Lithium-Bearing Tosudite

Tsutomu Nishiyama, Susumu Shimoda*, Koya Shimosaka and Shigeto Kanaoka
Natural Science Laboratory, Toyo University, Tokyo, Japan
* Geological and Mineralogical Institute, Faculty of Science, Tokyo University of Education, Tokyo, Japan.
Geological Survey of Japan, Nagoya, Japan.
Government Industrial Research Institute, Nagoya, Japan.

abstract: Lithium-bearing tosudite was found from a brittle clayey part of the Tooho “roseki” deposit, Aichi Prefecture, Japan. The chemical composition of the Li bearing tosudite was estimated as SiO2 41·60%, Al2O3· 36·40%, Fe2O3 1·82%, MgO 0·29%, CaO 0·38%, Li2O 1·04%, Na2O 0·14%, K2O 0·38%, H2O+ 11·12% and H2O 6·87% from the chemical composition of a specimen with associated impurities. The Li-bearing tosudite has the regularly interstratified structure of montmorillonite and dioctahedral chlorite in which Li is present in a gibbsite sheet as shown in the structural formula of interlayer cations K0·16, Na0·09, Ca0·13 + 9·60 H2O; gibbsite sheet Li1·36, Mg0·14, Fe0·45, Al3·59 (OH)12·00; silicate layer Al8·00 (Si13·60, Al2·40) O40·00 (OH) 8·00. The 29·48 Å reflection series of the Li-bearing tosudite moves to 31·3 Å after ethylene glycol treatment and to 23·3 Å on heating to 500°C for 1 hr.

Clays and Clay Minerals; November 1975 v. 23; no. 5; p. 337-342; DOI: 10.1346/CCMN.1975.0230501
© 1975, The Clay Minerals Society
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