インド産ルビー・マスコバイトの光吸収スペクトルと化学組成

概要

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Pale reddish-brown tinted Ruby Muscovite, from India has been studied in contrast to colorless Muscovite, by means of optical absorption spectroscopy and EDS-XRF. Absorption curve was measured over the range 350 to 1300nm. Tinted Muscovite indicates the distinctive absorption bands, mainly assigned to Fe^<3+> ions in the range of 440-550nm, while a colorless Muscovite indicates one band assigned to Fe^<2+> ion, in the range of 750-1000nm. Concentration of Fe^<3+> or Fe^<2+> ions are obtained, from total Fe confirmed by EDS-XRF and extinction coefficients of absorption band at 508 or 862nm. It is concluded that reddish-brown color is due to the presence of Fe^<3+> ions, and not to Mn or Ti ions.
日本粘土学会の論文
1993-08-31