鉱物学雜誌
Online ISSN : 1883-7018
Print ISSN : 0454-1146
ISSN-L : 0454-1146
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22 巻, 3 号
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  • 造岩鉱物としてのバイオパイリボール
    赤井 純治
    1993 年 22 巻 3 号 p. 95-111
    発行日: 1993/07/31
    公開日: 2009/08/11
    DOIhttps://doi.org/10.2465/gkk1952.22.95
    ジャーナル フリー
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    Biopyriboles are a famous examples of polysomatic series minerals. Recent progresses in studies on a variety of biopyriboles are reviewed. Many triple chain silicates with some different chemical compositions of optical microscopic and/or electron microscopic sizes were recently found to occur widely in various geological occurrences, and so, these new biopyriboles can be regarded as one of the important rock forming minerals. Many HRTEM studies on biopyriboles have been carried out and provided many useful data regarding the formation processes of the minerals. Unique structural features of biopyriboles indicating the records of the mineral process are also summarized.
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  • Gandolfiカメラを用いた微小結晶の格子定数の測定
    中牟田 義博
    1993 年 22 巻 3 号 p. 113-122
    発行日: 1993/07/31
    公開日: 2009/08/11
    DOIhttps://doi.org/10.2465/gkk1952.22.113
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    Application of a profile fitting technique to the x-ray powder data obtained by a Gandolfi camera makes it possible for us to measure the precise lattice parameters of small crystals of several ten μm in size, with an error of about 20 ppm. In this paper, the procedure determinig the lattice parameters by a Gandolfi camera is outlined through a review of some principles and techniques underlying it.
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  • 反磁性酸化鉱物の磁場整列効果
    磁性イオンを持たない酸化鉱物の磁気的性質について
    植田 千秋
    1993 年 22 巻 3 号 p. 123-130
    発行日: 1993/07/31
    公開日: 2009/08/11
    DOIhttps://doi.org/10.2465/gkk1952.22.123
    ジャーナル フリー
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    The diamagnetic orientation of nonmagnetic oxide minerals has been investigated recently using single crystals of various size. The magnetic orientation of micron sized sheet silicate was observed in the magnetic field of about 1T. This effect can be applied for estimating the value of diamagnetic anisotropy, Δχ, even if the mm-sized single crystal of the mineral cannot be obtained. The field induced rotation and harmonic oscillations of large diamagnetic mineral samples were reported for the cm-sized single crystals of quartz, corundum, forsterite and calcite. The observation can be applied for the minerals with small Δχ values of less than 5×10-10 emu/cc. The origin of diamagnetic anisotropy of oxide minerals is discussed in terms of a new model, in which the anisotropy is assigned to the individual chemical bond in the [MO6] octahedral unit of the crystal.
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