Effects of Potassium Removal on the b-Dimension of Phlogopite*

R. A. Leonard and S. B. Weed
Department of Soil Science, North Carolina Agricultural Experiment Station, North Carolina State University, Raleigh, N.C. 27607
* Published with the approval of the Director as Paper No. 2962 of the Journal Series.
Research Soil Scientist USDA, Watkinsville, Georgia 30677 (formerly Instructor, Department of Soil Science, North Carolina State University, Raleigh, North Carolina.
Professor of Soils, North Carolina State University Raleigh, North Carolina

Abstract: Potassium was removed from 5 to 20-µ size fractions of two phlogopites by treatment with sodium tetraphenylboron and replaced with various exchange ions. The b-dimension of the mica increased with K+ removal, which suggests that the K+ ion in phlogopite acts to constrain b. This being the case, the K—O bond in phlogopite must be lengthened and weakened relative to the K—O bond in dioctahedral micas.

Clays and Clay Minerals; November 1970 v. 18; no. 4; p. 197-202; DOI: 10.1346/CCMN.1970.0180403
© 1970, The Clay Minerals Society
Clay Minerals Society (www.clays.org)