水热法合成绿柱石的特征

Characteristic of Hydrothermal Synthetic Beryl

  • 摘要: 对市场上出现多种颜色的俄罗斯水热法合成绿柱石,采用常规宝石学测试、傅里叶变换红外光谱、紫外-可见吸收光谱、X射线荧光光谱分析等测试方法对其进行初步研究。结果表明,水热法合成绿柱石的折射率(1.565~1.584)普遍比天然绿柱石的高,其内部特征主要有水波纹状、面纱状、钉状、微波纹状流体包裹体,偶尔可见黑色渣状包裹体、八面体晶体等。近红外吸收光谱以7 141 cm-1(Ⅰ型水),5 271 cm-1(Ⅱ型水)为特征,5 456,5 101 cm-1显示为Ⅰ型水的振动所致。合成绿色绿柱石的致色元素主要有Fe、Cr和V;合成蓝色绿柱石的致色元素主要有Fe和Ti;合成粉红色和红色绿柱石的致色元素主要有Fe、Cu和Mn。

     

    Abstract: In order to identify the hydrothermal synthetic beryls with various colours from Russia occurred in the recent market, a group of beryl samples were collected and studied by using on conventional gemmological methods, Fourier transform infrared spectrometer, ultraviolet-visible spectrophotometer (UV-Vis), and energy dispersive X-ray fluorescence (ED-XRF). The results showed that the range of refractive index (1.565-1.584) of synthetic beryl samples is larger than that of natural beryl (1.575-1.581). The synthetic beryl samples have fluid inclusions with various shapes of wave-like, veil-like, spike-like, black residue and octahedral crystal inclusions. Near-infrared absorption spectra showed the peaks of 7 141 cm-1 (type Ⅰ water) and 5 271 cm-1 (type Ⅱ water), and the peaks of 5 456 cm-1 and 5 101 cm-1 which are the vibration of the type I water. The chromogenic elements of synthetic beryl samples are Fe, Cr, and V (for green ones), Fe and Ti (for blue ones), and Mn (for pink-red ones).

     

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