Abstract
Publisher Summary This chapter presents the studies on the clays and clay minerals of Japan. The chapter presents the research and discussion that includes: (1) the specific properties of clay minerals as revealed by X-ray; thermal, electron optical analyses, etc.; (2) some of the analytical procedures; (3) synthesis; (4) changes in the properties of clays and clay minerals on heating, grinding, and chemical treatment; and (5) miscellaneous items. The chapter surveys the mineralogical properties, modes of occurrence, and origin of the clays and clay minerals found in Japan. Throughout geological time, volcanic activity has frequently occurred in Japan, resulting in an abundance of clays and clay minerals that occur as hydrothermal alteration products of various rock types, and as weathering products of volcanic ashes and glassy tuffs. The chapter reveals the studies based on the exchange acidity (in modern terminology) confirming the release of alumina on treatment with neutral salt solution, and revealing the important role of alumina in the clay acidity.
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