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Hydrogen-Isotope Exchange in Halloysite: Insight from Room-Temperature Experiments

Published online by Cambridge University Press:  28 February 2024

Jean C. C. Hsieh  and
Crayton J. Yapp
Jean C. C. Hsieh
Affiliation:
Department of Geological Sciences, Southern Methodist University, Dallas, Texas 75275-0395, USA
Crayton J. Yapp*
Affiliation:
Department of Geological Sciences, Southern Methodist University, Dallas, Texas 75275-0395, USA
*
E-mail of corresponding author: cjyapp@mail.smu.edu
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Extract

Halloysite is a common pedogenic clay mineral, often found in young soils developed on volcanic deposits (Dixon, 1989), It is a member of the kaolin group of clays with the same ideal stoichiometric composition as kaolinite [Al2Si2O5(OH)4]. Halloysite, however, often contains water of hydration (i,e., Al2Si2O5(OH)4·nH2O), and is commonly found with a tubular morphology, This “rolling” of halloysite has received a great deal of study because there is no generally agreed upon mechanism for the process and there is no corresponding phenomenon in natural kaolinite (e.g. , Bates et al., 1950; Bailey, 1989; Singh, 1996; Singh and Mackinnon, 1996). The crystal structure of halloysite often shows stacking disorder. This property, combined with a rolled morphology, makes identification by X-ray diffraction (XRD) difficult. The XRD peaks at 7.5, 4.4, and 3.6 Å are often asymmetric with a large width at half peak height (Bailey, 1989).

Keywords

DehydrationEquilibriumHalloysiteHydrogen IsotopesIsotopic ExchangeSoils
Type
Note
Information
Clays and Clay Minerals , Volume 47 , Issue 6 , December 1999 , pp. 811 - 816
Copyright
Copyright © 1999, The Clay Minerals Society

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