bentonite

Etymology
From, after the place where it was first mined: , Montana.

Noun

 * 1)  Any of several impure clay minerals consisting mostly of montmorillonite.
 * 2) A porous clay formed by the decomposition of volcanic ash that swells 5 to 6 times its original volume in the presence of water.

Synonyms

 * when used as an anti-caking agent

Translations

 * Catalan: bentonita
 * Dutch:
 * Finnish:
 * French:
 * Italian:
 * Polish: