韩国软玉的宝石学特征研究

Study of Gemological Characteristics of Korea Nephrite Jade

近年来市场上出现的韩国软玉具有一定的宝石学价值和商业价值。在对当地区域地质进行一定了解的基础上,通过市场调研及运用现代测试方法对韩国软玉的矿物成分、化学成分和宝石学性质进行了较为系统的研究。通过显微镜下观察,韩国软玉的主要矿物成分为透闪石,含量在98%左右,交代残余结构明显,但仍以毛毡状变晶结构为主。电子探针分析结果显示:韩国软玉在化学成分上与理论值较接近。运用X射线粉晶衍射仪对韩国软玉分析表明,主要矿物成分为透闪石,其各项参数指标与标准透闪石接近,含有少量方解石、蛇纹石,结晶度较好。韩国闪石玉矿床初步推断为花岗岩与白云质大理岩的接触交代矿床,这一观点与传统的新疆和田玉玉石矿床相似。

In recent years,the Korea Nephrite Jade appears in the Chinese market.The Korea Nephrite Jade has a great significance in both gem research and commercial value as well.Based on the understanding of local regional geology,we systematically studied the Korea Amphibole Jade＇s mineral,chemical content and gemological characteristics by market research and modern testing methods.Through analysis under microscope,the main mineral composition of nephrite is tremolite,accounting for about 98%.Replacement remnant ballistic texture is obvious under microscope and the main texture is felt-like ballistic texture.Electron microprobe analysis of tremolite shows that the Korea Nephrite Jade belongs to tremolite series.The X-ray powder diffraction analysis indicates that the main mineral composition of Korea Nephrite Jade is tremolite,all its parameters are very close to those of standard tremolite.Small quantities of calcite is included in Korea Amphibole Jade with a good degree of crystallinity.Based on the present material and research,we assume that the Korea Nephrite Jade deposit is the granite and dolomitic marble of the contact metasomatic deposit,which is similar to the deposit of Hetian Jade in Xinjiang.