Ditetragonal pyramid Small 165×320 Medium 330×640 Large 527×1024 Download Tiff Original 1236×2400 | (332.0 KB) Description "The ditetragonal pyramid is a form composed of sixteen isoceles trianglular faces, each of which intersects all three of the crystallographic axes, cutting the two horizontal axes at different lengths." — Ford, 1912 Keywords ditetragonal, geology, geometry, pyramid Galleries Bipyramids Source: William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 33 Courtesy the private collection of Roy Winkelman
