I-Bentonite iwuhlobo lobumba oluphethwe i-montmorillonite.I-Montmorillonite iyiminerali ye-silicate enezingqimba ehlanganiswe izendlalelo ezimbili ze-Si-O tetrahedron enongqimba lwe-Al-(O,OH) octahedral njengeyunithi yesakhiwo.