Bentonite

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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Notion

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Science and technology

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What Wikipedia says

Bentonite ( BEN-tə-nyte) is an absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite. Na-montmorillonite has a considerably greater swelling capacity than Ca-montmorillonite.

Excerpt from the Wikipedia article “Bentonite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: James St. John (https://www.flickr.com/people/jsjgeology/), CC BY 2.0, via Wikimedia Commons.