红外光谱-拉曼光谱无损检测技术对透闪石和阳起石鉴定特征的研究

Research on Identification Characteristics of Tremolite and Actinolite by Using Nondestructive Testing Techniques of Infrared Spectroscopy and Raman Spectroscopy

透闪石属于角闪石族矿物,与阳起石构成完全类质同象,有关透闪石和阳起石的红外光谱和拉曼光谱的特征差异还未见有报道。本文以外观特征相似的5件广西大化黑青色阳起石样品和2件新疆塔县青玉样品为研究对象,在前期矿物成分测试的基础下,采用红外光谱和拉曼光谱进行测试和对比分析。结果表明,阳起石的红外光谱和拉曼光谱都表现为闪石类矿物的特征峰,与透闪石的特征峰存在细微差异,漫反射红外光谱的差异特征是鉴别两者最准确、快速、无损的依据,并且适用于任意形状的样品,符合珠宝玉石饰品实验室检测领域的要求,可为和田玉的分类分级和产地鉴别等提供科学依据。按照GB/T 16552-2017与GB/T 16553-2017规定,广西大化黑青色阳起石可定名为和田玉。

Tremolite belongs to amphibole group minerals and is a complete isomorphism of actinolite. The difference of infrared and Raman spectra between the tremolite and actinolite has not been reported. Five bluish black actinolite samples from the Dahua in Guangxi, and two gray jade samples from the Taxkorgan County in Xinjiang are used as the research object for testing and comparing their infrared and Raman spectra on the basis of previous analyses of their mineral compositions. Testing results show that the infrared and Raman spectra of actinolite show characteristic peaks of amphibole group minerals, with subtle differences to those of tremolte, respectively. The characteristic difference of diffuse reflection spectra between tremolite and actinolite is the most accurate, fast, and nondestructive basis for identifying actinolite and tremolite in any forms. It can provide some scientific evidences for the classification, grading and locality identification of the Hetian jade. According to provisions of the GB/T 16552-2017 and GB/T 16553-2017, the bluish black actinolite samples from the Dahua in Guangxi should be named the Hetian jade.