电子探针和X射线衍射仪测定新疆祖母绿宝石

Detection of Emerald from Xinjiang by Electron Probe Microanalyzer and X-ray Diffractometer

摘要: 新疆首次发现了质量上佳的祖母绿宝石 (绿柱石)，受到了国内外学者的高度关注。文章对新疆祖母绿矿物晶体进行电子探针显微分析 (EPMA) 和X射线衍射 (XRD) 测试，获得EPMA成分分析结果及XRD测试晶胞参数、衍射图谱。结果表明，新疆祖母绿化学成分中Cr₂O₃含量较高，一般在0.21%~0.54%；典型样品晶胞参数测定结果为a₀=0.9233 nm，c₀=0.9206 nm，Z=2，主要粉晶谱线为2.871 (100)、3.257 (100)、7.996 (100)。

Abstract: The high grade emeralds (beryls) which were first discovered in Xinjiang have attracted attention of domestic and foreign scholars. In this paper, electron probe microanalyzer (EPMA) and X-ray diffractometer (XRD) were used for obtaining the data of chemical components, crystal cell parameters and diffraction patterns of the emeralds. The analytical results showed that the content of Cr₂O₃ in emeralds was higher up to 0.21% to 0.54% and the emerald cell parameters were a₀=0.9233 nm, c₀=0.9206 nm, Z=2 with main powder diffraction spectral lines of 2.871 (100), 3.257 (100), 7.996 (100).