Clay minerals consist of hydrous layer silicates that constitute a large part of the family of phyllosilicates. Clay minerals are particularly abundant in clayey oozes, claystones, mud, mudstones, shales, and argillites, a group of fine-grained rocks called physil rocks by Weaver (1980). Clay minerals also occur in virtually all other types of soft and hard sedimentary rocks, including coarse silicoclastites and saline evaporites. This explains the increased interest on the part of sedimentologists in studying these minerals.


Clay Mineral Layer Charge Layer Type Octahedral Sheet Apical Oxygen 
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© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • Hervé Chamley
    • 1
    • 2
  1. 1.University of Lille IVilleneuve d’AscqFrance
  2. 2.University of Paris VIParis cedex 05France

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