Gemmological Characteristic of Ruby and Sapphire from Muling, Heilongjiang Province
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摘要: 测试样品为黑龙江省穆棱地区碱性玄武岩产出的红、蓝宝石。利用常规的宝石学方法测试，获得穆棱红、蓝宝石的宝石学特征。显微镜下观察发现种类丰富的包裹体，激光拉曼对包裹体成分测试可知，样品内含有大量富含CO2的气液包裹体和被破坏的针状包裹体。结合紫外-可见光谱以及LA-ICP-MS测试结果，分析得到穆棱红、蓝宝石的颜色成因：红宝石由Cr、Fe、Ti共同致色，黄色蓝宝石由Fe致色，蓝色蓝宝石主要由Fe、Ti共同致色。红外光谱显示样品中只有深色蓝宝石在3 309，3 233 cm-1处存在明显谱峰，证明深蓝色蓝宝石内有还原性羟基存在。依据实验所得数据及前人研究，推测深蓝色蓝宝石为碱性玄武岩相关的幔源蓝宝石，其它品种(红宝石、黄色蓝宝石)则在形成过程中经过了后期的区域变质作用。Abstract: Muling in Heilongjiang Province, located in the northeast of China, is an important part of the corundum deposits associated to magmatite at home. It is important to understand corundum foundation process for rational exploitation by revealing gemmological properties.
Ruby and sapphire samples were collected in placer deposits associated to alkali basalt from Muling，Heilongjiang Province.Rubies are gems of high quality and violetish red，while sapphires have more colours such as yellow and blue.The yellow suite and light blue suite possess pure colour with well transparency，while dark blue suite is opaque with dull colour. Besides，the variety of inclusions can be observed by microscope.Raman spectroscopy con— firms that a large number of C02 fluid inclusions and leaked fluid inclusions are contained in the samples.Based on geologic information of Muling，authors hold that corundum might have originated from the oxidization conditions of C02 fluid enrichment and resulted from stratum metasomatism. -
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