中国河南独山玉和菲律宾独山玉中主要矿物的谱学特征

Spectroscopic Study on the Main Mineral of Dushan Yu from Henan Province,China and the Philippines

对菲律宾吕宋岛独山玉和中国河南独山玉样品进行电子探针、拉曼光谱和红外光谱测试分析。电子探针结果显示,中国河南独山玉样品中斜长石为连续Na-Ca类质同像系列,而菲律宾独山玉样品中的斜长石主要为钙长石;菲律宾独山玉样品为β-黝帘石,而中国河南独山玉样品中α-黝帘石更多,两个产地样品中含有的透辉石在主要化学成分上一致。拉曼光谱结果显示,中国河南独山玉样品的拉曼吸收光谱为多种长石的混合图谱,而菲律宾独山玉样品中只出现了钙长石的特征吸收峰;两个产地样品中含有的黝帘石和透辉石的拉曼谱峰一致,但其形状、峰值大小和位置都有不同。红外光谱结果显示,菲律宾独山玉样品中所含长石的红外光谱与标准红外光谱一致,中国河南独山玉样品因类质同象,红外光谱发生改变;中国河南独山玉样品中黝帘石在600~400 cm^(-1)范围的红外光谱谱峰比菲律宾独山玉样品中数量多,且谱峰更加明显;两个产地样品中透辉石在600~300 cm^(-1)范围内的振动频率相同,在1100~850 cm^(-1)范围内的红外光谱略有不同。通过对其主要矿物组成和谱峰特征的研究,可以为两个产地独山玉的鉴别提供一定的依据。

Dushan Yu from Luzon Island of the Philippines and Dushan Yu from Henan Province,China were analyzed by electron probe microanalysis,Raman spectroscopy and infrared spectroscopy.The EPMA results showed that the plagioclase in Dushan Yu from Henan Province,China,is continuous Na-Ca isomorphic series,while the plagioclase in Dushan Yu from the Philippines is mainly anorthite.The Dushan Yu from the Philippine isβ-zoisite,while the Dushan Yu from China contain moreα-zoisite.The major chemical compositions of diopside in Dushan Yu from the two origins are consistent.The testing results showed that the Raman absorption spectrum of Dushan Yu from Henan Province,China,is a mixture of many kinds of feldspars,while only the characteristic absorption peak of anorthite appears in Dushan Yu from the Philippines.The Raman peaks of zoisite and diopside in the samples from the two origins are consistent,however their shapes,peak sizes and positions are different.The testing results showed that the infrared spectrum of feldspar in Dushan Yu from the Philippines is consistent with the standard spectrum,while the infrared spectrum of Dushan Yu from Henan Province,China,has changed due to the isomorphism.The infrared spectrum peak of zoisite in Dushan Yu from Henan Province,China,is more in the range of 600-400 cm^(-1) than that in Dushan Yu from the Philippines,and the spectrum peak is more obvious.The vibration frequency of diopside in samples from two origins is the same in the range of 600-300 cm^(-1),but the infrared spectrum is slightly different in the range of 1100-850 cm^(-1).Through the analysis of the main mineral components and spectral peak characteristics,a certain basis for the identification of Dushan Yu from Henan Province,China and the Philippines can be provided.