There are several types of bentonites, also known as Montmorillonite. Generally, the sodium bentonite is used in metallurgy industry or in the oil industry for drilling.
Livestock uses either sodium or calcium bentonite as a pelletizing and anticaking agent to level the pH of the animals digestive system, as well as an adsorbent of certain range of mycotoxins.
In agriculture CALCIUM BENTONITE is most oftenly employed as soil amendment to conserve moisture and level the sodium/calcium ratio. Bentonite is - same as a zeolite - a powerful cation exchanger, only unlike this, its laminar structure expands when in contact with water, hence the use of bentonites is only recommended for highly permeable or sand soils.