European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 5
Articles | Volume 38, issue 5
https://doi.org/10.5194/ejm-38-583-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-583-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 5
Research article
 | 
15 Oct 2026
Research article |  | 15 Oct 2026

New methods for Fourier transform infrared spectroscopy investigation and quantification of OH absorption in anisotropic nominally anhydrous minerals: the example of pyroxene

Nils B. Gies, Jörg Hermann, Georgia Cametti, and Sonja Aulbach

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Short summary
This study presents new methods for enhancing Fourier transform infrared spectroscopy (FTIR) measurements to analyse the OH absorbance of anisotropic minerals. With new hardware and software solutions, large numbers of angle-resolved polarised spectra between 0 to 180° can be acquired, processed, and visualised. This allows us to identify spectral endmembers in the Si–O overtone region that can be used to find groups of mutually perpendicular spectra reducing uncertainty of H2O quantification.
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