青海软玉产出的地质特征及物质成分特征

青海软玉自20世纪90年代初被开采利用以来逐渐被人们认识和喜爱,尤其被选定用来制作2008年北京奥运会的金、银、铜奖牌(金镶玉)后,更是引发了人们对它的极大兴趣,现已成为我国软玉玉料的主要来源之一。首先介绍了青海软玉产出的地质特征,并利用偏光显微镜观察、X荧光光谱分析、红外光谱分析、X射线粉末衍射分析等测试手段对各个颜色品种及不同成因品种的青海软玉样品进行了较系统的研究,结果显示,青海软玉的物质成分特征为:青海软玉的主要化学成分为SiO2,MgO,CaO,其质量分数较为稳定,变化范围不大;主要矿物组成是透闪石,其质量分数多数大于99%。

Geological and Composition Features of Nephrite from Qinghai Province

Nephrite from Qinghai Province has been recognized and loved gradually by people since the early 1990s.Especially,since it was selected to make the Gold,Silver,Bronze medals of 2008 Beijing Olympic Games,people have a great interest in it.At present,the nephrite from Qinghai Province has been a major source of nephrite in China.The geological features of nephrite from Qinghai Province are introduced in this paper.The nephrite samples of various colours and different causes from Qinghai Province are comprehensively and systematically tested by using the methods of polarizing microscopy,X-ray fluorescence spectrometer,infrared spectrometer,X-ray powder diffraction spectrometer and so on.The results show that the composition features of nephrite from Qinghai Province is SiO2,MgO and CaO as the main chemical ingredients and its contents are stable.The main mineral composition of nephrite from Qinghai Province is tremolite and its content is more than 99%.