Clay minerals in the Amakusa pottery stones and some features of their pottery clays. (I) Properties of sericite.:Properties of Sericite
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Mineralogical properties of sericite which was one of the main clay minerals in Amakusa pottery stones were studied by X-ray powder diffraction analysis, infrared absorption analysis, electron microscopic observation, etc., Some features of the pottery clay were also discussed according to the difference between two kinds of pottery stone veins. The results were summarized as follows;<BR>(1) The half width of (001) of sericites included in Sarayama vein showslarger 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).<BR>(2) The clay minerals included in the pottery clay were separated into various particle size ranges by elutriation. The ratio (W<SUB>001</SUB>/W<SUB>002</SUB>) of (001) and (002) reflections of sericites (C-1, C-3) were plotted against particle size. The W<SUB>001</SUB>/W<SUB>002</SUB> of C-1 is larger than 1.0 for the part under 0.5μm, and is larger than 1.0 for the one over 5μm. The W<SUB>001</SUB>/W<SUB>002</SUB> of C-3 is larger than 1.0 for the part under 2μm. From these facts it is assumed that both sericites of C-1 and C-3 include less than 5% expandable layer.<BR>(3) The properties of interlayer sites of sericites were analysed by infrared absorption spectra. Fine grained sericites (-0.5μm) in Sarayama and Kaigan veins have a small amount of water molecule and ammonium ion respectively. Electron micrographs of fine sericite particles (S-1) exhibit mostly long pillar shape and those of S-2 show mostly rectangular shape.<BR>(4) Fine grained sericites show almost 1M polytype in Denbe-ekoba deposite, however, in Shimizuotoshi deposite they include a small amount of 2M<SUB>1</SUB> polytype. The coarse grained sericites (+20μm) from every pottery stone vein are the mixture of 1M and 2M<SUB>1</SUB> polytypes. Infrared absorption spectra also indicate that ammonium ions are included in coarse grained sericites.
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