A Mica/Smectite Interstratified Mineral of the Izushi Toseki, Hyogo Prefecture, Japan
1981 Volume 89 Issue 1027 Pages 119-123
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1981 Volume 89 Issue 1027 Pages 119-123
The Izushi Toseki has been used for Kiyomizu-yaki (a porcelain product in Kyoto). A clay mineral specimen found in it was investigated by mean of chemical, thermal, IR and X-ray analysis.
Chemical composition is: SiO2 54.48%, TiO2 0.06%, Al2O3 29.56%, Fe2O3 1.41%, CaO 0.13%, MgO 0.50%, K2O 6.15%, Na2O 0.36% and Ig. loss 7.80%. In DTA curve, three endothermic peaks at 100°C, 550°C and 680°C were found. In the X-ray diffraction pattern of oriented specimen, three peaks at 10.5Å, 5.09Å and 3.31Å and a weak shoulder at 23Å were recognized.
In the X-ray pattern of randomly oriented specimen treated with E. G., three peaks at 14Å, 10Å and 5.09Å and a shoulder at 26Å were recognized. From these results this mineral found in the Izushi Toseki is a mica/smectite interstratified mineral having 90-70% mica layer and 10-30% smectite layer.
