A POORLY-CRYSTALLIZED SEPIOLITE FROM THE OEYAMA NICKEL MINE, KAYA-CHO, YOSA-GUN, KYOTO PREFECTURE
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概要
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Sepiolite is a very rare mineral in Japan and only one occurrence has been reported hitherto. The sepiolite from the Oeyama nickel mine would be speculated to attribute its formation to the reaction between serpentine rock and supergene water descending along fissures in the rock, considering from its occurrence; and it has been confirmed to be a variety of sepiolite exhibiting a very low crystallinity and giving an irregularity of the structure on the X-ray patterns as compared to that of typical one, further it would being considered also to be an incipient stage of the crystallization process from β-sepiolite to α-sepiolite described in the literature, judging from microscopical observation, electron micrographs, chemical analysis data, thermobalance curve, differential thermal analysis curve and X-ray data.
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