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Aug2 17 Last Modified: 2017-08-02 11:12:33 https://serc.carleton.edu/download/files/16225/proper_rotation_axis_12.13.v3.mp4
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Symmetry Elements https://serc.carleton.edu/NAGTWorkshops/mineralogy/xtlsymmetry/elements.html
Provenance From Dyar, Gunter, and Tasa, 2008
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Proper rotation axis 12.13