Symmetry of Sphenoidal class
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“The Sphenoidal Class corresponds in the Tetragonal system to the Tetrahedral class in the Isometric System. It is characterized by the following symmetry: The three crystallographic axes are axes of binary symmetry, and there are two vertical diagonal planes of symmetry.” — Ford, 1912
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William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 35
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