Bentonite ndi mchere wosakhala wachitsulo wokhala ndi montmorillonite ngati gawo lalikulu la mchere. Kapangidwe ka montmorillonite ndi kapangidwe ka kristalo ka mtundu wa 2:1 kopangidwa ndi ma tetrahedrons awiri a silicon oxygen okhala ndi wosanjikiza wa aluminiyamu oxide octahedron. Chifukwa kapangidwe ka magawo komwe kamapangidwa ndi selo la montmorillonite kali ndi ma cations ena, monga Cu, Mg, Na, K, ndi zina zotero, ndipo ntchito ya ma cations awa ndi selo la montmorillonite ndi yosakhazikika, yosavuta kusinthana ndi ma cations ena, ili ndi mphamvu yabwino yosinthira ma ion. Kunja, yagwiritsidwa ntchito m'madipatimenti opitilira 100 m'magawo 24 opanga mafakitale ndi ulimi, yokhala ndi zinthu zoposa 300, chifukwa chake anthu amaitcha "nthaka yapadziko lonse".

Bentonite imadziwikanso kuti bentonite, bentonite, kapena bentonite. China ili ndi mbiri yayitali yopangira ndikugwiritsa ntchito bentonite, yomwe poyamba inkagwiritsidwa ntchito ngati sopo wothira madzi. Panali migodi yotseguka m'dera la Renshou ku Sichuan zaka mazana ambiri zapitazo, ndipo anthu am'deralo ankatcha bentonite kuti ufa wa dongo. Imagwiritsidwa ntchito kwambiri koma ili ndi mbiri ya zaka zoposa zana. Kupezeka koyamba ku United States kunali m'magawo akale a Wyoming. Dongo la chartreuse limatha kukula kukhala phala atawonjezera madzi. Pambuyo pake, anthu adatcha dongo lonse lokhala ndi izi bentonite. Ndipotu, mchere waukulu wa bentonite ndi montmorillonite, wokhala ndi 85-90%. Makhalidwe ena a bentonite amatsimikiziridwanso ndi montmorillonite. Montmorillonite ikhoza kukhala ndi mitundu yosiyanasiyana, monga wobiriwira wachikasu, woyera wachikasu, imvi, woyera, ndi zina zotero. Imatha kupanga mabuloko okhuthala kapena nthaka yotayirira, yokhala ndi kumverera koterera ikakanda ndi zala. Pambuyo powonjezera madzi, kuchuluka kwa mabuloko ang'onoang'ono kumawonjezeka kangapo mpaka nthawi 20-30, kumawonekera ngati wopachikidwa m'madzi, komanso ngati phala pamene madzi ali ochepa. Mtundu wa montmorillonite umagwirizana ndi kapangidwe kake ka mankhwala ndi kapangidwe kake ka mkati.