Symmetry of pyritohedral class

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“The symmetry of the Pyritohedral class is as follows: The three crystal axes of binary symmetry; the four diagonal axes, each of which emerges in the middle of the octant, are axes of trigonal symmetry.” — Ford, 1912




William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 24


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