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.

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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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ID Code: 55706
Item Type: Journal Article
Refereed: Yes
Additional Information: GeoRef, Copyright 2009, American Geological Institute. 1997-038561
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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
DOI: 10.1346/CCMN.1996.0440614
ISSN: 1552-8367
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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