Clays and Clay Minerals

, Volume 44, Issue 5, pp 665–671 | Cite as

Particle Shape versus Coherent Scattering Domain of Illite/Smectite: Evidence from HRTEM of Dolná Ves Clays

  • Vladimír Šucha
  • Jan Srodon
  • Francoise Elsass
  • William J. McHardy


Fundamental particle thickness measurements of Dolná Ves hydrothermal illite/smectite (I/S) samples confirmed earlier findings regarding the content of fixed cations in illite interlayers (ca. 0.9/O10(OH)2). The distributions of fundamental particles and mixed-layer crystals of a given sample are internally consistent. In samples dominated by bilayer fundamental particles, mixed-layer crystals most often contain even numbers of layers. The expandabilities measured by XRD are much higher than so-called minimum expandabilities obtained from HRTEM measurements. This discrepancy is explained by assuming that the coherent scattering domains of Dolná Ves clays do not correspond to natural mixedlayer crystals but are thicker, probably due to parallel association of crystals on the oriented XRD slide. This tendency to produce intercrystal contacts is probably related to the unusually large ab dimensions of crystals of Dolná Ves clays.

Key Words

Coherent scattering domain Fundamental particle HRTEM Illite/Smectite Mixed-layer crystal 


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Copyright information

© The Clay Minerals Society 1996

Authors and Affiliations

  • Vladimír Šucha
    • 1
  • Jan Srodon
    • 2
  • Francoise Elsass
    • 3
  • William J. McHardy
    • 4
  1. 1.Department of Geology of Mineral DepositsComenius UniversityBratislavaSlovakia
  2. 2.Institute of Geological Sciences PANKrakówPoland
  3. 3.Station de Science du Sol INRAVersaillesFrance
  4. 4.The Macaulay Land Use Research InstituteCraigiebuckler, AberdeenUK

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