The clay swells up by 10 times or more when it absorbs water. When it is mixed with more water, it becomes highly viscous and does not precipitate for a long time. Also, it does not pollute the environment because it is inorganic. What a magical clay! It is bentonite.
Bntonite has unique characteristics not possessed by any other mineral. It is widely used as material in civil engineering, construction, and mining; as a raw material for cosmetics and medical products; and as a deodorizing material for pet litter.