Clays and Clay Minerals

, Volume 44, Issue 2, pp 191–196 | Cite as

Why Does Halloysite Roll?—A New Model

  • Balbir Singh


A model is presented to explain why tubular halloysite rolls in preference to tetrahedral rotation to correct misfit of the octahedral and tetrahedral sheets. It is shown that the rolling mechanism operates as it encounters significantly less resistance from Si-Si repulsion in comparison to tetrahedral rotation to correct the same amount of misfit. The model explains the observed and experimental rolling of planar kaolinites to form tubular halloysite upon hydration and exfoliation.

Key Words

Coulomb repulsion Kaolinite Rolling Tetrahedral rotation Tubular Halloysite 


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Copyright information

© The Clay Minerals Society 1996

Authors and Affiliations

  • Balbir Singh
    • 1
  1. 1.Centre for Microscopy and MicroanalysisThe University of QueenslandBrisbaneAustralia

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