Abstract
IN dealing with crystals of low symmetry, a model showing the orientation of the indicatrix axes with respect to the external form helps greatly in visualizing the optical characters which will be presented by sections parallel to different faces. I have found the model described below extremely useful for this purpose, both in the study of new material and as an aid to the appreciation of published optical data. It is readily constructed from simple materials and can be adjusted to represent the optic orientation in any biaxial crystal to a degree of approximation which depends mainly on the data available.
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HARTSHORNE, N. A Simple Universal Model for Representing the Optic Orientation of Biaxial Crystals. Nature 161, 94–95 (1948). https://doi.org/10.1038/161094a0
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DOI: https://doi.org/10.1038/161094a0
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