利用傅里叶变换近红外光谱分析技术, 对源自国内外不同产地的软玉进行了测试与分析。 结果表明在7　000～7　400　cm-1波数范围内, 部分产地的软玉中出现四个由羟基倍频振动致近红外吸收谱带, 分别归属OH(Mg MgMg), OH(MgMgFe2+), OH(MgFe2+Fe2+), OH(Fe2+Fe2+Fe2+)的倍频振动所致, 并与软玉中透闪石矿物晶体结构中M1和M3位置的Mg2+, Fe2+占位有关。 随着透闪石中Fe2+/(Fe2++ Mg2+)比值的增大, 亦可导致软玉中羟基NIR谱带的进一步分裂, 谱带数目和强度增加, 并向低波数方向位移。 文中对软玉中羟基NIR光谱的产地鉴别意义一并给予了讨论。

Nephrite samples coming from various origins were investigated using Fourier transform near-infrared spectroscopy (FTNIR). The result shows that samples from some specific origins display four absorption bands of OH stretching vibrations in the 7 000~7 400 cm-1 region, which are ascribed to overtone vibrations respectively of OH(MgMgMg), OH(MgMgFe2+), OH(MgFe2+Fe2+) and OH(Fe2+Fe2+Fe2+), are related to Mg2+ and Fe2+ ion located in M1 and M3 positions of tremolite crystalline structure. With the raise of Fe2+/(Fe2++Mg2+) ratio in tremolite, splitting and redshift of OH vibration bands proceed, gaining an increase in wavenumber, band number and band intensity. Significance of the OH NIR spectra in nephrite origin identification is discussed.