Crystal structural features of hydrous forsterite: Effect of Fe on the M-site vacancies, possible hydrogen positions and variation of the unit cell dimensions

  • KUDOH Yasuhiro
    Institute of Mineralogy, Petrology and Economic Geology, Graduate School of Science, Tohoku University

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A qualitative understanding of the incorporation of hydrogen atoms in forsterite and corresponding octahedral vacancies are given from the inspection of the crystal structure with the view point of minimum strain configuration. In the case of Fe-free hydrous forsterite, the structural strain from the ideal size is larger in the M1 site than in the M2 site. Two H atoms may replace the Mg atom predominantly at the M1 site to reduce the structural strain, giving the vacancy at the M1 site. In the case of Fe-bearing hydrous forsterite, two H atoms may replace the Mg atom predominantly at the M2 site to avoid the combination of Fe in M1 site and Mg in M2 site for the reduction of the structural strain, giving the vacancy at the M2 site. In both cases, the most probable H atom locations are near to the edges of MO6 octahedra. Variation of the unit cell dimensions (∂b/b0 > ∂c/c0 > ∂a/a0) with the incorporation of hydrogen atom is interpreted in terms of retractable and unretractable chains in the part of olivine structure.

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詳細情報

  • CRID
    1390001206546119424
  • NII論文ID
    10022079586
  • NII書誌ID
    AA11460926
  • DOI
    10.2465/jmps.080620a
  • ISSN
    13493825
    13456296
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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