American Mineralogist, Volume 88, pages 493–500, 2003 O atom sites in natural kaolinite and muscovite: O MAS and 3QMAS NMR study SUNG KEUN LEE* AND JONATHAN F. STEBBINS Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, U.S.A. ABSTRACT The layer silicates are among the most common minerals in the Earth’s surface environment, play important roles in many geological processes, and have diverse technological applications. While it has been suggested that O isotope exchange and dissolution kinetics in aqueous solutions are controlled by chemical bonding and local atomic structures, the effect of atomic environment around O atom sites in clay minerals on their site-specific reactivities with H O are not well known, mainly because direct experimental evidence is lacking. 17 17 Here, we present for the first time detailed high-resolution O NMR data for O-exchanged natural kaolinite [Al Si O (OH) ] and muscovite [KAl (AlSi )O (OH) ] using O triple quantum 2 2 5 4 2 3 10 2 magic angle spinning (3QMAS) and MAS NMR at high fields. At least two basal O atom sites in   kaolinite are resolved: O4, and (O3 + O5). Apical O atoms ( Si-O-2 Al) and hydroxyl
American Mineralogist – de Gruyter
Published: Apr 1, 2003
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