安徽铜陵绿松石的紫外-可见光谱特征及颜色表征

UV-Vis Spectral Characteristic and Colour Characterization of Turquoise from Tongling,Anhui Province

采用紫外-可见光谱仪、红外光谱仪及其他宝石学分析测试方法,重点对安徽铜陵绿松石样品的显微特征、紫外-可见光谱、红外光谱及颜色特征进行了初步研究。结果表明,铜陵绿松石样品的紫外-可见光谱表现为[Fe(H2O)6]^3+所致421、429nm附近的吸收双峰以及[Cu(H2O)4]^2+所致的黄绿区—近红外区的宽大吸收带,且随着样品的主波长变小,[Cu(H2O)4]^2+所致的宽大吸收带向短波方向移动。此外,在主波长数值相近的情况下,样品的明度值与彩度值呈负相关。铜陵绿松石的红外光谱特征与其他产地的绿松石基本一致,仅在个别波数范围内由于结晶程度不同存在微小的偏差,说明铜陵绿松石的分子组成和其他产地的绿松石相同。

In this paper,UV-Vis spectrometer,infrared spectrometer and other methods of gemmological analysis were used to study the micropscopic characteristics,UV-Vis spectra,infrared spectra and colour characterization of the turquoise samples from Tongling,Anhui Province.The results showed that the UV-Vis spectra of the turquoise samples from Tongling reveals[Fe(H2O)6]^3+ absorption at 421,429 nm,and the wide absorption band of the yellow-green area near the near infrared region is caused by[Cu(H2O)4]^2+.As the main wavelength of the turquoise samples becomes smaller,the wide absorption band caused by[Cu(H2O)4]^2+moves towards the short wave direction.In addition,the brightness value of the turquoise samples from Tongling is negatively correlated with the chroma value when the main wavelength is similar.The results showed that the turquoise samples from Tongling have the same infrared spectra characteristic as turquoises from the other origins,and there is only a small deviation in a few wavenumbers which indicates that the molecular composition of the turquoise samples from Tongling is the same as turquoises from the other origins.