Abstract
With a view to determine their mineralogical nature, X-ray and differential thermal studies were carried out on six Indian bentonites from Bihar, Rajula, Akli, Hathi-ki-dhani, Jaipur and Karauli. All the deposits were found to contain montmorillonite in addition to other minerals. The DTA curves showed the presence of kaolinite in Bihar, Akli and Hathi-ki-dhani bentonites. Jaipur and Karauli bentonites were found to contain clay minerals in which illtie and montmorillonite were found to be interstratified.