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The intensity of amphibole OH bands in the infrared absorption spectrum

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Abstract

Polarized IR spectra of single-crystals of amphiboles show that the molar absorptivity of the fundamental vibrational OH band is strongly wavenumber dependent. The intensity increases by a factor of 1.6 from 3674 cm-1 (tremolite endmember; MgMgMg) to 3618 cm-1 (grunerite endmember; FeFeFe). Spectra obtained from Ca and Fe-Mg amphiboles consist of sharp, well-resolved bands on a well-defined background. The high intensity of the OH bands in Ca and Fe-Mg amphiboles makes it sometimes necessary to thin the samples to under 2 μm thickness, whereas alkali amphiboles can be measured at 25–50 μm thickness.

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Author notes

  1. Henrik Skogby

    Present address: Department of Mineralogy and Petrology, Uppsala University, Institute of Geology, Box 555, S-751 22, Uppsala, Sweden

Authors and Affiliations

  1. Division of Geological and Planetary Sciences, California Institute of Technology, 91125, Pasadena, CA, USA

    Henrik Skogby & George R. Rossman

Authors
  1. Henrik Skogby
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  2. George R. Rossman
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Skogby, H., Rossman, G.R. The intensity of amphibole OH bands in the infrared absorption spectrum. Phys Chem Minerals 18, 64–68 (1991). https://doi.org/10.1007/BF00199045

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  • DOI: https://doi.org/10.1007/BF00199045

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