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Recognition of intermediates in the possible transformation of halloysite to kaolinite in weathering profiles

  • G. J. Churchman (a1) and R. J. Gilkes (a1)

The kaolin minerals in lateritic weathering profiles on dolerite and granite in Western Australia have been characterized by intercalation tests for halloysites, and also by their particle morphologies. Towards the surface of the profiles there is a decrease in both total kaolin mineral content, and in the expandibility of those minerals to intercalation. Tubular kaolinite that is non-expandible by any of the intercalation tests for halloysite was identified in the upper few metres of both profiles. Hydrated halloysite is most common at the base of both profiles. Formamide expands some anhydrous kaolin minerals while the sequence of hydrazine/water/glycerol (HWG) expands more of these minerals. Non-tubular (subhedral to sub-hexagonal platy) kaolinite is also present. Hydrated tubular halloysite apparently alters to tubular kaolinite via dehydrated halloysite that is expandible by formamide and a tubular ‘kaolin’ that is expandible by HWG but not by formamide.

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Anand, R.R. & Gilkes, R.J. (1984) Weathering of hornblende, plagioclase and chlorite in meta-dolerite, Australia. Geoderma, 34, 261–280.
Anand, R.R., Gilkes, R.J. Armitage, T.M. & Hillyer, J.W. (1985) Feldspar weathering in lateritic saprolite. Clays Clay Miner., 33, 31–43.
Brindley, G.W. (1961) Kaolin, serpentine and kindred minerals. Pp. 51-131 in: The X-ray Identification and Crystal Structures of Clay Minerals (Brown, G., editor). Mineralogical Society, London.
Brindley, G.W. & Robinson, K. (1946) Randomness in the structure of kaolinitic clay minerals. Trans. Farad. Soc. 42B, 198–205.
Brindley, G.W. & Souza Santos, P. de (1966) New varieties of kaolin group minerals and the problem of finding a suitable nomenclature. Proc. Int. Clay Conf. Jerusalem, 1, 39.
Churchman, G.J. (submitted) The possible transformation of halloysite to kaolinite in soil profiles as indicated by intercalation tests. Clays Clay Miner,(submitted).
Churchman, G.J. & Carr, R.M. (1975) The definition and nomenclature of halloysites. Clays Clay Miner., 23, 382–388.
Churchman, G.J., Whitton, J.S., Claridge, G.G.C. & Theng, B.K.G. (1984) Intercalation method using formamide for differentiating halloysite from kaolinite. Clays Clay Miner., 32, 241–248.
Gilkes, R.J. & Suddhiprakarn A. (1979) Biotite alteration in deeply weathered granite. I. Morphological, mineralogical, and chemical properties. Clays Clay Miner., 27, 349–360.
McCrea, A.F. (1987) Physical and mineralogical properties of lateritic pallid zone. MSc thesis, Univ. W. Australia.
Mulcahy, M.J. (1960) Laterites and lateritic soils in South-western Australia. J. Soil Sci., 11, 206–225.
Murray, H.H. & Lyons, S.C. (1956) Degree of crystal perfection of kaolinite. Clays Clay Miner., 4, 31–40.
Range, K.J., Range, A. & Weiss, A. (1969) Fire-clay type kaolinite or fire-clay mineral? Experimental classification of kaolinite-halloysite minerals. Proc. Int. Clay Conf. Tokyo,, 1, 3–13.
Ross, G.J., Kodama, H., Wang, C., Gray, J.T. & Lafreniere, L.B. (1983) Halloysite from strongly weathered soil at Mont Jacques Cartier, Quebec. Soil Sci. Soc. Am. J., 47, 327–332.
Sadleir, S.B. & Gilkes, R.J. (1976) Development of bauxite in relation to parent material near Jarrahdale, Western Australia. J. GeoL Soc. Aust., 23, 333–344.
Souza Santos, P. de, Souza Santos, H. de & Brindley, G.W. (1965) Mineralogical studies of kaolinite- halloysite soils in South-western Brazil. J. Soil. Sci., 11, 206–225.
Sudo, T. & Takahashi, H. (1956) Shapes of halloysite particles in Japanese clays. Clays Clay Miner , 4, 6779.
Tan, K.H. & Hajek, B.F. (1977) Thermal analysis. Pp. 865884 in: Minerals in Soil Environments (Dixon, J. B. & Weed, S. B., editors). Soil Sci. Soc. Am. Madison, Wisconsin.
Theng, B.K.G., Churchman, G.J., Whitton, J.S. & Claridge, G.G.C. (1984) Comparison of intercalation methods for differentiating halloysite from kaolinite. Clays Clay Miner, 32, 249–258.
Wada, K. (1961) Lattice expansion of kaolin minerals by treatment with potassium acetate. Am. Miner., 46, 7891.
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Clay Minerals
  • ISSN: 0009-8558
  • EISSN: 1471-8030
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