THE SURFACE REACTIVITY OF MICAS

Analyzed specimens of muscovite, rose muscovite, margarite, phlogopite, lepidomelane, biotite, and a mica-vermiculite were used. Elements released upon treatment with dilute hydrochloric acid and water were determined. The relationships of K, Na, Ca, Mg, Al, Fe, and monomeric silicic acid in solution to final pH were studied. The release of K, Na, and Ca was pH-independent over a considerable range. The pH values attained were to low to account for the K, Na, or Ca by Donnan hydrolysis alone. Some polymeric or highly colloidal silicates or alumino-silicate anion is presumed to exist in solution. For Mg, Al, and Fe the curves were compared with the solubility-product relationships of the hydroxides. No correspondence was found; the mica curves gave much smaller slopes. Mg, Al, and Fe were reincorporated into the silicate structures as the pH rose. The curves for monomeric silica released did not resemble that for amorphous silica; hence silica was also re-incorporated. The effects of order of treatments upon the exchange properties of mica surfaces were found to be small. /Author/

  • Corporate Authors:

    Williams and Wikins Company

    428 East Preston Street
    Baltimore, MD  USA  21202
  • Authors:
    • Marshall, C E
    • McDowell, L L
  • Publication Date: 1965-2

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 115-131
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00264517
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 29 1975 12:00AM