Abstract
IN a previous communication1 it was pointed out that the ditrigonal surface symmetry observed for a number of layer lattice silicates probably plays an important part in determining polymorphism among the micas. This idea has now been extended considerably by theoretical and experimental studies to be reported elsewhere. It appears to me that the ideal layer lattice structures must have ditrigonal, rather than hexagonal, surface symmetry. That is, the tetrahedral groups apparently can rotate quite readily about axes normal to the sheets to allow the tetrahedral sheets to contract to the dimensions of the octahedral sheets.
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References
Radoslovich, E. W., Nature, 183, 253 (1959).
Brindley, G. W., and MacEwan, D. M. C., Ceramics Symp., Brit. Cer. Soc., 15 (1953).
Radoslovich, E. W., Acta Cryst., 13, 919 (1960).
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RADOSLOVICH, E. Surface Symmetry and Cell Dimensions of Layer Lattice Silicates. Nature 191, 67–68 (1961). https://doi.org/10.1038/191067a0
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DOI: https://doi.org/10.1038/191067a0
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