青金石的矿物组成新发现

New Found Mineral Compositions of Lapis lazuli

青金石是一种含有多组分矿物的宝石品种,为了研究青金石中的矿物组分种类,笔者收集了不同深浅蓝色调的青金石进行研究。并对青金石进行了常规宝石学测试、超景深显微镜观察、Diamondview^(TM)荧光观察、显微红外光谱、激光拉曼光谱测试。测试结果表明,青金石样品的组成矿物包括青金石、透辉石、方解石、磷灰石、方柱石、云母、重晶石、石、黄铁矿等。这些矿物在显微镜下及Diamondview^(TM)下呈现不同的形态及荧光特征,青金石为蓝色、紫蓝色矿物,Diamondview^(TM)下荧光颜色为深蓝色;透辉石、方解石、磷灰石、方柱石、云母、重晶石均为无色矿物,Diamondview^(TM)下透辉石可呈蓝白色、浅灰色、红色、紫红色及橙色荧光;方解石无荧光,当紫外光强度增强时呈弱红色荧光;磷灰石呈蓝色荧光;方柱石呈深灰色荧光;云母呈黄绿色荧光;重晶石呈灰紫色荧光;石为白色矿物,具金刚光泽,Diamondview^(TM)下呈灰色荧光;黄铁矿呈铜黄色,具金属光泽,Diamondview^(TM)下呈荧光惰性。其中磷灰石、重晶石是本文测试首次发现,在前人研究中均未提及到。Diamondview^(TM)在确定青金石的矿物组成时发挥了较重要的作用。

The Lapis lazuli is a kind of gemstone which contains a variety of minerals.In this paper,the lapis lazuli samples of different color are investigated using general gemological testing methods,Ultra-Depth microscope,Diamondview^(TM),Micro-infrared spectrometer,Laser Raman spectrometer,for distinguishing the mineral compositions of the Lapis lazuli samples.The results show that the lapis lazuli include minerals such as lapis lazuli,diopside,calcite,apatite,scapolite,mica,barite,sphene and pyrite.These minerals appear different shape and fluorescence characteristics under the microscope and Diamondview^(TM).The lapis lazuli is blue and purplish blue,its fuorescent color measured by Diamondview^(TM)is dark blue;the diopside,calcite,apatite,scapolite,mica,barite are colorlss,the furescent colorof diopside measured by Diamondviewcan be buish white,light gray red,purplish red and orange;the calcite is non-fluorescent,but its fluorescent color can be weak red by enhanced fuorescence intensity;the fuorescent color of apatite measured by Diamondviewr^(TM)is blue;the fuorescent color of scapolite measured by Diamondview^(TM)is dark gray the fuorescent color of mica measured by Diamondview^(TM)is yellowish green;the fuorescent color of barite measured by Diamondview^(TM)is grayish purple;the sphene is white,with adamantine luster,its fuorescent color measured by Diamondview^(TM)is gray;the pyite is brassy yllow,with metallic luster,and it is non-fuorescent measured by Diamondview^(TM).The apatite,barite are frst discovered in this paper.Diamondview^(TM)plays an important role in finding the mineral compositions of Lapis lazuli.