bentonite

noun

ben·ton·ite | \ ˈben-tə-ˌnīt

Definition of bentonite

: an absorptive and colloidal clay used especially as a sealing agent or suspending agent (as of drugs)

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Waste will be sealed in the copper coffins, placed into the storage shafts, and surrounded by a thick layer of bentonite, a natural clay almost impermeable to water. — Tim Heffernan, Popular Mechanics, "Finland's Crazy Plan to Make Nuclear Waste Disappear," 10 May 2012 This mask is made with a blend of charcoal, volcanic ash, and kaolin and bentonite clays to remove impurities, exfoliate, absorb excess oils, remove toxins, and reduce inflammation. — Tanisha Pina, Allure, "This K-Beauty Brand Just Launched at Walmart and Products Are Already Selling Out," 1 Aug. 2018 Our pomades contain pure ingredients such as bentonite, which is mineral enriching for the hair, and hydrogenated castor oil, which works as a non-sticky wax to hold shape. — Scott Christian, Esquire, "One of New York's Coolest Clothing Brands Wants You to Have Great Looking Hair," 3 Mar. 2017 Officials suspect the bentonite seeped into groundwater supplies, causing the water wells to become cloudy. — Andrew Maykuth, Philly.com, "Sunoco resumes drilling Mariner East pipeline in Chester County," 8 July 2017 Local officials suspect that nontoxic bentonite clay used as a lubricant during the horizontal-drilling process may have migrated into private wells. — Andrew Maykuth, Philly.com, "Water-contamination complaints force Sunoco to suspend Chesco pipeline construction," 7 July 2017 In a memo to the mayor, aldermen and city administrator, Deal said staff members have been using bentonite, an absorbent clay, to stop the leaks temporarily. — Kaitlyn Schwers, kansascity.com, "No muskrat love after city discovers leaking spillways, damage to dams," 28 June 2017

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