Clays and Clay Minerals

, Volume 23, Issue 2, pp 97–102 | Cite as

Swelling Chlorite in a Soil of the Dominican Republic

  • C. I. Rich
  • Juan A. Bonnet


A 1–0·2 μm fraction from a soil in the Dominican Republic was studied by X-ray diffraction combined with solvation, cation saturation, and heat treatments. I.R., thermal (DTA, TGA) and chemical analyses were also made. This soil is saline and alkaline and its mineral composition is greatly influenced by the lacustrine parent material and poor drainage.

In addition to swelling chlorite, illite, kaolinite, carbonates and quartz are present in the 1–0·2 μm fraction. The swelling chlorite expanded to over 18 Å when Mg saturated and solvated with glycerol or water. Lower spacings with other cations and ethylene glycol were observed. 1 N HCl treatment partially removed the interlayer hydroxides in the chlorite and 6 N HCl destroyed the mineral. The mineral gave a reflection close to 14 Å up through 600°C but collapsed at higher temperatures to 10·2 Å.


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  1. Bernas, B. (1968) A new Method for decomposition and comprehensive analysis of silicate by atomic absorption spectrometry: Anal. Chem. 40, 1682–1686.CrossRefGoogle Scholar
  2. Bradley, W. F. (1953) Analysis of mixed-layer clay mineral structures: Anal Chem. 25, 727–730.CrossRefGoogle Scholar
  3. Brindley, G. W. (1961) Chlorite minerals. In The X-ray identification and crystal structures of clay minerals (Edited by Brown, G.), pp. 242–296. Mineralogical Society, London.Google Scholar
  4. Honeyborne, D. B. (1951) Clay minerals in the Keuper marl: Clay Miner. Bull., 1, 150–155.CrossRefGoogle Scholar
  5. Lippmann, F. (1956) Clay minerals from the roth member of the triassic near Gottingen, Germany: J. sedim. Petrol. 26, 125–129.CrossRefGoogle Scholar
  6. Martin Vivaldi, J. L. and MacEwan, D. M. C. (1960) Corrensite and swelling chlorite: Clay Miner. Bull. 4, 173–181.CrossRefGoogle Scholar
  7. Reichen, L. E. and Fahey, J. J. (1962) An improved method for the determination of FeO in rocks and minerals including garnet: Contr. Geochem., U.S. Geological Survey Bull. 1144-b.Google Scholar
  8. Rich, C. I. (1957) Determination of the (060) reflections of clay minerals by means of a counter type X-ray diffraction instrument: Am. Miner. 42, 569–570.Google Scholar
  9. Rich, C. I. (1961) Calcium determination for cation-exchange measurements: Soil Sci. 92, 226–231.CrossRefGoogle Scholar
  10. Rich, C. I. (1969) Suction apparatus for mounting clay specimens on ceramic tile for X-ray diffraction: Soil Sci. Soc. Am.Proc. 33, 815–816.CrossRefGoogle Scholar
  11. Shimoda, S. (1970) An expandable chlorite-like mineral from the Hanaoka mine, Akia Prefecture, Japan: Clay Miner. Bull. 3, 352–360.CrossRefGoogle Scholar
  12. Stephen, I. and MacEwan, D. M. C. (1951) Some chloritic clay minerals of unusual type: Clay Miner. Bull. 1, 157–161.CrossRefGoogle Scholar

Copyright information

© The Clay Minerals Society 1975

Authors and Affiliations

  • C. I. Rich
    • 1
    • 2
  • Juan A. Bonnet
    • 1
    • 2
  1. 1.Agronomy DepartmentVirginia Polytechnic Institute and State UniversityBlacksburgUSA
  2. 2.Soils Department, Agricultural Experiment StationUniversity of Puerto RicoRio PiedrasPuerto Rico

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