The Mechanism of Thermal Transformation of Tetrasilicic Potassium Fluor Mica

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  • Ｋ型フッ素四ケイ素雲母の加熱相変化機構
  • Kガタ フッソ シ ケイソ ウンモ ノ カネツソウ ヘンカ キコウ

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Abstract

The process of thermal transformation of tetrasilicic potassium fluor mica has been studied by X-ray diffraction method and optical microscopy. The transformation process is markedly affected by the amount of specimen used for the heating experiments. Inthe case of a small amount of specimen, the tetrasilicic potassium fluor mica t ransforms at first into forsterite, subsequently into forsterite and enstatite, and finally into enstatite and glass phase, while in the case of a large amount of specimen, it transforms into forsterite and glass phase. The formation of enstatite may be attributable to the change of the chemical composition due to the vaporization of volatile matters (K, F etc.) at high temperature.<BR>The topotactic relations between the mica and the enstatite are maintained, and the mechanism of the thermal transformation mentioned above are discussed in relation to the crystal structure of the parent and the product phase.

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