Sodium bentonite

The most common use of bentonite is in drilling fluids. The bentonite in the flush fluid lubricates and cools the cutting tools while protecting against corrosion. As the drilling fluid generates hydrostatic pressure in the borehole, it hinders fluid and gas penetration.

Other uses:

foundry, water purification, agriculture, tile, paper production,cat litter, detergents, color and Lacquer