What is Bentonite?
'''Bentonite''' is a kind of [[clay]]. Bentonite usually forms from [[weathering]] of [[volcanic ash]]. It is volcanic ash mixed with water under pressure. The different types of bentonite have different proportions of [[sodium]], [[calcium]] or [[potassium]]. They can absorb quite a lot of water, and are used as fillers and/or [[lubrication|lubricators]] in various industries. The clay is used for many practical purposes. {{-}} {{sci-stub}} [[Category:Sedimentary rocks]] [[Category:Sodium compounds]] [[Category:Calcium compounds]] [[Category:Potassium compounds]] [[Category:Natural materials]]