Abstract
The Ookuchi Clay Mine is situated at northwest part of Ookuchi-city, northwestern area of Kagoshima Prefecture, southern part of Kyushu, southern Japan. The mine has been worked for white clay, which is mainly composed of halloysite of spherical shape under the electron microscope. The purified clay, by means of water-washing methods, has been used for mixing clay material of coating clay for paper manufacturing industry. The geological formations consist mainly of andesitic lava flows and their pyroclastic materials, and the deposit is observed in an obsidian lava flow, which is intercalated in the andesitic formation (Fig. 2). The halloysitization in this mine is reactions of volcanic gases and waters to the glassy rock and it is also observed in andesite of upper horizon of the obsidian lava flow in small scale. Formation mechanisms of halloysite are investigated by means of chemical analyses, thermal analyses and X-ray powder methods, as shown in Tables 1 and 2 and Fig. 3.
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