The Bentonite reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Bentonite

Bentonite is an absorbent aluminum silicate clay formed from volcanic ash that expands when wet and used to make slurry walls.

It can be used in cement, adhesives, and ceramic fillers. It is named after Benton Formation (at one time Fort Benton Formation) in eastern Wyoming's Rock Creek area.

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