Interstratification in Vermiculite and Biotite Produced by Potassium Sorption: I. Evaluation by Simple X-ray Diffraction Pattern Inspection1
- J. D. Rhoades and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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