岩矿测试2016，Vol.35Issue(1)：56-61,6.DOI:10.15898/j.cnki.11-2131/td.2016.01.010
电子微探针-X射线衍射-扫描电镜研究老挝石岩石矿物学特征
Study on PetrologiCal and MineralogiCal CharaCteristiCs of Laos Stone by EPMA-XRD-SEM
摘要
Abstract
Since the newly-discovered Laos stones have highly similar appearances with Shoushan stones,it is difficult to correctly identify and evaluate them. Electron Microprobe(EPMA),X-ray Powder Diffraction(XRD) and Scanning Electron Microscopy(SEM)were used to study the chemical composition,mineral components,and microstructure of the Laos stone. Results show that the Laos stone is mainly composed of kaolinite,dickite and their transitional minerals with minor nacrite. There is a positive correlation between the red color and the yellow color and the amount of impurity element Fe,which indicates that these colors are possibly caused by Fe. Laos stone's crystals are mostly irregular platy or uninterrupted pseudo-hexagonal platy. The smaller size the crystals have,the worse porosity of its crystals,leading to the finer texture and better seal engraving experience and therefore a higher value. The density(2. 58 - 2. 60 g / cm3 ),refractive index(1. 561 - 1. 570)as well as other conventional gemological characteristics of Laos stone are similar to todickite-type Shoushan stones. It is suggested that Laos stone with bright color and fine texture should be used as a new source of high-quality seal stones.关键词
老挝石/岩石矿物学特征/地开石/电子微探针/X射线粉晶衍射/扫描电镜Key words
Laos stone/petrological and mineralogical characteristics/dickite/Electron Microprobe/X-ray Powder Diffraction/Scanning Electron Microscopy分类
天文与地球科学引用本文复制引用
王含,周征宇,钟倩,刘瑞婷,刘琦,李英博..电子微探针-X射线衍射-扫描电镜研究老挝石岩石矿物学特征[J].岩矿测试,2016,35(1):56-61,6.基金项目
2012年度上海市科委项目(12DZ2251100) （12DZ2251100）
2015年度上海市科委项目(15DZ2283200) （15DZ2283200）
