Abstract
THE proverbial importance of the number seven is once more illustrated in regard to the systems of symmetry exhibited by solid matter in its most perfectly organised form, the crystalline. For there are seven such systems or styles of architecture of crystals, just as there are seven distinct notes in the musical octave, and seven chemical elements in the octave or period of Newlands and Mendelé, the eighth or octaval note or element being but a repetition on a higher scale of the first.
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The Seven Styles of Crystal Architecture . Nature 81, 299–300 (1909). https://doi.org/10.1038/081299b0
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DOI: https://doi.org/10.1038/081299b0