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

David. R. Bell¹, George R. Rossman

Division of Geological and Planetary Sciences
California Institute of Technology
Pasadena, CA 91125-2500, USA

Joachim Maldener², Denis Endisch³, Friedel Rauch

Institut für Kernphysik
J.W. Goethe-Universität
August-Euler-Str 6, D-60486, Frankfurt (M), Germany

¹Present address: Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85282

²Present address: Kennedystrasse 24a, 63477 Maintal, Germany

³Present address: Allied Signal Inc., 1349 Moffet Park Drive, Sunnyvale, CA 94089, USA

Kyanite H-105650, 17 mm wide

ABSTRACT

 The hydrogen contents of four natural kyanites 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 H₂O by weight) ranges from near zero up to 230 ppm. Its content is best determined from integrated absorbance of the OH bands in the 3200-3500 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).  

H-85493, 5 mm wide	LTL-3 embedded in plastic, 3 mm wide	FSM-15 in matrix
St. Gothard, Switzerland*	Letlhakane Mine, Botswana	Frank Smith Mine, South Africa

*Mislabeled in the original paper as Brazil.

Table 1.doc

Table 2.doc