Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An absorbent aluminum silicate clay formed from volcanic ash and used in various adhesives, cements, and ceramic fillers.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. an absorbent aluminum silicate clay formed from volcanic ash.

from The Century Dictionary and Cyclopedia

  • n. A variety of clay occurring extensively in the Fort Benton strata of the Cretaceous of Wyoming.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an absorbent aluminum silicate clay formed from volcanic ash

Etymologies

After Benton Formation (formerly Fort Benton Formation) of the Rock Creek district in eastern Wyoming.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Benton +‎ -ite, after the place it was first mined: Fort Benton, Montana. (Wiktionary)

Examples

  • Bentonite is a primary montmorillonite clay mined in the U.S.A., but the term bentonite is often used for other commercial montmorillonite clays as well.

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  • Sodic bentonite is a type of clay that swells to many times its dry volume when wet.

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  • Second, there is an additive in that anthrax, bentonite, which is used to cause the anthrax to not stick together, and float in the air.

    Hullabaloo

  • Some investigators think a clay called bentonite was used in the process.

    I Need Scientists!

  • Most conventional cat litter is made from natural clay, or sodium bentonite, which is formed into pellets and dried.

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  • Surround containers with an impermeable backfill such as bentonite clay if the repository is wet.

    Nuclear waste management

  • HEMMER: We've been trying for a couple of days, tossing around this word "bentonite," Major Garrett talked about, this morning, the White House saying it was not present.

    CNN Transcript Oct 29, 2001

  • Please do not confuse Pascalite with ordinary clays such as bentonite clay, Jordan clay or French green clay.

    Wil's Ebay E-Store

  • This filtering, aka fining, is typically performed with fish-bladder isinglass or egg whites, although some companies now choose vegan alternatives such as bentonite clay, silica gel, diatomaceous earth and Irish moss, a seaweed product also known as carrageenan.

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  • There are many concrete repair products out there, but my personal favorite for this situation is a powder that contains Portland cement, bentonite clay and some other ingredients that cause the patching material to harden and expand at the same time.

    How to fix holes in your home's concrete foundation

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