Abstract
THE theory of the modification of crystal angles, just offered in dealing with quartz, is manifestly applicable to all crystals not of the cubic system, and it is submitted that for every such crystal there is an ideal or root form proper to one or other of the five kinds of internal symmetry which have been presented, from which root form the actual form can be derived by a proper proportionate increase of dimension in one or more directions.
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BARLOW, W. Probable Nature of the Internal Symmetry of Crystals 1 . Nature 29, 205–207 (1883). https://doi.org/10.1038/029205a0
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DOI: https://doi.org/10.1038/029205a0
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