黄-红色缅甸黄龙玉颜色和光谱特征的定量研究

利用傅立叶红外光谱仪、激光拉曼光谱仪、紫外-可见分光光度计、能量色散X射线荧光光谱仪、电子探针X射线显微分析仪和X-Rite SP62手持式分光光度计对黄-红色缅甸黄龙玉样品进行了颜色特征、化学组成以及光谱学特征的研究,分析缅甸黄龙玉的颜色与光谱特性之间的定量关系。结果表明,缅甸黄龙玉主要由SiO₂组成,含少量Fe、Cu、Cr等过渡金属元素,属于隐晶质石英质玉。在CIE D65标准光源和N9孟塞尔中性背景下,缅甸黄龙玉的明度与色调角具有高度的相关性,Fe含量的变化对其明度和色调角具有显著影响。通过紫外-可见吸收光谱的一阶导数可以推断缅甸黄龙玉中针铁矿和赤铁矿的相对含量,且随着主波谷的位置向长波方向偏移,缅甸黄龙玉的颜色会从黄色调向红色调转变。

Quantitative study on color and spectral characteristics of Huanglong jade from Myanmar

The color characteristics, chemical composition and spectroscopic characteristics of the yellow-red Huanglong jade samples from Myanmar were studied through Fourier transform infrared spectrum, laser Raman spectrometer, ultraviolet-visible spectroscopy, an X-ray fluorescence spectrometer, electron microprobe analyzer, and an X-Rite SP62 hand-held spectrophotometer. The quantitative relationship between the color and spectral characteristics of Huanglong jade from Myanmar was analyzed. The results show that yellow-red Huanglong jade from Myanmar is mainly composed of SiO₂, with small amounts of Fe, Cu, Cr and other transition metal elements, and belongs to the cryptocrystalline quartz jade. Under CIE D65 standard light source and N9 Munsell neutral background, there is a high correlation between the lightness and the hue angle of the Huanglong jade from Myanmar, and the change of iron content has a significant effect on the lightness and hue angle of the Huanglong jade from Myanmar. The first derivatives of the ultraviolet-visible absorption spectra can infer the relative contents of goethite and hematite in the Huanglong jade from Myanmar, and the color of the Huanglong jade from Myanmar changes from yellow to red as the position of the primary wave trough shifts toward the long-wave direction.