Clays and Clay Minerals of Japan by Toshio Sudo

By Toshio Sudo

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They contain rare phenocrysts of quartz and plagioclase, of which the latter has the same mineralogical composition (oligoclase to andesine) as the feldspar in the Oya-ishi. The rock fragments are entirely altered to clayey material, which exhibits a deep bluish-green color when unexposed but becomes gray to black in daylight within about 1 hr, and then finally brown within a few weeks. The fragments are thus usually brown in color on exposed surfaces in the field. CLAYS AND CLAY MINERALS 43 The clay was judged by Sudo and Ota (1952) to be an iron-rich variety of montmorillonite.

Clay Science set out to be an international journal giving original articles principally in English. Advance of Clay Science included the proceedings of the annual general meetings giving the papers read at the meetings in Japanese, together with English summaries. The publication of Advance of Clay Science was discontinued in 1966. In 1964, the Group was reorganized as a Society-the Clay Science Society of Japan (CSSJ), which continues to publish both Nendo-Kagaku and Clay Science. 2. MODES OF OCCURRENCE, MINERAL ASSEMBLAGES AND ORIGINS The clays and clay minerals of Japan display various modes of occurrence such as in soils, zone of weathering, recent sediments, sedimentary rocks, and hydrothermally altered rocks.

7. X-ray powder diffraction pattern (A) and DTA curve (B) for fine particles suspended in sea water after the eruption of the Nishinoshima submarine volcano (Ossaka, 1975). (C) Relationship between the amount of iron in precipitates resulting from chemical interaction between the hot spring water and sea water at Satsumaiwojima, and the pH value of the sea water associated with the precipitate (Ossaka, 1975). 3. 1. ClassiJication The Nomenclature Committee of the AIPEA (Association Internationale pour 1’Etude des Argiles) has recommended a nomenclature and classification system for clay minerals (Pedro, 1967) which involves only the most general principles for common clay minerals.

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