STUDIES OF THE WHITE CLAY IN THE SOUTH KYUSHU : REPORT 11. THE STUDY OF YAMAGAWA CLAY

THE STUDY OF YAMAGAWA CLAY. YAMAGAWA clay, like Yoshinoyama clay, contains montmorillonite as its main clay mineral. The particle in it is mostly fine, 78% of it contains that of less than 30μ. and 68% of it than 1μ. This is considered to be common to montmorillonite. It is assumed by chemical analysis that besides montmorinonite, Yamagawa clay also contains inpurities such as kaoilne and ferrate. In differential thermal analysis, at 410°C, sharp endothermic reaction is observed. It is considered that this is caused by the deviation of bind water or OH radical as that reaction will disappear when the clay is calcinated by high temperature. But in X-ray difrraction an unknown peak is observed at 3.17A. It seems that this phenomenon has some connection with endothelmic reaction at 410°C, but this is not clear yet. Further study will make it clear