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Bentonite: A soft, plastic, porous, light-colored rock composed essentially of clay minerals of the montmorillonite group plus colloidal silica, and produced by devitrification and accompanying chemical alteration of a glassy igneous material. (Definition from Jackson, J.A., ed., 1997, Glossary of geology [4th ed.]: Alexandria, Va., American Geological Institute, 769 p.)

 

 

 

 

 

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Last modified September 12, 2008 .