Abstract
X-RAY studies of these minerals in relation to (a) their reactions with organic liquids (MacEwan), (b) the effect of heat treatment (G. W. B. and K. R.) have led us to certain conclusions which can best be expressed in a joint communication. Meta-halloysite has the same formula as kaolinite, Al2Si2O5(OH)4, and from the work of Hendricks and others1 is generally considered to have a closely similar structure, consisting of layers of Si-tetrahedra and Al-O,(OH) octahedra which in kaolinite2 are arranged regularly above each other, but which in meta-halloysite are stacked with “considerable disorder”1 or even, as we believe, with almost complete disorder as regards the orientation of the layers. In what follows we set out briefly the evidence for this view of the meta-halloysite structure.
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References
Hendricks, S. B., Amer. Min., 23, 295 (1938). Alexander, L. T., et al., Amer. Min., 28, 1 (1943).
Brindley, G. W., and Robinson, K., Nature, 156, 661 (1945).
Warren, B. E., Phys. Rev., 59, 693 (1941).
Maegdefrau, E., and Hofmann, U., Z. Krist., 98, 299 (1937). Hofmann, U., and Hausdorf, A., Z. Krist., 104, 265 (1942).
MacEwan, D. M. C., Nature, 157, 159 (1946).
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BRINDLEY, G., ROBINSON, K. & MACEWAN, D. The Clay Minerals Halloysite and Meta-Halloysite. Nature 157, 225–226 (1946). https://doi.org/10.1038/157225b0
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DOI: https://doi.org/10.1038/157225b0
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