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Infrared spectra of olivine polymorphs: α, β phase and spinel

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Abstract

Infrared (IR) absorption spectra are presented for olivine (α) and spinel (γ) phases of A2SiO4 (A=Fe, Ni, Co) and Mg2GeO4. IR spectra of β phase (“modified spinel”) Co2SiO4 and of α Mg2SiO4 are also included. These results provide reference spectra for the identification of olivine high-pressure polymorphs. Isostructural and isochemical correlations are used to support a general interpretation of the spectra and to predict the spectrum of γ Mg2SiO4. A γ Mg2GeO4 sample equilibrated at 1,000° C shows evidence of partial inversion, but one equilibrated at 730° C does not. This suggests that partial inversion could occur in silicate spinels at elevated temperatures and pressures, however no evidence of inversion is seen in the ir spectra of the silicates in this study.

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  1. Raymond Jeanloz

    Present address: Department of Geological Sciences, Harvard University, 02138, Cambridge, MA, USA

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  1. Seismological Laboratory, California Institute of Technology, 91125, Pasadena, California, USA

    Raymond Jeanloz

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Jeanloz, R. Infrared spectra of olivine polymorphs: α, β phase and spinel. Phys Chem Minerals 5, 327–341 (1980). https://doi.org/10.1007/BF00307542

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