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This article in SSSAJ

  1. Vol. 31 No. 3, p. 372-377
    Received: Oct 17, 1966
    Accepted: Feb 13, 1967

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Interstratification in Vermiculite and Biotite Produced by Potassium Sorption: II. Evaluation by One-Dimensional Fourier Analysis1

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



The one-dimensional Fourier analysis was applied to the determination of the distribution of sorbed potassium in initially magnesium- or sodium-saturated South African vermiculite and Bancroft biotite. It was concluded that while the type of interstratification produced through K sorption by vermiculite was not entirely regular, there was a definite trend in that direction. The biotite sample, on the other hand, apparently underwent zonal segregation upon K sorption when the complementary cation was Mg, whereas random interstratification seemed to be the case for the analogous Na system. Difficulties encountered in the use of this approach were discussed in terms of “skewness” and obscuration of X-ray diffraction peaks and the apparent intermixing of interstratification types obtained. Information gained from the Fourier analysis was used to speculate on reasons for the observed distribution of K in the materials.

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