Effect of K+-Uptake by K+-Depleted Micas on the Basal Spacing
1968
Weed, S. B. | Leonard, R. A.
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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