Bentonite ma'adinai ne maras ƙarfe tare da montmorillonite a matsayin babban ɓangaren ma'adinai.Tsarin montmorillonite wani tsari ne na crystal 2:1 wanda ya ƙunshi tetrahedrons silicon oxygen tetrahedrons da Layer na aluminum oxygen octahedron.Akwai wasu cations, irin su Cu, Mg, Na, K, a cikin tsarin da aka tsara ta hanyar sel crystal montmorillonite, kuma hulɗar da ke tsakanin waɗannan cations da ƙwayoyin kristal na montmorillonite ba shi da kwanciyar hankali, wanda ke da sauƙin musanya ta wasu cations Yana da kyau ion musayar dukiya.An yi amfani da ƙasashen waje a cikin fiye da sassan 100 a fannoni 24 na masana'antu da noma, tare da samfurori fiye da 300, don haka mutane suna kiranta "ƙasar duniya".

Bentonite yana da maki da yawa kamar:Laka mai aiki, Ƙasar bleaching na halitta, Organic bentonite, Bentonite ore, Calcium bentonite da sodium bentonite.