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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%, A120~ 36.40%, Fe203 1.82%, MgO 0.29%, CaO 0.38%, Li20 1.04%, Na20 0-14%, K20 0.38%, H20 + 11'12% and H20-6.87% from the chemical composition of a specimen with associated impurities. The Li-bearing tosudite has the regularly interstratified structure of montmorillonite and dioctahedral chlorite indoi:10.1346/ccmn.1975.0230501 fatcat:q2pjee6cmff4vgykcllsvh2gda