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This article in SSSAJ

  1. Vol. 32 No. 3, p. 335-340
    Received: June 6, 1967
    Accepted: Jan 9, 1968

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Effect of K+-Uptake by K+-Depleted Micas on the Basal Spacing1

  1. S. B. Weed and
  2. R. A. Leonard2



Potassium was introduced into expanded, i.e., K+-depleted, micas by (i) adding about 0.5 symmetry of KCl to a chromatographic column of expanded mica plus sand and (ii) by equilibrating suspensions of Ca2+ or Mg2+-saturated expanded mica with 0.5, 1.0, 1.5, or 2.0 symmetry of KCl. Two expanded biotites readily formed a regular alternation of 10 and 14A spacings whereas two muscovites did not develop such a phase. A phologopite yielded this phase only at the lowest concentration of K+ tested. Regular alternation developed most readily in the Ca2+-saturated minerals. Development of regular interstratification did not appear to be related to the gross surface-charge-density of the minerals, but did seem to be positively related to the content of octahedral Fe.

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