水熱条件下におけるゾノトライトのMgCl_2処理 : スチブンサイトおよび "加水タルク" の成因に関する実験的研究 (第2報)

概要

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In order to investigate the genesis of stevensite and " hydrated talc " experimentally, natural and synthetic xonotlite were treated hydrothermally with MgCl_2 Solution for temperatures ranging from 100℃ to 450℃. The products were examined by means of X-ray diffraction, thermal analysis, infrared absorption spectroscopy and electron microscopy. Both natural and synthetic xonotlite alter to " hydrated talc " + chrysotile (200-400℃) and then talc + chrysotile (≧450℃). Below 150℃ is formed the poorly crystallized silicate having a trioctahedral layer structure. The formation of stevensite covld not be recognized under the present experimental conditions. However, it is worthy to note that the phase having the expandable layer was obtained by treatment with 1N MgCl_2 solution in the temperature range from 300℃ to 400℃. Some considerations have been made on the mechanism of the conversion of both natural and synthetic xonotlite into phyllosilicate.
日本粘土学会の論文
1976-11-25