Experimental transformation of kaolinite to halloysite
Singh, Balbir & Mackinnon, Ian D.R. (1996) Experimental transformation of kaolinite to halloysite. Clays and Clay Minerals, 44(6), pp. 825-834.
A well-characterized kaolinite has been hydrated in order to test the hypothesis that platey kaolinite will roll upon hydration. Kaolinite hydrates are prepared by repeated intercalation of kaolinite with potassium acetate and subsequent washing with water. On hydration, kaolinite plates roll along the major crystallographic directions to form tubes identical to proper tubular halloysite. Most tubes are elongated along the b crystallographic axis, while some are elongated along the a axis. Overall, the tubes exhibit a range of crystallinity. Well-ordered examples show a 2-layer structure, while poorly ordered tubes show little or no 3-dimensional order. Cross-sectional views of the formed tubes show both smoothly curved layers and planar faces. These characteristics of the experimentally formed tubes are shared by natural halloysites. Therefore, it is proposed that planar kaolinite can transform to tubular halloysite.
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|Item Type:||Journal Article|
|Additional Information:||GeoRef, Copyright 2009, American Geological Institute. 1997-038561|
|Keywords:||bonding, chemical properties, clay mineralogy, crystal chemistry, crystal growth, crystallography, electrons, experimental studies, geochemistry, halloysite, hydration, kaolinite, polyhedra, sheet silicates, TEM data, transformations, X-ray diffraction data|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)|
|Divisions:||Current > Institutes > Institute for Future Environments|
|Copyright Owner:||Copyright 1996 Clay Minerals Society|
|Copyright Statement:||Reproduced with kind permission of The Clay Minerals Society, publisher of Clays and Clay Minerals|
|Deposited On:||30 Jan 2013 22:34|
|Last Modified:||12 Nov 2013 04:17|
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