枝下木節粘土の鉱物化学的特徴

概要

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In order to elucidate the reason for low whiteness of the potteries from so-called Shidare-Kibushi clays, the samples collected at Mifune Mine. Aichi prefecture, were analyzed for mineralogical and chemical characteristics, and the results were compared with those obtained for the samples of Kibushi and Gairome clays from Motoyama Mine in Seto City. The samples consisted of quartz, kaolinite, small quantities of feldspars, smectite, and greenish platy particle with 10A d-spacing. The greenish platy particles were examined by means of TEM and EPMA. They were presumed to be iron-rich mica mineral partly kaolinized by weathering. The sample clays contained large amounts of Fe_2O_3 and TiO_2 in comparison with the other clays used for comparison. The reason for the low whiteness of Shidare-Kibushi clays was ascribed to the presence of relatively high contents of titanium and iron in the weathered iron-rich mica mineral contained.
日本粘土学会の論文
1988-04-10