Based on Mossbauer spectra and some related data, the authors have analyzed valence of Fe ion in sapphire and studied coloration mechanism of sapphire from Shandong Province. Absorption of visible light by Fe2+ -Ti4+ at 565 nm is the factor causing beautiful blue color, while black color results from Fe3+ absorbing visible light at 442 nm. Coloring experiments were carried out to remove Fe3+ as well as retain and add Fe2+ and Ti4+ , which prove to be successful.
李广慧,韩 丽,何 文,2002,山东蓝宝石的呈色机制及改色试验[J].岩石矿物学杂志,21(1):89~92. LI Guang_hui, HAN Li, HE Wen,2002,Coloration mechanism and coloring experiments of sapphire from Shandong Province[J]. Acta Petrologica et Mineralogica,21(1):89~92.
