且末、若羌两地软玉的宝石学特征研究

The research on gemological characteristics to nephrite from Qiemo and Ruoqiang

采用常规宝玉石鉴定方法、扫描电镜、能谱仪对且末、若羌两矿区的软玉样品进行了测试研究,并对比分析且末、若羌软玉宝石学特征的异同。结果表明,且末、若羌两矿区软玉样品的主要矿物组成为透闪石,但后者的含量W(FeO)明显高于前者;两矿区软玉样品成因均为镁质大理岩型;且末软玉主要有显微针状纤维变晶结构、不等粒变晶结构,而若羌软玉具有交代环边结构、毛发状纤维—隐晶质结构。

By using the conventional gemological testing methods,polarzing microscope and energy spectrometer(xps),the nephrite samples from Qiemo and Ruoqiang are studied and in this paper.It compares the geomological characteristics to nephrite from Qiemo and Ruoqiang.The results show that the main miner in nephrite samples from QieMo and RuoQiang are tremolite nephrite,but the W(FeO)content in the nephrites from RuoQiang is obviously higher than that from Qiemo.The formations of nephrite in these two mining areas are both Magnesian marble type.The nephrite samples from Qiemo have Needle-like fiber structure,heteroblastic texture;while the nephrite samples from Ruoqiang have replacement ring edge structure and hair fiber-cryptocrystalline texture structure.