多米尼加蓝色宝石Larimar的宝石学研究

目前,在国内珠宝首饰市场出现了一种被称作Larimar的宝石。对来自广州珠宝市场的Larimar样品的宝石学特征、化学成分、X射线粉末衍射和红外光谱进行了测试。结果表明,该Larimar样品的主要矿物组成为针钠钙石,含有极少量的辉铜矿和一种未能确定种属的含Cu硫化物。其紫外-可见吸收光谱分析表明,该Larimar样品的吸收特征与Cu有关。结合样品的吸收光谱特征、宝石学特征和化学成分推测,Larimar样品的蓝色可能与分布于针钠钙石中的含Cu硫化物有关。Larimar种属的确定对其鉴定及名称的规范有一定的指导意义。

Gemmological Research on Larimar Stone from Dominica

The gem stone which is called Larimar occurs in the Chinese jewelry marketnow.The gemmological characteristics,chemical compositions,X-ray powder diffraction and infrared spectrum of the Larimar sample are analysed in the paper in order to define its mineral group.The results show that the Larimar sample is mainly composed of pectolite.The ultraviolet-visible absorption spectrum of the sample suggests that the absorption characteristic of the sample is related to Cu.It is supposed that the blue colour of Larimar probably could be caused by the diffusion of Cu-bearing sulfide distrubuted in pectolite according to its absorption spectrum and gemmological characteristics and chemical compositions.The definition of the mineral group of Larimar could be of significance to its identification and naming.