Significance of Kaolinite Intersalation in Clay Mineral Analysis

M. L. Jackson
Department of Soils, University of Wisconsin Madison, Wisconsin

Abstract: Recent development of the intersalation method by which kaolinite (as well as dickite and halloysite) is expanded makes possible the application of X-ray diffraction to qualitative and semiquantitative determinations of these mineral species. It also permits their distinction from the X-ray-thermally similar intergradient 2:1–2:2 layer silicates which are not affected by the treatment. Intergradient 2:1–2:2 layer silicates are developed by interlayer precipitation of hydroxides of aluminum, iron, and magnesium during pedogeochemical weathering and probably also during burial in sediments. The quantitative determination of kaolinite-halloysite by NaOH differential dissolution is completely corroborated by the qualitative, semiquantitative X-ray diffraction intersalation technique with respect to their clear differentiation from chlorite and intergradient clays.

Clays and Clay Minerals; 1960 v. 9; no. 1; p. 424-430; DOI: 10.1346/CCMN.1960.0090130
© 1960, The Clay Minerals Society
Clay Minerals Society (www.clays.org)