The crystal structure of hollandite.

DOI 5 Citations 8 References Open Access
  • MIURA Hiroyuki
    Department of Geology and Mineralogy, Faculty of Science, Hokkaido University

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Description

The crystal structure of hollandite from Gowari Wadhona, India has been refined. Chemical formula determined by EPMA and moisture counter is (Ba0.75K0.38)1.13 (Mn7.85Fe0.15)8O16·0.41H2O. The structure is monoclinic, I2⁄m, and cell constants are a=10.006(3)Å, b=2.866(1)Å, c=9.746(2)Å, β=91.17(3)°. Each atom exists on a mirror plane.(y=0, or 0.50). Manganese atom is in octahedral coordination. MnO6 octahedra are distorted and manganese atoms shift to unshared oxygens. The tunnel site is occupied by Ba2+, K+ and H2O. These cations and molecules do not show continuous distribution along the tunnel but only one single peak is observed. This mineral gives an X-ray powder pattern different from that of tetragonal hollandite. The relationship between the site occupancies of tunnel cations and the powder diffraction intensities is discussed. As the occupancy of tunnel site increase, the intensity ratio of I(200)+I(002) to I(301)+I(-103) decreases.

Journal

  • Mineralogical Journal

    Mineralogical Journal 13 (3), 119-129, 1986

    Japan Association of Mineralogical Sciences

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Details 詳細情報について

  • CRID
    1390001206545031424
  • NII Article ID
    130004794753
  • DOI
    10.2465/minerj.13.119
  • ISSN
    18814174
    05442540
  • Text Lang
    en
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
    • OpenAIRE
  • Abstract License Flag
    Disallowed

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