天草陶石に含まれる粘土鉱物と陶土の性状について(I) : 原料陶石に含まれるセリサイトの性質

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1) The half width of (001) of sericites included in Sarayama vein shows larger values than those in other veins of Amakusa pottery stone according to the statistical analysis of about 250 kinds of pottery stones. Sericites of Kaigan and Murayama veins are almost the same values in half width of (001). (2) The clay minerals included in the pottery clay were separated into various particle size ranges by elutriation. The ratio (W_<oon/Wooa) of (001) and (002) reflections of sericites (C-1,C-3) were plotted against particle size. The Wool /W002 of C-1 is largnr than 1.0 for the part under 0.5μm, and is larger than 1.0 for the one over 5μm. The W_<001>/W_<002> of C-3 is larger than 1.0 for the part under 2 /tm. From these facts it is assumed that both sericites of C-1 and C-3 include less than 5 % expand-able layer. (3) The properties of interlayer sites of sericites were analysed by infrared ab-sorption spectra. Fine grained sericites (-0.5μm) in Sarayama and Kaigan veins have a small amount of water molecule and ammonium ion respectivel.y. Electron micrographs of fine sericite particles (S-1) exhibit mostly long pillar shape and those of S-2 show mostly rectangular shape. (4) Fine grained sericites show almost 1M polytype in Denbe-ekoba deposite, however, in Shimizuotoshi deposite they include a small amount of 2M_1 polytype. The coarse grained sericites (+20μm) from every pottery stone vein are the mixture of 1M and 2M_1 polytypes. Infrared absorption spectra also indicate that ammonium ions are included in coarse grained sericites.
日本粘土学会の論文
1986-03-07

天草陶石に含まれる粘土鉱物と陶土の性状について(I) : 原料陶石に含まれるセリサイトの性質

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