采用X射线粉晶衍射(XRD)、 X射线荧光光谱(XRF)、 激光拉曼光谱和紫外可见吸收光谱等方法, 对产自缅甸翡翠矿区的一种类似于绿辉石质翡翠的墨绿色玉石品种进行了化学成分、 矿物成分及谱学特征研究。 XRD表明该玉石主要成分为钠长石与钙长石, XRF测试表明该玉石属于富铁的斜长石亚族, 端元组分在Ab0.731An0.264Or0.004～Ab0.693An0.303Or0.004之间。 利用拉曼光谱对比分析了该玉石与钠长石、 钙长石的谱学特征, 并对各特征谱峰作出指认。 紫外-可见吸收光谱测试表明其墨绿色与所含较高的Fe3+以及Cr3+的d—d电子跃迁有关。

Chemical compositions and spectral characteristics of one type of dark green jades assumed from omphacite jadeite from Myanmar jadeite mining area were studied by X-ray powder diffraction(XRD), X-ray fluorescence spectra(XRF), Raman spectra(RM) and UV-Vis Spectroscopy, etc. Based on testing by XRD and XRF, it was shown that it belongs to iron-enriched plagioclase, including albite and anorthite. The compositions range is between Ab0.731An0.264Or0.004 and Ab0.693An0.303Or0.004. Raman spectra of samples, albite jade and anorthite were collected and analyzed. Additionally, the distributions of Si, Al in the crystal structure were also discussed. UV-Vis spectra showed that dark green hue of this mineral is associated with d—d electronic transition of Fe3+ and Cr3+.