Dehydration of Fully Hydrated Halloysite from Lawrence County, Indiana1

Jack L. Harrison and Seymour S. Greenberg
Indiana Geological Survey, Bloomington, Indiana
1 Published with permission of the State Geologist, Indiana Department of Conservation, Geological Survey.

Abstract: The changes occurring in fully hydrated halloysite during dehydration have been studied by X-ray diffraction at relative humidities that ranged from 0 to 100 percent. From the results of this study it has been concluded that: (1) layers dehydrate randomly, but instantaneously; (2) the diffraction from an individual crystallite is governed by the ratio of hydrated to dehydrated layers present; and (3) halloysite dehydrated to any degree shows no detectable rehydration when exposed to 100 percent relative humidity for 2 months.

Clays and Clay Minerals; 1960 v. 9; no. 1; p. 374-377; DOI: 10.1346/CCMN.1960.0090124
© 1960, The Clay Minerals Society
Clay Minerals Society (www.clays.org)