摘要
河北宽城蛇纹石玉结构细腻,颜色可呈肉红色、绿色,当地市场称之为“热河玉”。本文通过常规宝石学测试结合激光拉曼光谱、电子探针、X射线粉晶衍射、激光剥蚀等离子质谱以及可见光吸收光谱等手段对其进行了系统分析,并采用伽玛能谱仪对其放射安全性进行了检测。结果表明,肉红色样品折射率及相对密度值均较低,折射率为1.54~1.55,相对密度为2.33~2.43,主要组成矿物为斜纤蛇纹石,主要具纤维交织结构、纤维柱粒交织结构,局部可见变余生物骨架结构,次要矿物有方解石和透辉石,Fe和Mn元素含量相对较高,Fe元素含量范围在184.9×10-6~951.7×10-6,Mn元素含量为106.4×10-6~287.3×10-6;绿色样品折射率为1.55~1.56,相对密度为2.58~2.62,主要组成矿物为叶蛇纹石,具更加细腻的纤维交织结构,次要矿物为滑石及四方硫铁矿,Fe元素含量极高,可达5979×10-6~6359×10-6。结合可见光吸收光谱分析结果认为Fe3+、Fe2+以及Mn3+的综合作用是导致样品呈现肉红色的主要原因,而Fe2+和Fe3+则是导致绿色的主要原因。放射性检测结果显示样品的内、外照射指数及放射性比活度值均低于标准要求,对人体无放射性危害。
The serpentine jade in Kuancheng County,Hebei Province has a delicate structure and can appear in flesh red or green colors.It is called"Rehe Jade"in the local market.This article systematically analyzed it through conventional gemological testing combined with laser Raman spectroscopy,electron probe,X-ray powder diffraction,laser ablation plasma mass spectrometry,and visible light absorption spectroscopy.Its radiation safety was tested by gamma spectrometer.The results show that the refractive index and relative density of the flesh red samples are both low,with 1.54~1.55 and 2.33~2.43.The flesh red samples contain main mineral of clinochrysotile and auxiliary minerals of calcite and diopside with fiber interwoven texture,and column-grain interwoven texture,and residual biological skeleton texture can be seen locally.The content of Fe and Mn in flesh red samples are relatively high,ranging from 184.9×10-6~951.7×10-6 and 106.4×10-6~287.3×10-6,respectively.The green sample has the refractive index of 1.55~1.56 and the relative density of 2.58~2.62.The green samples contain main mineral of antigorite and auxiliary minerals of tale and mackinawite,with more delicate fiber interwoven texture.The content of Fe in green samples is extremely high,ranging from 5979×10~(-6)~6359×10~(-6).Combined with visible light absorption spectrum test,it is considered that the comprehensive effect of Fe~(3+),Fe~(2+),and Mn~(3+)is the main reason for the appearance of flesh red in samples,while the effect of Fe~(2+)and Fe~(3+)is the main reason for the green color.The radioactivity test result shows that the internal and external radiation indexes,and specific activity values of Kuancheng serpentine jade are lower than the standard requirements,and the sample has no radioactive hazard to the human body.
作者
徐子维
孙佳乐
郝森
刘云贵
王礼胜
宋彦军
XU Zi-wei;SUN Jia-le;HAO Sen;LIU Yun-gui;WANG Li-sheng;SONG Yan-jun(School of Earth Sciences,Hebei GEO University,Shijiazhuang 050031,China;Comprehensive Security Center of Henan Provincial Department of Natural Resources,Zhengzhou 450016,China;School of Gemological and Material,Hebei GEO University,Shijiazhuang 050031,China;Gemstone Testing Center of Hebei GEO University,Shijiazhuang 050031,China)
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2023年第3期442-450,共9页
Acta Petrologica et Mineralogica
基金
国家自然科学基金(Z20210005)
河北省岩石矿物材料绿色开发重点实验室(筹)项目。
关键词
蛇纹石玉
宝石学
矿物学
颜色成因
放射性
serpentine jade
gemology
mineralogy
color genesis
radioactivity
