Clays and Clay Minerals

, Volume 34, Issue 3, pp 323–329 | Cite as

Quantification Curves for the X-Ray Powder Diffraction Analysis of Mixed-Layer Kaolinite/Smectite

  • Katsutoshi Tomita
  • Hidewo Takahashi


X-ray powder diffraction patterns for many interstratified kaolinite/glycolated smectites were calculated by changing combinations of probabilities and transition probabilities of two component layers. Reichweite = 0 and Reichweite = 1 structures were investigated. The calculated d-values were plotted, with PKS (the probability that a smectite layer succeeds a kaolin layer given that the first layer is a kaolinite layer) and PSK as the axes of coordinates. These d-values were then linked into equal d-value curves on a graph. Four equal d-value diagrams for mixed reflections ranging from 34.0 to 17.1 Å, from 8.5 to 7.2 Å, from 6.13 to 5.68 Å, and from 3.540 to 3.401 Å were constructed. Two examples of identifying natural kaolinite/smectite minerals using these diagrams are presented.

Key Words

Ethylene glycol Interstratification Kaolinite/smectite Mixed-layer quantification X-ray powder diffraction 


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  1. Akai, J. (1974) Some examples of weathering product of montmorillonite: J. Mineral. Soc. Japan 11, 87–92 (in Japanese).Google Scholar
  2. Altschuler, Z. S., Dwornik, E. J., and Kramer, H. (1963) Transformation of montmorillonite to kaolinite during weathering: Science 141, 148–152.CrossRefGoogle Scholar
  3. Cradwick, P. D. and Wilson, M. J. (1978) Calculated X-ray diffraction curves for the interpretation of a three-component interstratified system: Clay Miner. 13, 53–65.CrossRefGoogle Scholar
  4. Kakinoki, J. and Komura, Y. (1965) Diffraction by a one-dimensionally disordered crystal. I. The intensity equation: Acta Crystallogr. 19, 137–147.CrossRefGoogle Scholar
  5. Kohyama, N. and Shimoda, S. (1974) On a few specimens called mixed layer kaolinite-montmorillonite: comparisons of observed and calculated X-ray diffraction patterns: J. Mineral. Soc. Japan 11, 99–106 (in Japanese).Google Scholar
  6. Reynolds, R. C. (1980) Interstratified clay minerals: in Crystal Structures of Clay Minerals and Their X-ray Identification, G. W. Brindley and G. Brown, eds., Mineralogical Society, London, 249–303.Google Scholar
  7. Reynolds, R. C. (1983) Calculation of absolute diffraction intensities for mixed-layered clays: Clays & Clay Minerals 31, 233–234.CrossRefGoogle Scholar
  8. Sakharov, B. A. and Drits, V. A. (1973) Mixed-layer kaolinite-montmorillonite: a comparison of observed and calculated diffraction patterns: Clays & Clay Minerals 21, 15–17.CrossRefGoogle Scholar
  9. Sato, M. (1973) X-ray analysis of interstratified structure: Nendo Kagaku 13, 39–47 (in Japanese).Google Scholar
  10. Sato, M. and Kizaki, Y. (1972) Structure of a 38-Å interstratified mineral, an illite-montmorillonite mixture: Z. Kristallogr. 135, 219–231.CrossRefGoogle Scholar
  11. Schultz, L. G., Shepard, A. D., Blackmon, P. D., and Starkey, H. C. (1971) Mixed-layer kaolinite-montmorillonite from the Yukatan Peninsula, Mexico: Clays & Clay Minerals 19, 137–150.CrossRefGoogle Scholar
  12. Shimoyama, A., Johns, W. D., and Sudo, T. (1969) Montmorillonite-kaolin clay in acid clay deposits from Japan: in Proc. Int. Clay Confer. Tokyo, 1969, Vol. 1, L. Heller, ed., Israel Univ. Press, Jerusalem, 225–231.Google Scholar
  13. Środoń, J. (1980) Synthesis of mixed-layer kaolinite/smectite: Clays & Clay Minerals 28, 419–424.CrossRefGoogle Scholar
  14. Sudo, T. and Hayashi, H. (1956) A randomly interstratified kaolin-montmorillonite in acid clay deposists in Japan: Naturelle, 1115–1116.Google Scholar
  15. Takahashi, H. (1982) Electronic computer’s program for calculation of diffracted intensity by close-packed structures with stacking faults: Bull. Fac. Educ. Kagoshima Univ. 34, 1–14 (in Japanese).Google Scholar
  16. Tomita, K. and Takahashi, H. (1985) Curves for the quantification of mica/smectite and chlorite/smectite interstratifications by X-ray powder diffraction: Clays & Clay Minerals 33, 379–390.CrossRefGoogle Scholar
  17. Tsuzuki, Y. and Sato, M. (1974) Some structure models of kaolin/montmorillonite random mixed-layer minerals: J. Mineral. Soc. Japan 11, 106–110 (in Japanese).Google Scholar
  18. Urabe, K., Udagawa, S., and Hayashi, T. (1979) Synthesis of kaolin-montmorillonite mixed layer minerals: J. Mineral. Soc. Japan 14, 146–161 (in Japanese).Google Scholar
  19. Wiewiora, A. (1971) A mixed layer kaolinite-smectite from lower Silesia, Poland: Clays & Clay Minerals 19, 415–416.CrossRefGoogle Scholar
  20. Wiewiora, A. (1973) Mixed-layer kaolinite-smectite from lower Silesia, Poland: final report: in Proc. Int. Clay Conf., Madrid, 1972, Vol. 1, J. M. Serratosa, ed., Div. Ciencias C.S.I.C, Madrid, 101–116.Google Scholar

Copyright information

© The Clay Minerals Society 1986

Authors and Affiliations

  • Katsutoshi Tomita
    • 1
  • Hidewo Takahashi
    • 2
  1. 1.Institute of Earth Sciences, Faculty of ScienceKagoshima UniversityKagoshimaJapan
  2. 2.Department of Geology, Faculty of EducationKagoshima UniversityKagoshimaJapan

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