Bentonite ndi mchere wopanda chitsulo wokhala ndi montmorillonite monga gawo lalikulu la mchere.Mapangidwe a montmorillonite ndi mawonekedwe a kristalo a 2: 1 wopangidwa ndi ma silicon oxygen tetrahedron ndi wosanjikiza wa aluminiyamu okosijeni octahedron.Pali ma cations, monga Cu, Mg, Na, K, mu mawonekedwe osanjikiza omwe amapangidwa ndi maselo a kristalo a montmorillonite, ndipo kugwirizana pakati pa ma cations ndi maselo a crystal a montmorillonite ndi osakhazikika, omwe ndi osavuta kusinthanitsa ndi ma cations ena. katundu wabwino wa ion.Mayiko akunja agwiritsidwa ntchito m'madipatimenti opitilira 100 m'magawo a 24 opanga mafakitale ndi ulimi, okhala ndi zinthu zopitilira 300, kotero anthu amachitcha "nthaka yapadziko lonse lapansi".

Bentonite ili ndi magulu ambiri monga:Dongo logwira ntchito, Dothi loyera lachilengedwe, Organic bentonite, Bentonite ore, Calcium bentonite ndi sodium bentonite.