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Tosudite from the Hokuno Mine, Hokuno, Gifu Prefecture, Japan

Published online by Cambridge University Press:  01 July 2024

Atsuko Ichikawa  and
Susumu Shimoda
Atsuko Ichikawa
Affiliation:
Geological and Mineralogical Institute, Faculty of Science, Tokyo University of Education, Tokyo, Japan
Susumu Shimoda
Affiliation:
Geological and Mineralogical Institute, Faculty of Science, Tokyo University of Education, Tokyo, Japan
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Abstract

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Tosudite was found in the Hokuno pottery stone mine, Gifu Prefecture, Japan. The pottery stone ore body, altered from the Cretaceous rhyolitic rock, is composed of tosudite, interstratified illite-montmorillonite, kaolinite and quartz. Prepared by normal sedimentation method, the specimen is composed of 75.6% tosudite, 24.0% kaolinite and 0.4% quartz. The chemical composition of the specimen is SiO2 45.09%, TiO2 tr., Al2O3 37.31%, Fe2O3 0.94%, MgO 0.41%, CaO 1.94%, Li2O 0.45%, Na2O 0.09%, K2O 0.44%, H2O(−) 1.50% and ignition loss 12.11%. After subtracting the compositions of the impurities, the structural formula of tosudite is given as; interlayer cations K0.23, Na0.07, Ca0.86 + nH2O; ‘gibbsite’ layer Li0.76, Mg0.35, ${\rm{Fe}}_{0.29}^{3 + }$, Al3.34 (OH)12.00; silicate layer Al8.00 [Si13.83 Al2.17] O40.00 (OH)8.00.

Syntheses of tosudite were made from a starting material which is an interstratified illite-montmorillonite obtained from the same ore body. At 450°C, 400atm., reacting for 5 days, a tosudite-like mineral was synthesized.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 3 , June 1976 , pp. 142 - 148
Copyright
Copyright © 1976 The Clay Minerals Society

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