bentonite ivhu yeupfu isiri-yesimbi mamineral ane montmorillonite sechinhu chikuru chemaminerari. Maumbirwo emontmorillonite ndeye 2: 1 mhando kristaro dhizaini inoumbwa nesilicon-oxygen tetrahedroni uye nhete yealuminium-okisijeni octahedron. Kune mamwe makati mune yakarongedzwa chimiro, senge Cu, Mg, Na, K, nezvimwewo, uye kudyidzana kweaya macations ne montmorillonite unit cell haina kugadzikana, uye zviri nyore kuchinjaniswa nemamwe macation, saka ine yakanaka ion kuchinjana. Nyika dzekunze dzakashandiswa mumadhipatimendi anodarika zana munzvimbo makumi maviri nemana dzekugadzirwa kwemaindasitiri nekurima, uye kune zvigadzirwa zvinopfuura mazana matatu, saka vanhu vanozviti "ivhu renyika dzese."