一件绿色托帕石样品的检测

The detection of a green topaz sample

实验室收到一件黄绿色刻面型爪镶戒指进行检测,商家以橄榄石出售。通过常规的宝石学仪器设备对该试样的折射率、密度、发光特性等进行了检测,为确定其成分和微量元素,利用Nicolet iS5型傅里叶变换红外光谱仪、紫外-可见吸收光谱仪和X射线荧光能谱仪等对该样品开展了研究。结果显示:样品是覆膜托帕石,台面测得折射率为1.619~1.627,亭部及腰部不可测,亭部尖端可见刻面棱处明显的膜脱落现象,亭部有很高的Bi。根据我国国家标准《GB/T 16552—2017》规定,将该样品定名为覆膜托帕石。

The laboratory has detected a yellow-green faceted clawed ring,and the merchant sold it as an olivine.The refractive index,density and luminescence of the sample are tested by conventional and gemological instruments.In order to determine the composition and trace element,the sample is studied by Nicolet iS5 Fourier transform infrared spectrometer,UV-Vis absorption spectrometer and X-ray fluorescence spectrometer.The test result shows that the sample is a coated topaz with a refractive index of 1.619-1.627 measured on the mesa,and the pavilion and the waist could not be detected,the tip of the pavilion shows obvious film shedding at the edge of the facet,and the pavilion has a high Bi content.According to Chinese national standard"GB/T16552-2017",the sample is named as the coated topaz.