安徽铜陵绿松石的宝石矿物学特征

Gemmological and Mineralogical Characteristics of Turquoise from Tongling, Anhui Province

  • 摘要: 采用能量色散X射线荧光光谱仪(EDXRF)、激光剥蚀电杆耦合等离子质谱仪(LA-ICP-MS)、X射线粉末衍射仪(XRD)、红外光谱仪以及拉曼光谱仪等测试仪器对安徽铜陵枞阳县不同形态(板状、籽粒状、疏松球状)绿松石样品进行了成分测试与分析。通过EDXRF和LA-ICP-MS分别测定了安徽铜陵绿松石样品的主量元素和微量元素的质量分数,结果显示,主量元素随样品的形态变化存在一定变化。安徽铜陵绿松石样品中Ba的质量分数与马鞍山绿松石中Ba的有差异;红外光谱测试显示,安徽铜陵绿松石样品的红外光谱吸收峰位于3 510, 3 466, 3 289, 3 077, 1 646, 1 126, 1 071, 1 014, 900, 839, 652, 588, 491, 434 cm-1处;拉曼光谱测试确定了安徽铜陵绿松石样品的共生矿物有石英、锐钛矿、重晶石;XRD测试发现籽粒状和板状绿松石样品的围岩成分为伊利石、石英、长石、高岭土,其中高岭土仅存在于“铜陵籽”绿松石围岩中,结合铜陵地区的地层特征确定围岩岩性为黏土质粉砂岩。

     

    Abstract: In this paper, the mineral componets of the different forms of turquoise (plate-shaped, grain-shaped, loose ball-shaped) from Zongyang County, Tongling, Anhui Province were analyzed by EDXRF, LA-ICP-MS and XRD, as well as infrared spectroscopy and Raman spectroscopy. The report determined the contents of major and trace elements of the turquoise samples from Tongling, Anhui Province by means of EDXRF and LA-ICP-MS, and their major elements vary with morphology. The content of Ba element in turquoise samples from Tongling, Anhui Province is different from that from Ma'anshan, Anhui Province. The infrared spectra showed that the vibrational spectra peak at 3 510, 3 466, 3 289, 3 077, 1 646, 1 126, 1 071, 1 014, 900, 839, 652, 588, 491, 434 cm-1. It was determined that paragenetic mineral concludes quartz, anatase and barite by the means of Raman spectra; and according to XRD testing result, the structure of grain-shaped and plate-shaped turquoise samples' surrounding rock are illite, quartz, feldspar and kaolin, and the kaolin only existes in the turquoise surrounding rock of grain-shaped turquoise samples. Combined with the regional stratigraphic characteristics of Tongling area, it is determined that the surrounding rock lithology is clayey silt.

     

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