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Tshwj xeeb heev gel organic bentonite rau drilling kua
Bentonite yog ib hom av nplaum uas yog montmorillonite.Montmorillonite yog txheej txheej silicate ntxhia muaj li ntawm ob txheej ntawm Si-O tetrahedron nrog ib txheej ntawm Al-(O, OH) octahedral ua ib chav tsev.
