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There are several kaolin and one montmorillonite deposits, which are formed by hydrothermal alteration of volcanic rocks, in the Ibusuki district, Kagoshima Prefecture. The D.T.A. curve of a white kao...lin clay found from the Kotani deposit shows an endothermic peak at 650°C. Higher crystallinity and large grain size of this kaolinite are considered to yield the endothermic peak higher than that of typical kaolinite. Montmorillonite from the Narikawado deposit is beidellite, of which the chemical composition is: Ca_0.29(Al_1.86 Fe^3+_0.09 Mg_0.05) (Si_8.29 Al_0.71) O_10(OH)_2 nH_2O. Alteration process is observed in the Oyamado clay deposit. The chemical analyses of unaltered rock, intermediary part, and white clay reveal that Si02, Fe203, FeO and alkalies are leached out and H_2O is added.show more
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0901_p053