MINERALOGICAL STUDIES OF KAOLINITE-HALLOYSITE CLAYS: PART 3. A FIBROUS KAOLIN MINERAL FROM PIEDA DE SAO PAULO BRAZIL

An unusual form of kaolin mineral filling cracks in weathered prophyritic granite in the county of Piedade, Sao Paulo, Brazil, consists of visibly fibrous material which, in the electron microscope, appears as thin tubular fibers of considerable length; platy particles are almost entirely absent. X-ray rotation diagrams of dried fiber bundles and selected area electron diffraction patterns of single fibers show an appreciable degree of structural regularity in the kaolin layer structure, with b as the fiber axis. The results show general agreement with previous data by Honjo, Kitamura and Mihama. Prior to drying, the material as collected can be described as consisting of two-thirds endellite and one-third halloysite. The endellite component has the swelling and shrinking behavior characteristic of this mineral with respect to ethylene glycol, water, and gentle heat treatments. This may be the first observation of a mineral of endellite-halloysite type existing in a directly visible fibrous form. /Author/

  • Corporate Authors:

    Mineralogical Society of America

    1707 L Street, NW
    Washington, DC  USA  20036
  • Authors:
    • De Souza Santos, H
    • Brindley, G W
    • De Souza Santos, P
  • Publication Date: 1965-6

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 619-628
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00264183
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 9 1975 12:00AM