“海纹石”是具有蓝色条带的针钠钙石, 是一种稀有的宝石材料, 具有较好的市场前景。 为查明其矿物学特征及成因, 采用常规宝石学测试并结合X射线衍射（XRD）、 傅里叶红外吸收光谱（FTIR）、 拉曼光谱（Raman）、 扫描电镜（SEM）及紫外-可见分光光度计（UV-Vis）等现代测试方法, 对“海纹石”不同颜色部分的矿物成分及特征进行了深入分析。 XRD, FTIR, Raman分析结果表明, “海纹石”的主要组成矿物为针钠钙石, 并含有少量的方解石, 与SEM分析结果较为一致。 FTIR分析显示, “海纹石”白色部分在1 500 cm-1处出现一个明显的宽吸收带并伴有883和710 cm-1的吸收峰, 表明含有少量方解石, 而蓝色部分在该处没有此吸收。 紫外可见吸收光谱分析显示蓝色部分在可见光区有640 nm宽吸收峰, 表明可能含有微量元素Cu。 “海纹石”白色和蓝色部分矿物组分的差异, 表明两者可能形成于不同的地质环境。

Copper pectolite, a type of pectolite with blue stripes, is a rare gem material with a great market prospect. Mineralogy and genesis were investigated using X-ray diffraction (XRD), Fourier infrared absorption spectroscopy (FTIR), Raman spectroscopy (Raman), scanning electron microscopes (SEM) and ultraviolet-visible spectrometer(UV-VIS) to understand the mineralogical compositions and characteristics of the parts with different color. XRD, FTIR and Raman result showed that copper pectolite is composed of pectolite and minor calcite, consistent with the result of SEM. FTIR showed that an obvious band at 1 500 cm-1 with 883 and 710 cm-1 occurred on the white part that contain minor calcite, while the band was absent on the blue part. UV-Vis absorption spectroscopy analysis showed that the blue part has 640 nm absorption band in the UV area that indicates containing elements Cu. The different mineralogical compositions of the white and blue part indicate their different geological conditions