湖北秦古绿松石的可见吸收光谱特征

Visible Absorption Spectrum Characteristics of Qingu Turquoise from Hubei Province

采用USB2000微型光纤光谱仪测试了湖北秦古绿松石样品的可见吸收光谱，结果表明，该样品在可见光范围内存在a1（425～428nm）和a2（683～688nm）两处特征的吸收宽谱带，其可见吸收光谱主波长和纯度的变化与颜色特征具有一定的对应关系。根据变温实验中样品的可见变温吸收光谱和差热测试结果推测，秦古绿松石的颜色特征与其所含Fe离子价态、水的存在形式及其质量分数有一定的关系。

The visible absorption spectra of Qingu turquoise samples from Hubei Province are mainly tested by USB2000 Fiber Optic Spectrometer. The results show that two particular and wide absorption bands, band a1 （425～428 nm） and band a2 （683～688 nm）,are present in Qingu turquoise samples, and the dominant wavelength and purity of the visible absorption spectrum are corresponding to the colour characteristics. The results of the visible absorption spectra at rising temperatures and differential thermal analysis indicate that the colour characteristics of Qingu turquoise could be related to the iron ion and water content.