南九州産白色粘土の研究-14-大河内・日出生台地区の白色粘土

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It is conceivable Okochi, Matsuo and Hijudai clays came into being that the volcanic eject which occured in the time of from the neogene tertiary latter period to the older quaternary period in these area owing to the comparative low hydrothermal alteration and acidic spa effect. These clays are composed of Halloysite chiefly, and contain pyroxene, quartz and feldspar as non weathering matter. The auther researched chemical analysis, refractoriness, thermal natures, X-ray diffraction and infra-red spectroscopy of these clays. The result of these studies, these clays possible to separate halloysite by means of the elutriation, and Okochi area clays contain feldspar, but Hijudai clay contains not feldspar. By the study of X-ray diffraction, under 550°C calcination treatment in these clays stracture of the (OOl) and (hk) relative intensity change owing to the stacking of mineral composition and there are effected by the stractural water and in the infra-red spectroscopy these clays non the less halloysite have the spectrum of 910cm^{-1}, 940cm^{-1}, and by the higher temperature treatment, these clays 1080cm^{-1} peak based on the Si-O band is shifted to the lower wave-length.
鹿児島大学,カゴシマダイガク,Kagoshima Universityの論文