Appearance of infrared (MgMgFe^<3+>)-OH stretching band in heat-treated holmquistites, sodic-calcic and sodic amphiboles

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Author(s)

    • ISHIDA Kiyotaka
    • Department of Evolution of Earth Environments, Graduate School of Social and Cultural Studies, Kyushu University

Abstract

Crystal-structural changes accompanied by oxidation and dehydrogenation processes have been examined for holmquistite, sodic-calcic and sodic amphiboles in which all Fe<SUP>2+</SUP> ions occur at the M1 and M3 sites, using infrared and Mössbauer spectroscopy. When almost all Fe<SUP>2+</SUP> are oxidized to Fe<SUP>3+</SUP>, a new OH-stretching band E appears at lower frequency (∼ a few cm<SUP>−1</SUP>) than the principal C band. This band is assigned to (MgMgFe<SUP>3+</SUP>)–OH stretching and its configuration to O<SUP>2−</SUP>–(MgMgFe<SUP>3+</SUP>)–(OH)<SUP>−</SUP>. The occupancy of Fe<SUP>3+</SUP> at M1 increases greatly by oxidation and dehydrogenation.

Journal

  • Mineralogical Journal

    Mineralogical Journal 21(4), 157-166, 1999-10-01

    Japan Association of Mineralogical Sciences

References:  17

Codes

  • NII Article ID (NAID)
    10008773601
  • NII NACSIS-CAT ID (NCID)
    AA00739590
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    05442540
  • Data Source
    CJP  J-STAGE 
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