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Published August 1, 2006 | Published
Journal Article Open

OH in naturally occurring corundum


Hydroxide bands arising from intrinsic hydrous defects have been observed in the infrared spectra of 159 corundum crystals from worldwide localities. The OH defects are most prominent in blue sapphire crystals, suggesting an association of OH with redox reactions involving iron. Using a calibration for OH in kyanite, the absolute concentrations for OH in corundum are found to be generally 0.5 wt. ppm or lower. The linear OH absorption coefficient for the most intense band centered at 3310 cm^(−1) never exceeds 0.5 cm^(−1). In addition to the intrinsic OH defects, a number of previously identified hydrous inclusions often contribute to absorptions in the OH stretching region of the corundum infrared spectrum.

Additional Information

© 2006 E. Schweizerbart'sche Verlagsbuchhandlung. Received 26 January 2006; Accepted 27 March 2006. We wish to thank the following people for kindly providing corundum samples for this study: Joe Borden, John Emmett, E. Buzz Gray, Michael Gray, George Harlow, Tony Kampf, Robert E Kane, Peter Keller, H. F. Kennedy, Elbert King, Julius Petch, Robert Weiser and Ray Weldon. This investigation was supported by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung P8122-GEO and the National Science Foundation (USA) grants EAR-9218980 and EAR-0125767. Constructive reviews were provided by John Emmett, Christopher Smith, and two anonymous referees.

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