Abstract
Polarized infrared (IR) spectroscopy of olivine crystals from Zabargad, Red Sea shows the existence of four pleochroic absorption bands at 3,590, 3,570, 3,520 and 3,230 cm−1, and of one non pleochroic band at 3,400 cm−1. The bands are assigned to OH stretching frequencies. Transmission electron microscopy (TEM) shows no oriented intergrowths in this olivine; it is concluded that OH is structural. On the basis of the pleochroic scheme of the absorption spectra it is proposed that [□O(OH)3] and [□O2(OH)2] tetrahedra occur as structural elements, assuming that the vacancies are on Si sites. If M2 site vacancies were assumed [SiO3(OH)] and [SiO2(OH)2] tetrahedra occur as structural elements.
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Beran, A., Putnis, A. A model of the OH positions in olivine, derived from infrared-spectroscopic investigations. Phys Chem Minerals 9, 57–60 (1983). https://doi.org/10.1007/BF00308148
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DOI: https://doi.org/10.1007/BF00308148