X-ray studies on bentonites from Kaminoyama, Yamagata Prefecture

Abstract

By the X-ray diffraction charts, bentonites from Kaminoyama, Yamagata Prefecture, are divided in the following four types, (i) montmorillonite, as essential mineral, with a little of zeolite (clino-ptilolite), plagioclase and cristobalite, (ii) zeolite with montmorillorite, plagioclase and cristobalite, (iii) zeolite with montmorillonite, plagioclase, cristobalite and orthoclase, (iv) montmorillonite and celadonite, with zeolite, plagioclase and cristobalite. Type (i) and (ii) distribute widely and type (iv) is a new find one in this area.