湖北英山刚玉矿物学研究

Mineralogy of Corundums from Yingshan County, Hubei Province

湖北英山刚玉矿床是本世纪五、六十年代发现的,由于多种原因未能对其进行研究和开发利用。本文系统地研究了英山刚玉矿物学特征,测定了各种物性和参数,观测了刚玉包裹体;并利用电子探针、粉晶X射线分析、可见光谱等现代测试手段,较详细地分析了刚玉的化学成分、晶体结构及光谱特征,并进行了热处理实验研究。指出湖北英山产出的刚玉颗粒大,晶形好,颜色较浅,可用热处理的方法改成蓝色、黄色、肉红色,但由于裂隙发育,包裹体密集,透明度差,能达到宝石级的极少,若提高宝石级产量,必须进一步解决裂隙拟合的工艺研究。

The corundum deposit in Yingshan county, Hubei province, was found in the 50's to 60's of this century. For some reasons, corundum in the deposit has not been exploited. The authors studied systematically the mineralogical characteristics of corundum from Yingshan county, determined various physical properties and parameters and observed inclusions of the corundum. By using electron microprobe, X-ray powder analysis and visible spectrum analysis, the chemical composition, crystal structure and spectral characteristics were analyzed. Besides, experimental study on its heat treatment was conducted. The authors consider that the corundum from Yingshan county has the characteristics of coarse grains, good morphology and light color. It can be blue-yellow- and flesh red-colored by means of heat treatment. But gem-quality stones are rare owing to well-developed fractures, inclusions concentrated inclusions and poor transparence. More should be done on the technique of healing the fractures in order to raise the production of gem-quality stones from these corundums.