Detection of Emerald from Xinjiang by Electron Probe Microanalyzer and X-ray Diffractometer
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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).
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表 1 新疆祖母绿电子探针显微成分分析
Table 1 Analytical results of components in emeralds from Xinjiang by EPMA
原编号 样品名称 wB/% SiO2 Al2O3 K2O FeO CaO MgO Cr2O3 TiO2 MnO Na2O 总计 08TY-1 祖母绿 66.21 16.39 0.03 1.13 0.13 1.33 0.32 0.01 0.00 1.02 86.57 08TY-2 祖母绿 67.66 15.04 0.02 0.86 0.06 1.57 0.21 0.03 0.04 0.71 86.20 08TY-3 祖母绿 65.78 16.28 0.09 1.50 0.12 1.61 0.54 0.03 0.03 0.88 86.86 表 2 新疆祖母绿电子探针成分分析
Table 2 Analytical results of components in emeralds from Xinjiang by EPMA
样品名称 wB/% SiO2 Al2O3 K2O FeO CaO MgO Cr2O3 TiO2 MnO Na2O 总计 祖母绿 (内环) 65.30 16.36 0.15 1.26 0.18 1.72 0.43 0.02 0.02 0.95 86.39 祖母绿 (外环) 66.25 16.20 0.04 1.74 0.06 1.50 0.65 0.05 0.03 0.81 87.33 表 3 新疆祖母绿X射线衍射数据
Table 3 X-ray diffractometric data of emeralds from Xinjiang
序号 d hkl 第一次 第二次 第三次 平均值 1 7.993 7.997 7.997 7.996 100 2 4.594 4.594 4.594 4.594 110,002 3 3.984 3.984 3.984 3.984 200,102 4 3.257 3.257 3.257 3.257 112 5 3.017 3.018 3.018 3.018 210,202 6 2.871 2.871 2.871 2.871 211 7 2.525 2.526 2.526 2.526 212 8 2.297 2.297 2.297 2.297 220,302 9 2.208 2.207 2.207 2.207 104 10 2.155 2.155 2.155 2.155 311 11 1.992 1.992 1.992 1.992 312,204 12 1.835 1.835 320,402 13 1.797 1.797 1.797 1.797 321,313 14 1.741 1.741 1.741 1.741 304 15 1.715 1.715 1.715 1.715 411 16 1.629 1.628 1.629 1.629 412,224 17 1.600 1.600 1.600 1.600 500,314 18 1.571 1.571 1.571 323 19 1.532 1.532 1.532 1.532 006 20 1.517 1.517 1.517 1.517 413 21 1.460 1.460 1.460 1.460 116 22 1.436 1.434 1.436 1.435 510,422 23 1.371 1.371 1.371 1.371 512 -
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