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Soil Science Society of America Journal Abstract -

Interstratification in Vermiculite and Biotite Produced by Potassium Sorption: I. Evaluation by Simple X-ray Diffraction Pattern Inspection1


This article in SSSAJ

  1. Vol. 31 No. 3, p. 366-372
    Received: Sept 2, 1966
    Accepted: Jan 3, 1967

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  1. J. D. Rhoades and
  2. N. T. Coleman2



The formation of mixed-layer minerals occurred upon potassium sorption by sodium or magnesium vermiculites with a change in the interlayer cation composition from the homoionic state to one of varying K/Na or K/Mg proportions. The type of mixing occurring in the vermiculites, as deduced by examination of X-ray diffraction patterns, was similar to that expected for regularly interstratified systems. The same conclusion could not be drawn for the Na- or Mg-biotite material. The effect of particle size on this phenomenon is such that the tendency toward regularity of mixing was greater for the 50 to 74µ than for <2µ materials. It was concluded that it is difficult to distinguish regular from random interstratification in the trioctahedral mica minerals due to coincidence of all but the weakest peaks of the two systems.

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