Abstract
ABOUT 40 natural compounds, especially hydroxides, borates and carbonates, can be structurally described on the basis of triangular partitionings of the plane. Physically, these compounds are fibrous with a fibre translation of 3.0–3.2 Å, the octahedral edge distance. Although the structures are three-dimensional octahedral frameworks, non-equivalent atoms do not overlap or superimpose, and solution and classification of such structures are two-dimensional “wallpaper”-type problems.
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References
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Ramachandran, G. N., and Srinivasan, R., Fourier Methods in Crystallography, 96 (Wiley-Interscience, New York, 1970).
Moore, P. B., Amer. Mineral, 1005 (1969).
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MOORE, P., ARAKI, T. Wightmanite, Mg5(O)(OH)5[BO3]·nH2O, a Natural Drainpipe. Nature Physical Science 239, 25–26 (1972). https://doi.org/10.1038/physci239025a0
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DOI: https://doi.org/10.1038/physci239025a0
