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The Hinckley index for kaolinites

Published online by Cambridge University Press:  09 July 2018

A. Plançon ,
R. F. Giese  and
R. Snyder
A. Plançon
Affiliation:
CRSOCI and Université d'Orleans, 45100 Orleans, France
R. F. Giese
Affiliation:
Department of Geology, State University of New York, 4240 Ridge Lea Road, Amherst, NY 14226
R. Snyder
Affiliation:
New York College of Ceramics, Alfred University, Alfred, NY 14802, USA
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Abstract

The (02,11) X-ray diffraction band from a low-defect kaolinite from Cornwall (Hinckley index HI = 1·22) was examined to determine the defect structure. No combination of interlayer translations and admixing of dickite layers accurately modelled the observed diffraction pattern. Calculated diffraction patterns which gave a good agreement with the shape, position, and intensity of the observed peaks, uniformly had inter-peak intensities which were too weak. By treating the kaolinite as a mixture of low-defect (HI = 1·76) and moderate-defect (HI = 0·29) kaolinites, the agreement between the observed and calculated patterns was improved substantially. The existence of a mixture of two kaolinites was also found for a number of low-defect samples (HI > 0·4) from Georgia and Cornwall, and may be of even wider occurrence. The HI, which is very sensitive to the inner-peak intensities, does not estimate the types or abundances of various structural defects (the classical “crystallinity”), but is related directly, in a non-linear fashion, to the proportions of the two kinds of kaolinite which are present in the sample.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 3 , September 1988 , pp. 249 - 260
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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References

Bookin, A.S., Drits, V.A., Planqon, A. & Tchoubar, C. (1989) Stacking faults in kaolin minerals in the light of real structural features. Clays Clay Miner.(submitted).Google Scholar
Brindley, G.W., Kao, C.-C., Harrison, J.L., Upsicas, M. & Raythatha, R. (1986) Relation between structural disorder and other characteristics of kaolinites and dickites. Clays Clay Miner., 34, 239–249.Google Scholar
Brindley, G.W. & Porter, A.R.D. (1978) Occurrence of dickite in Jamaica: ordered and disordered varieties. Am. Miner., 63, 554–562.Google Scholar
Brindley, G.W., de Souza Santos, P. & de Souza Santos, H. (1963) Mineralogical studies of kaolinite- halloysite clays. Am. Miner., 48, 897–910.Google Scholar
Cline, J., & Snyder, R.L. (1983) The dramatic effect of crystallite size on X-ray diifraction intensities. Adv. X-ray Anal. 26, 111–118 Google Scholar
Drits, V. A. & Kashaev, A.A. (1960) An X-ray study of a single crystal of kaolinite. Soviet Phys. Crystallogr., 5, 207–210.Google Scholar
Hinckley, D.N. (1963) Variability in "crystallinity" values among the kaolin deposits of the coastal plain of Georgia and South Carolina. Clays Clay Miner. 11, 229–235.Google Scholar
Keller, W.D. & Haenni, P. (1978) Effects of micro-sized mixtures of kaolin minerals on properties of kaolinites. Clays Clay Miner., 26, 384–396.Google Scholar
Kakinoki, J. & Komura, J. (1952) Intensity of X-ray diffraction by one dimensionally disordered crystals. J. Phys. Soc. Japan, 7, 30–35.Google Scholar
Mitra, G.B. (1963) Structure defects in kaolinite. Z. Kristallogr., 119, 161–175.CrossRefGoogle Scholar
Mitra, G.B. & Bhattacherjee, S. (1969a) Layer disorder in kaolinite during dehydration. Acta Cryst. B25, 1668–1669.CrossRefGoogle Scholar
Mitra, G.B. & Bhattacherjee, S. (1969b) X-ray diffraction studies on the transformation of kaolinite into metakaolin-I. Variability of interlayer spacings. Am. Miner., 54, 1409–1418.Google Scholar
Murray, H.H. & Lyons, S.C. (1956) Correlation of paper-coating quality with degree of crystal perfection of kaolinite. Clays Clay Miner., 4, 31–40.Google Scholar
Noble, F.R. (1974) A study of disorder in kaolinite. Clay Miner., 9, 71–80.Google Scholar
Plançon, A. (1981) Diffraction by layer structures containing different kinds of stacking faults. J. Appl Cryst., 14, 300–304.Google Scholar
Plançdn, A., Giese, R.F., Drits, V.A. & Bookin, A.S. (1989) The defect structure of kaolinite. (in preparation).Google Scholar
Plançon, A. & Tchoubar, C. (1977a) Determination of structural defects in phyllosilicates by X-ray powder diffraction-I. Principle of calculation of the diffraction phenomenon. Clays Clay Miner., 25, 430–435.Google Scholar
Plançon, A. & Tchoubar, C. (1977b) Determination of structural defects in phyllosilicates by X-ray powder diffraction-II. Nature and proportion of defects in natural kaolinites. Clays Clay Miner., 25, 436–450.Google Scholar
Sakharov, B. A., Nasumov, A.S. & Drits, V.A. (1982) X-ray diffraction by mixed layer structures having abundant distribution of stacking faults. Dokl. Akad. Nauk SSSR, 265, 339–343.Google Scholar
Tchoubar, C., Planqon, A., Ben Brahim Jm Clinard C. & Sow, C. (1982) Caracteristiques structurales des kaolinites desordonnees. Bull. Mineral, 105, 477–491.Google Scholar
Tettenhorst, R.T. & Corbato, C.E. (1986) Properties of a sized and ground kaolinite. Clay Miner., 21, 971–976.Google Scholar