“外蒙”绿松石伴生矿物的拉曼光谱特征  

Raman Spectrum Characteristic of Associated Minerals of Turquoise from Mongolia

作　　者：刘佳 杨明星[1] 刘玲[1] LIU Jia;YANG Mingxing;LIU Ling(Gemmological Institute,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学珠宝学院,湖北武汉430074

出　　处：《宝石和宝石学杂志（中英文）》2022年第1期12-19,共8页Journal of Gems & Gemmology

基　　金：中国地质大学(武汉)珠宝检测技术创新中心项目,文章编号GICTWZ-20200007。

摘　　要："外蒙"绿松石具有伴生矿物丰富的特点。采用静水称重法测定得到"外蒙"绿松石样品的密度位于2.433~2.743 g/cm^(3),仅含较多白色伴生矿物高岭石的样品密度较低,质地疏松,其它绿松石样品均质地较好。采用拉曼光谱、电子探针、红外光谱测定"外蒙"绿松石样品的伴生矿物,拉曼光谱测试结果确定"外蒙"绿松石样品的伴生矿物有钠长石、石英、黄钾铁矾、白云母、锆石、针铁矿、金红石、锐钛矿、黄铁矿、磁黄铁矿、黄铜矿、硫铜钴矿;电子探针成分测定并通过阴离子法计算"外蒙"绿松石样品的伴生矿物,发现其为黄钾铁矾,化学式为(K_(0.393)Na_(0.300)Ba_(0.099)Fe^(2+)_(0.076)Sr_(0.030))_(∑=0.898)(Fe^(3+)_(3.087)Al_(0.061))_(∑=3.148)(S_(1.681)P_(0.273))_(∑=1.954)O_(8)(OH)_(6);红外光谱测定"外蒙"绿松石样品中白色伴生矿物指纹区振动与高岭石匹配。"外蒙"绿松石样品的伴生矿物硫铜钴矿的存在,可作为判定其产地的特征之一。Turquoise from Mongolia is rich in associated minerals.The relative density of the turquoise samples from Mongolia determined by hydrostatic weighing is between 2.433~2.743 g/cm^(3).The sample with kaolinite has lower relative density and loose texture,while other samples are homogeneous.Raman spectrometer,electron probe microanalysis and infrared spectrometer were used to determine the associated minerals,which include albite,quartz,jarosite,muscovite,zircon,goethite,rutile,anatase,pyrite,pyrrhotite,chalcopyrite,and carrollite.The chemical compositions of jarosite was determined by electron probe microanalysis with the results(K_(0.393)Na_(0.300)Ba_(0.099)Fe^(2+)_(0.076)Sr_(0.030))_(∑=0.898)(Fe^(3+)_(3.087)Al_(0.061))_(∑=3.148)(S_(1.681)P_(0.273))_(∑=1.954)O_(8)(OH)_(6).The infrared vibration of white paragenetic minerals fingerprint area was matching with kaolinite.The existence of carrollite in associated minerals can be used as one of the characteristics to determine the turquoise origin of Mongolia.

关 键 词：绿松石 伴生矿物 拉曼光谱 外蒙古 

分 类 号：P575.4[天文地球—矿物学] TS93[天文地球—地质学]