Abstract
The visualization and representation of optic orientation is the nittygritty of practical optical mineralogy. A complete description is concisely made with the use of a stereographic projection. Perspective drawings can also give complete information and are often easy to understand. Drawings of principal sections, particularly the pinacoids, are also helpful and can be easy to construct. The identification of pinacoidal and other sections requires observation of the interference figure. We will illustrate several examples of optic orientation completely, with stereo nets, perspective drawings, sections, and interference figures. We begin with a brief review of morphological crystallography in stereograms of the holosymmetric classes of the five crystal systems that are optically anisotropic. The optical symmetry of a crystal must always be consistent with the holosymmetric class of the crystal system to which it belongs.
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© 1994 Springer Science+Business Media Dordrecht
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Stoiber, R.E., Morse, S.A. (1994). Optic Orientation in Stereo. In: Crystal Identification with the Polarizing Microscope. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2387-1_14
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DOI: https://doi.org/10.1007/978-1-4615-2387-1_14
Publisher Name: Springer, Boston, MA
Print ISBN: 978-0-412-04831-9
Online ISBN: 978-1-4615-2387-1
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