天然産含ふっ素金雲母および合成ふっ素雲母の加熱変化 [in Japanese] Thermal Transformations of a Fluorine Bearing Mica and Synthetic Fluor Micas [in Japanese]
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Thermal transformations of a fluorine bearing phlogopite and synthetic fluor micas were studied mainly by X-ray diffraction method and thermogravimetry.<BR>Two phlogopites transformed to forsterite, leucite and glass; tetrasilicic potassium fluor mica to forsterite and glass; tetrasilicic sodium fluor mica first to fluormagnesiorichterite and enstatite, and then to enstatite, forsterite and glass.<BR>The phase transformations mentioned above were discussed by means of the phase assemblage expected from the phase diagrams of oxides whose end members are derived from the chemical compositions of the micas.<BR>The difference of the decomposition temperature between phlogopites and tetrasilicic micas was discussed on the basis of the crystal structures of the micas. It is considered that higher thermal resistivity of phlogopites might be attributable to their crystal structures in which the dimensions of tetrahedral layer are larger than those of tetrasilicic micas.
- Journal of the Clay Science Society of Japan (in Japanese)
Journal of the Clay Science Society of Japan (in Japanese) 21(2), 46-56, 1981
The Clay Science Society of Japan