Pyramid of the second order
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“This is a form composed of twelve isoceles triangular faces, each of which intersects two of the horizontal axes equally, the third and immediate horizontal axis at one-half this distance, and also intersects the vertical axis.” — Ford, 1912
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PyramidsSource
William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 39
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