Clays and Clay Minerals of Japan by Toshio Sudo

By Toshio Sudo

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Hayashi (1973) developed an analytical procedure for the quantitative determination of airborne asbestos. This procedure is based on a standard curve prepared by X-analysis of standard samples using high power X-rays. 8 cm2 in area, can be detected. 24. Societies and publications The Clay Research Group of Japan (CRGJ) was established in 1958. It produced three kinds of publications : Nendo-Kagaku, (Journal of the Clay Science Society of Japan), Clay Science, and Advance of Clay Science. Nendo-Kagaku was published in Japanese and included review articles, news, and some original articles (with English summaries).

As in the case of the Green Tuff, the clays, clay minerals and other alteration products associated with the Kuroko and Kuroko-type deposits are very complex in terms of their properties, modes of occurrence, mineral assemblages and origin. The latter undoubtedly involves sedimentation processes, hydrothermal alteration diagenesis, and combinations of these processes. Iwao, Kishimoto and Takahashi (1954) first performed mineralogical and geological studies on the wall rock alteration of the deposits in the Kosaka mine.

4) Mitsuishj, Okayama Prefecture. 5 ) Shokozan, Hiroshima Prefecture. 1-3) Largely composed of pyrophyllite. 4) Siliceous part consists of pyrophyllite and quartz (Matsumoto, 1968). 5 ) Aluminous part consists of pyrophyllite and diaspore. 1)-3), Yoshiki (1958); 4),5), Matsumoto(l968). 6 and 7) Toseki, Amakusa, Kumamoto Prefecture (Takeshi and Shiraki, 1969). 6) 1st class. 7) 4th class. I Kimizuka (1939) first reported the occurrence of kaolin minerals from the Mitsuishi Roseki deposits. Yoshiki made an extensive study of the microscopic, thermal and chemical properties of Roseki and reported dickite from the Shokozan Roseki (Yoshiki, 1944).

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