Single-crystal infrared reflectivity of pure Mg2SiO2 forsterite and (Mg0.86,Fe0.14)2SiO4 olivine |
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| Authors: | Bruno Reynard |
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| Institution: | 1. Department of Geological Sciences, University College London, Gower Street, WC1 E 6BT, London, Great Britain
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| Abstract: | New polarized infrared reflectance spectra of pure synthetic forsterite and natural Fo86-olivine have been recorded from 5000 to 100cm-1. Out of the 35 expected infrared active modes, 33 have been observed (8 B1u, 12 B2u, 13 B3u). The observed frequency shift from pure forsterite to Fo86-olivine is consistent with the higher mass of the substituted iron. The substitution of only 14% of iron also reduces the overal far-infrared reflectivity of olivine as compared to pure forsterite. Several discrepancies associated with previous studies of forsterite are explained by our investigation. We suggest that some of the previous investigations were complicated by polarization mixing. |
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