Effect of K+-Uptake by K+-Depleted Micas on the Basal Spacing1
- S. B. Weed and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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