Symmetry of normal class

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“The symmetry of the Normal Class of the Hexagonal System is as follows: The vertical crystallographic axis is an axis of hexagonal symmetry. There are six horizontal axes of binary symmetry, three of them being coincident with the crystallographic axes and the other three lying midway between them.” — Ford, 1912




William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 38


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