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