- any of a group of clay minerals characterized by the ability to expand when they absorb large quantities of water.
Origin of montmorillonite
1850–55; named after Montmorillon, France, where it was found; see -ite1
Also called smectite.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a clay mineral consisting of hydrated aluminium silicate: an important component of bentonite
C19: named after Montmorillon, French town where it was first found, + -ite 1
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