“老挝田黄石”的物质组成特征

Compositional characteristics of the Laos Tianhuang Stone

针对近年市场新出现的老挝"田黄"石,采用折射率仪、静水称重法等常规宝石学特征分析,并结合傅里叶红外光谱(FTIR)、电子微探针(EPMA)、X射线粉晶衍射(XRD)等大型仪器分析测试技术,对老挝田黄石的谱学特征进行了研究,并与寿山田黄石进行对比。结果表明,老挝田黄石与寿山田黄石均以高岭石族矿物为主,常规宝石学性质相近。老挝田黄石主要成分为地开石、高岭石及地开石-高岭石过渡矿物,与地开石质寿山石(高山石等)类似,不含珍珠陶石;寿山田黄石主要成分则为地开石、高岭石、珍珠陶石,部分样品含有白云母。

The conventional gemological and spectral characteristics of newly appeared Laos Tianhuang Stone in recent years have been analyzed by using refractometer,hydrostatic weighing method,Fourier Transform Infrared Spectroscopy(FTIR),Electron Probe Microanalysis(EPMA)and X-ray Powder Diffraction(XRD),with analogical study of the Shoushan Tianhuang Stone in this paper.The experimental results show that both the Laos and Shoushan Tianhuang Stones are mainly composed of kaolin-group minerals with similar conventional gemological properties.The Laos Tianhuang Stone is mainly composed of dickite,kaolinite,and dick-kaolinite transition minerals with no nacrite,which is like dickited Shoushan Stone(n Gaoshan Stone).The Shoushan Tianhuang Stone is mainly composed of dickite,kaolinite,and nacrite,with muscovite locally.