Raman spectroscopic study of olivine-group minerals

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    • MOURI Takashi
    • Department of Earth and Planetary Sciences, Nagoya University
    • ENAMI Masaki
    • Department of Earth and Planetary Sciences, Nagoya University


Synthetic end-members Mg<sub>2</sub>SiO<sub>4</sub>, Fe<sub>2</sub>SiO<sub>4</sub>, Mn<sub>2</sub>SiO<sub>4</sub>, and Co<sub>2</sub>SiO<sub>4</sub> and natural samples of forsterite-fayalite series, tephroite and monticellite, are investigated using Raman spectroscopy. </i>The Raman spectra of the olivine-group minerals have a characteristic set of two intense lines of the Si-O asymmetric stretching band (wavenumber κ<sub>1</sub>) and Si-O symmetric stretching band (κ<sub>2</sub>). The κ<sub>1</sub> and κ<sub>2</sub> values of the Mg<sub>2</sub>SiO<sub>4</sub>-Ca(Mg, Fe)SiO<sub>4</sub> series, in which the M2 site is occupied by nontransition elements, vary from 847 cm<sup>−1</sup> to 857 cm<sup>−1</sup> and from 815 cm<sup>−1</sup> to 825 cm<sup>−1</sup>, respectively, and their ω (= κ<sub>1</sub> − κ<sub>2</sub>) value is fairly constant around 32 cm<sup>−1</sup>. On the other hand, fayalite, tephroite, and other olivine-group minerals in which transition elements exist in the M2 site have a fairly constant κ<sub>1</sub> (836-839 cm<sup>−1</sup>) value and variable κ<sub>2</sub> (808-819 cm<sup>−1</sup>) and ω (20-32 cm<sup>−1</sup>) values. The ω value of the forsterite-fayalite series systematically increases with Mg#[= Mg/(Mg + Fe)] and is useful for determining their chemical compositions.


  • Journal of Mineralogical and Petrological Sciences

    Journal of Mineralogical and Petrological Sciences 103(2), 100-104, 2008-04-01

    Japan Association of Mineralogical Sciences

References:  24

Cited by:  1


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