sichuan Provincial Coal Design&Research Institute,Chengdu 610031,Sichuan,China)

机构地区：[1]四川省产品质量监督检验检测院,四川成都610100 [2]成都产品质量检验研究院有限责任公司,四川成都610100 [3]四川省煤炭设计研究院,四川成都610031

出　　处：《矿物岩石》2022年第2期1-14,共14页Mineralogy and Petrology

基　　金：国家标准研制项目《玛瑙南红玛瑙鉴定》(国标委发[2020]48号文批准20203697-T-334)。

摘　　要：近期,市场上出现一种外观与天然南红极为相似的热处理南红,由赤铁矿致色,颜色均匀,质地细腻,给南红市场带来很大冲击。本次研究应用实验室常规检测仪器,以及红外光谱仪、紫外-可见分光光谱仪、激光拉曼光谱仪、X射线衍射仪等大型仪器设备,测试分析了目前市场上四个有代表性的产地,即四川、云南、蒙古、非洲产出的天然南红,以及市场上出现的两类热处理南红和被用于热处理南红的黄色玉髓。同时选取了部分黄色玉髓和天然南红进行热处理实验和变温拉曼光谱分析,并应用X射线衍射仪对拉曼光谱分析结果进行了验证。结果表明,放大检查、折射率、紫外荧光、密度等实验室常规测试以及红外光谱、紫外-可见分光光谱等测试方法均无法确证性有效区分天然南红和热处理南红。研究团队发现,热处理南红中赤铁矿通常具有明显660 cm^(-1)拉曼峰,其中MK系列样品赤铁矿峰高比(H_(610)/H_(660))通常<1,与天然南红不同;YK系列样品赤铁矿峰高比(H_(610)/H_(660))通常在0.4~1.9,与天然南红有部分重叠,但有重叠的样品,其斜硅石和α-石英峰面积比(A_(501)/A_(464))较天然南红高,通常>0.10。因此研究证明拉曼光谱中斜硅石和α-石英峰面积比(A501/A_(464))和赤铁矿峰高比(H_(610)/H_(660))相结合可以作为鉴别依据,有效区分天然南红和热处理南红。Recently,there is a kind of heat-treated Nanhong in the market that is very similar to natural Nanhong in appearance.The heat-treated Nanhong is colored by hematite,uniform in color and fine in texture,which brings great impact on the Nanhong market.In this paper,the conventional laboratory testing instruments,as well as infrared spectrometer,UV-Visible spectrometer,laser Raman spectrometer,X-ray diffractometer and other large instruments and equipment are applied to test and analyze the natural Nanhong from four representative regions,namely Sichuan,Yunnan,Mongolia,Africa.Two types of heat-treated Nanhong and the yellow chalcedony are used for comparative study.At the same time,some yellow chalcedony and natural Nanhong are selected for heat treatment experiment and Raman spectrum analysis with variable temperature,and the results of Raman spectrum analysis are verified by X-ray diffractometer.The results show that magnification,refractive index,UV fluorescence,density and other laboratory tests,as well as infrared spectroscopy,UV-visible spectroscopy and other testing methods can not distinguish natural Nanhong from heat-treated Nanhong.However,it is found that the hematite in heat-treated Nanhong usually has a significant Raman peak of 660 cm^(-1),and the peak height ratio(H_(610)/H_(660))of MK series samples is usually less than 1,which is different from the natural Nanhong.The peak to height ratio of hematite(H_(610)/H_(660))of YK series samples is usually between 0.4 and 1.9,which overlaps with natural Nanhong.However,the peak area ratio of moganite and α-quartz(A_(501)/A_(464))of YK series samples is higher than that of natural Nanhong,usually>0.10.Therefore,the combination of the peak area ratio of moganite to α-quartz(A_(501)/A_(464))and the peak height ratio of hematite(H_(610)/H_(660))in Raman spectroscopy can be regarded as a basis to distinguish natural Nanhong from heat-treated Nanhong.

关 键 词：南红 热处理南红 玉髓 玛瑙 拉曼光谱 赤铁矿 

分 类 号：P579[天文地球—矿物学]