Abstract
Polarizedinfrared (IR) spectra of sanidine crystals from Volkesfeld, Eifel show the existence of two broad pleochroic absorption bands at 3,400 and 3,050 cm−1. Because overtones near 5,150 cm−1 were observed, the former bands are assigned to OH stretching frequencies of H2O molecules. On the basis of the pleochroic scheme of the bands it is proposed that H2O molecules occur as structural constituents entering theM site of the sanidine structure; the plane of the H2O molecules lies parallel to the symmetry plane.
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Beran, A. A model of water allocation in alkali feldspar, derived from infrared-spectroscopic investigations. Phys Chem Minerals 13, 306–310 (1986). https://doi.org/10.1007/BF00308347
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DOI: https://doi.org/10.1007/BF00308347