Bentonite waa macdan aan bir ahayn oo leh montmorillonite oo ah qaybta macdanta ugu weyn.Qaab dhismeedka montmorillonite waa 2:1 qaab dhismeed crystal ah oo ka kooban laba tetrahedrons silikoon oksijiin iyo lakab aluminium oksijiin octahedron ah.Waxaa jira qaar ka mid ah cations, sida Cu, Mg, Na, K, ee qaabka lakabka ah ee ay sameeyeen unugyada crystal montmorillonite, iyo isdhexgalka ka dhexeeya cations iyo unugyada crystal montmorillonite waa mid aad u deggan, taas oo ay fududahay in lagu beddelo cations kale. ion wanaagsan hantida sarrifka.Wadamada shisheeye ayaa lagu dabaqay in ka badan 100 waaxood oo ku yaal 24 goobood oo wax soo saarka warshadaha iyo beeraha, oo leh in ka badan 300 oo badeecado ah, sidaa darteed dadku waxay ugu yeeraan "carrada caalamiga ah".

Bentonite wuxuu leeyahay darajooyin badan sida:Dhoobada firfircoon, ciidda bleaching dabiiciga ah, bentonite organic, Bentonite ore, Calcium bentonite iyo sodium bentonite.