bentonite av nplaum hmoov yog cov ntxhia uas tsis yog xim hlau nrog montmorillonite ua cov ntxhia tseem ceeb. Cov qauv ntawm montmorillonite yog 2: 1 hom siv lead ua qauv tsim los ntawm ob lub silicon-oxygen tetrahedrons thiab txheej ntawm aluminium-oxygen octahedrons. Muaj qee qhov cations hauv cov txheej txheem txheej, xws li Cu, Mg, Na, K, thiab lwm yam, thiab kev sib cuam tshuam ntawm cov cations no nrog montmorillonite chav nyob ntawm tes tsis ruaj khov, thiab nws yooj yim pauv los ntawm lwm cov cations, yog li nws muaj kev sib pauv ion zoo. Lub teb chaws txawv teb chaws tau thov hauv ntau dua 100 lub tuam tsev hauv 24 thaj tsam ntawm kev tsim khoom lag luam thiab kev ua liaj ua teb, thiab muaj ntau dua 300 yam khoom, yog li tib neeg hu nws tias "av thoob ntiaj teb."