一种伊利石仿独山玉的宝石学研究

Study on the Gemological Characteristics of an Illite-imitated Dushan Jade

为了确定一种仿独山玉样品的真伪,采用薄片鉴定、X射线粉末衍射法和电子探针分析对样品进行了分析测试。测试结果表明,该样品由伊利石和少量的绢云母组成,并不含有斜长石、铬云母等组成独山玉的矿物相,是一种独山玉的仿冒品。此外,结合显微鉴定特征和电子探针分析结果,笔者初步推断该样品所呈现的翠绿色为铁元素致色。这种仿冒品在外观上与独山玉很相似,常规宝石学参数也相似,但前者的硬度低于独山玉的。由于硬度检测属于有损检测,因此,建议检测机构在日常检测工作中结合红外光谱仪进行检测。

In order to determine the authenticity of a Dushan jade sample,it was analyzed by thin section identification,XRD powder diffraction and electron probe analysis.The test results showed that the sample was composed of illite and a small amount of sericite without plagioclase,mica and any other mineral phases that constitute Dushan Jade,implying that it was a counterfeit product.In addition,combined with the microscopic identification characteristics and electron probe analysis results,the author preliminarily concluded that the emerald green color present in the sample was due to the coloration of iron element.This counterfeit product is similar in appearance to Dushan Jade,and the conventional gemological parameters are also similar.But the hardness of the former is lower than that of Dushan Jade.Since the hardness test is a lossy test,it is recommended that the testing organization apply the infrared spectrometer for daily inspection.