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Published July 2004 | public
Journal Article

Hydroxide in kyanite: A quantitative determination of the absolute amount and calibration of the IR spectrum

Abstract

The hydrogen contents of four natural kyanite samples were determined by 15N nuclear reaction analysis and used to calibrate an IR spectroscopic method for a more convenient quantitative H analysis of kyanite. Hydrogen is present as the OH^− ion and (expressed as ppm H_2O by weight) ranges from near zero up to 230 ppm. Its content is best determined from integrated absorbance of the OH bands in the 3200–3450 cm^(−1) range. Approximate concentrations can be determined from measurements of either summed peak heights or integrated areas of spectra obtained from just the two principal optical directions in the cleavage plane. The present calibration leads to estimates of the OH concentration in kyanite that are about a factor of 18 lower than the earlier calibration of Beran and Götzinger (1987).

Additional Information

© 2004 Mineralogical Society of America. Manuscript received October 6, 2006. Manuscript accepted December 15, 2003. Manuscript handled by Darby Dyar. We thank C. Francis for providing samples from the Harvard Mineral Collection, J. Gurney (Cape Town, South Africa) for sample FSM-15, and De Beers Consolidated Mines for sample LTL-3. This study was conducted with support from the Deutsche Forschungsgemeinschaft (grant Ra303/14) to FR and NSF grants EAR-8816006, EAR-9104059, EAR-9804871, and EAR-0125767 to GRR. DRB acknowledges support from DOE Office of Basic Energy Sciences grant DE-FG02-93ER14400 and the Geophysical Laboratory, Carnegie Institution of Washington. The manuscript was improved by critical comments from A. Beran and from the anonymous referees.

Additional details

Created:
August 22, 2023
Modified:
October 23, 2023