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OH groups in nominally anhydrous framework structures: An infrared spectroscopic investigation of danburite and labradorite

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Abstract

The pleochroic behaviour of two nominally anhydrous structurally similar minerals, danburite and An59 labradorite, was investigated in the region of the OH stretching frequencies. Danburite shows a sharp absorption band at 3540 cm−1, labradorite shows a broad band with an absorption maximum at 3230 cm−1. On the basis of the pleochroic scheme of theinfrared (IR) absorption spectra it is proposed that the OH dipoles in danburite are located within the symmetry plane showing a distinct orientation parallel to [010]; the OH groups in labradorite are oriented approximately perpendicular to (001). The proposed models are in accordance with bond valence calculations showing that in both framework structures the most deficient oxygens, O5 in danburite and O C m in labradorite, are partially replaced by OH.

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  1. Institut für Mineralogie und Kristallographie der Universität Wien, Dr. Karl Lueger-Ring 1, A-1010, Vienna, Austria

    A. Beran

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  1. A. Beran
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Beran, A. OH groups in nominally anhydrous framework structures: An infrared spectroscopic investigation of danburite and labradorite. Phys Chem Minerals 14, 441–445 (1987). https://doi.org/10.1007/BF00628821

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  • DOI: https://doi.org/10.1007/BF00628821

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