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Science 5 February 1965:
Vol. 147. no. 3658, pp. 603 - 605
DOI: 10.1126/science.147.3658.603
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Articles

Potassium Content of Illite

Charles E. Weaver 1

1 Georgia Institute of Technology, Atlanta

The average potassium oxide content of 18 Paleozoic two-layer monoclinic illites is 8.75 percent. There is an excellent linear relation between the ratio of the intensities of the reflections at 10 angstroms and 5 angstroms (10 Å/5 Å) and the potassium oxide content. The frequency distribution curve of the 10 Å/5 Å intensity ratio of 249 Paleozoic illite-rich shales is approximately normal. The modal value is 2.0, equivalent to 9.3 percent potassium oxide, and the average ratio is 2.47, equivalent to approximately 8.5 percent potassium oxide. The illite layers of many of the mixed layer illites-montmorillonites have from 8 to 10 percent potassium oxide. With a minimum number of assumptions realistic structural formulas for the two members of a mixed-layer illite-montmorillonite can be calculated.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
THE CHARGE OF COMPONENT LAYERS OF ILLITE-SMECTITE IN BENTONITES AND THE NATURE OF END-MEMBER ILLITE.
J. Srodon, E. Zeelmaekers, and A. Derkowski (2009)
Clays and Clay Minerals 57, 649-671
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