摘要
采用镜下观察、X射线衍射、电子探针成分分析、红外光谱、拉曼光谱、紫外-可见光谱等对纳米比亚库内内Kaokoveld透视石(Diop-Ka)的矿物学特征进行了系统研究。透视石晶体呈柱状,由六方柱和菱面体组成,绿色-浅蓝绿色,玻璃光泽,与水晶、砷钒铅矿等矿物共生。Diop-Ka中CuO含量只有45.02%~45.48%,而SiO_2含量高达42.33%~42.69%;CuO含量低于Diop-Ts(纳米比亚Tsumeb)和Diop-Ta(刚果Tantara),SiO_2含量则高于后两产地的。成分的变化导致其晶体结构骨架轻微的收缩,是引起Diop-Ka透视石红外光谱在900~1 200 cm^(-1),拉曼光谱在561 cm^(-1)附近、800和836 cm^(-1)处的强度和位置变化的主要原因。Diop-Ka在可见光区的最大透过窗口在500 nm附近,导致其呈现绿色-浅蓝绿色。
Mineralogical characteristics of Kaokoveld dioptase is investgated by X-ray power analysis,infrared spectroscopic analysis,electronprobe wave spectrum analysis,IR spectra,Raman spectra and Uv-vis spectra analysis. The dioptase with the associations of quartz and endlichite,and green to light cyan columanar crystals combinated by hexagonal prism and rhombohedron,occurs in Kaokoveld,Kunene region,Namibia. The electron-microprobe analyses show that the CuO contents vary from 45. 02% to 45. 48%,and SiO_2 contents vary from 42. 33% to 42. 69% in dioptase,different from Tsumeb dioptase and Tantara dioptase. Changes in chemical composition lead to a slight contraction of the crystal structure. It is the main reasons causing the changes of peak intensity and position of the Diop-Ka IR spectrum from 900 cm^-1 to 1 200 cm^-1 and Raman spectrum in the vicinity of 561 cm^-1,800 cm^-1 and 836 cm^-1 . The maximum transmission rate of Kaokoveld dioptase is near 500 nm,resulting in the crystal with the green to light cyan.
出处
《桂林理工大学学报》
CAS
北大核心
2016年第2期223-227,共5页
Journal of Guilin University of Technology
基金
国家自然科学基金项目(41362004)
作者简介
阮青锋（1971-）,男,博士,副教授,矿物学、岩石学、矿床学专业,rqfgut@163.com.
