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a. Metamorphosed, altered, or somewhat indurated bentonite; characterized
by clay minerals (esp. illite) that no longer have the property of
absorbing or adsorbing large quantities of water; nonswelling bentonite,
or bentonite that swells no more than do ordinary clays. The term has been
applied to certain Ordovician clays of the Appalachian region and upper
Mississippi River Valley. See also: potassium bentonite
b. A mineral of the montmorillonite group with SiO2 layers in the
montmorillonite structure. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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