Letter | Published:

Synthesis of a quasi-stable kaolinite and heat capacity of interlayer water

Nature volume 296, pages 549551 (08 April 1982) | Download Citation



The mineral halloysite, in its hydrated and dehydrated forms, has attracted much attention1 but, in spite of much careful X-ray and electron diffraction work, and electron microscopy, NMR and IR spectroscopic studies, there remain many questions about the crystal structure of the layers, their stacking, as well as the position, motion and bonding of the water molecules (in the hydrated form) to each other and to the surrounding silicate layers. The difficulties associated with studying halloysites are principally due to the great variability observed in natural samples2 and, in the hydrated form, the existence of substantial amounts of pore water in addition to interlayer water. We have attempted to simplify the former difficulty by synthesizing a 10-Å hydrate similar to halloysite-10 Å (ref. 3) starting with a well characterized, crystalline kaolinite from Georgia. Here we report the successful synthesis of a 10-Å hydrate which is stable at reduced temperatures and contains no pore water. With this material we have measured Cp for the interlayer water between 110 and 270 K.

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  1. Department of Geological Sciences, State University of New York, 4240 Ridge Lea Road, Amherst, New York 14226, USA

    • P. M. Costanzo
    •  & R. F. Giese Jr
  2. Schlumberger-Doll Research, Ridgefield, Connecticut 06877, USA

    • M. Lipsicas
    •  & C. Straley


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