Gemmological Characteristic of Poudretteite
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摘要: 硅硼钾钠石的宝石学特征的少有报道，为对该稀有宝石品种检测提供检测思路，对硅硼钾钠石样品进行常规宝石学测试，利用红外光谱仪、拉曼光谱仪、紫外-可见分光光度计和激光剥蚀-等离子体质谱仪进行了谱学特征和化学成分测试及数据分析。结果表明，硅硼钾钠石折射率范围在1.508~1.540，相对密度约为2.56~2.61，可见管状包裹体和气液包裹体，紫外灯下呈惰性，具紫红色、浅紫色中等至强的二色性；红外光谱指纹区显示1 198、1 054、951、908、797、597、559、506 cm-1和486 cm-1处特征峰；拉曼光谱测试特征拉曼位移有1 075、1 044、937、694、551、490、428、316、162 cm-1和146 cm-1；化学成分中主要含有SiO2、Na2O、K2O、B2O3，以及微量元素Al、P、Ca、Mn、Fe、Rb等，其中硅硼钾钠石含Mn元素显示紫外-可见吸收光谱测试在530 nm处绿区吸收，是其外观呈粉紫色、粉色的致色原因。Abstract: Poudretteite is a very rare gem variety, and its gemmological and spectral characteristics are rarely reported. In this paper, the gemmological and spectral characteristics and chemical compositions of poudretteite were studied using IR spectroscopy, Raman spectroscopy, LA-ICP-MS and UV-Vis spectrometer in order to provide gemmological data and the detection methods of the rare gem variety. The results showed that the refractive index of the sample is 1.508-1.540, and the relative density is 2.56-2.61. The samples showed inert under the ultraviolet lamp. It is dichromatism of purplish red and light pink. Using IR spectrometer, the absorption peaks of infrared fingerprint location feature are at 1 198、1 054、951、908、797、597、559、506 cm-1and 486 cm-1. Raman characteristic absorption peaks are at 1 075、1 044、937、694、551、490、428、316、162 cm-1and 146 cm-1. Poudretteite contains a certain amount of Al, P, Ca, Mn, Fe, Rb besides the main amounts of SiO2, Na2O, K2O, B2O3. And the 530 nm absorption band of UV-Vis spectrum is mainly caused by Mn.
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图 2 硅硼钾钠石样品的包裹体特征: a.空管状包裹体；b.愈合裂隙；c.气液包裹体
Figure 2. Inclusion characteristics of poudretteite samples: a.tubular inclusion; b.healed; c.gas-inclusions
表 1 硅硼钾钠石样品的常规宝石学特征
Table 1 Gemmological characteristics of poudretteite samples
样品号(颜色) 折射率 光性特征 二色性 相对密度 紫外荧光长波/短波 放大检查 P01(无色) 1.510~1.538 一轴晶正光性 无 2.56 惰性 惰性 无色、黄色空管状包裹体 P02(粉紫) 1.518~1.540 一轴晶正光性 强，紫红色、浅紫色 2.60 惰性 惰性 气液包体、管状包裹体 P03(粉色) 1.508~1.530 一轴晶正光性 强，浅紫色、粉色 2.61 惰性 惰性 “指纹状”愈合裂隙 
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表 2 硅硼钾钠石LA-ICP-MS测试结果
Table 2 Chemical compositions of poudretteite by LA-ICP-MS
/ppm 样品号 Be B2O3 Na2O Al2O3 SiO2 P2O5 K2O CaO MnO FeO Rb P01 1.54 109 700 68 700 8.5 770 000 430 50 500 240 1 450 77.4 P02 8.76 110 200 68 900 2.6 770 000 310 50 300 500 16 35 72.9 P03 5.90 111 500 68 900 21.6 769 000 350 50 400 200 18 45 72.7
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