天草陶石の構成鉱物と2,3の鉱物学的性質

概要

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The object of the investigation was to study mineral compositions of Amakusa ipottery stones and their properties in order to characterize their features. The pottery stones have been utilized as raw materials for china of high quality and porcelains such as electrical porcelains for ultra high voltage. In pottery stones, quartz is the most abundant and important mineral. The quartz grains showed some strains along a-axis, and from the comparision of transformation temperature to cristobalite, the quartz _grains included in its pottery stones were more reactive than that of pegmatite. Two kinds of sericite different in size are observed at the interstices among quartz grains. X-ray diffraction showed that coarse particles are the 2M_1 type and fine particles are 1M. Kaolin mineral is also contained as aggregates of minnute grains and electron microscopy exposed that they are well crystallized. Mixed-layer minerals such as smectite-Al chlorite and smectite-mica were often determined by X-ray examination, though smectite was rarely found. The smectite-mica regularly mixedlayer mineral is characteristically included only in the pottery stones of Sarayama vein. The features such as thermal properties and plasticity of the pottery stones are discussed in relation with their mineral compositions and the properties of constituent minerals.
日本粘土学会の論文
1982-12-25