Sapphires from Mingxi were investigated by such means as chromatic measurement, EPR, IR and TGA-DTA. It has a dark color mixed with yellow color and strong dichroism. The spectra obtained show that Fe3 is the main form of the Fe atoms, d-d leap of Fe3 and charge transfer are the main factors causing the formation of colors. The content of H is an important factor in the formation of blue color.
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张敬阳 袁心强, 2001. 福建明溪蓝宝石矿物学特征及致色机理探讨[J]. 岩石矿物学杂志, 20(2):162~166. ZHANG Jing-yang, 2001. causing Mechanism of Sapphires from Mingxi, Fujian[J]. Acta Petrologica et Mineralogica, 20(2): 162~166.
