Appearance of infrared (MgMgFe3+)-OH stretching band in heat-treated holmquistites, sodic-calcic and sodic amphiboles.

• 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 Fe²⁺ ions occur at the M1 and M3 sites, using infrared and Mössbauer spectroscopy. When almost all Fe²⁺ are oxidized to Fe³⁺, a new OH-stretching band E appears at lower frequency (∼ a few cm⁻¹) than the principal C band. This band is assigned to (MgMgFe³⁺)–OH stretching and its configuration to O²⁻–(MgMgFe³⁺)–(OH)⁻. The occupancy of Fe³⁺ at M1 increases greatly by oxidation and dehydrogenation.

Journal

• Mineralogical Journal

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

  Japan Association of Mineralogical Sciences

Keywords

• General Earth and Planetary Sciences
• General Environmental Science

Details

• CRID: 1390282681522781312
• NII Article ID: 10008773601
• NII Book ID: AA00739590
• DOI: 10.2465/minerj.21.157
• ISSN: 18814174
• ISSN: 05442540
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed