巴基斯坦磷钇矿的宝石学和谱学特征

Gemmological and Spectral Characteristics of Xenotime from Pakistan

  • 摘要: 巴基斯坦磷钇矿主要发育短柱状晶体,呈深浅不一的黄色,玻璃光泽,透明-半透明。采用常规宝石学仪器并结合红外光谱仪、拉曼光谱仪、紫外-可见光分光光度计,对巴基斯坦磷钇矿进行了常规宝石学和谱学特征研究。结果表明,巴基斯坦磷钇矿折射率为1.718~1.731,一轴晶正旋光性,呈黄色-深黄色中等程度的多色性,长波和短波紫外荧光均为惰性,相对密度为4.41~4.65。其矿物成分是磷钇矿,放大观察可见内部有大量气液包裹体及片状包裹体,红外光谱最强的特征峰在1 050~1 072 cm-1之间,还存在1 181、649、525、408 cm-1附近的特征谱线; 拉曼光谱最强的特征峰在998 cm-1处, 次强的特征峰在1 056 cm-1附近,在200~700 cm-1之间还表现出了很多特征峰; 紫外-可见吸收光谱的特征吸收峰多达10余处,最强的吸收峰位于653 nm左右。综合分析认为,特征包裹体、红外光谱、拉曼光谱和紫外-可见光吸收特征是天然磷钇矿的鉴别依据。

     

    Abstract: The xenotime from Pakistan mainly develops short columnar crystals with different shades of yellow, glass luster, and is usually transparent to semitransparent. By using conventional gemmological instruments, infrared spectrometer, Raman spectrometer, and ultraviolet-visible spectrometer, the gemmological and spectral characteristics of xenotime from Pakistan were studied. The results show the refractive index of 1.718-1.731, uniaxial positive optical character, medium degree of yellow-dark yellow pleochroism, none fluorescence, and relative density of 4.41-4.65. The xenotime mineral contains many gas-liquid inclusions and flake inclusions that can be found through microscopic observation. The strongest characteristic peak of the infrared spectrum of xenotime is between 1 050-1 072 cm-1, and there are 1 181, 649, 525 cm-1and 408 cm-1 characteristic lines. The strongest characteristic peak of the Raman spectrum is at 998 cm-1, and the second strongest characteristic peak is near 1 056 cm-1, and there are many characteristic peaks between 200-700 cm-1. There are more than 10 characteristic absorption peaks under UV-Visible light, and the maximum absorption peak is around 653 nm. This study shows that the inclusion, infrared spectroscopy, Raman spectroscopy and UV-Visible absorption characteristics are the basis for the identification of natural xenotime.

     

/

返回文章
返回