dipyramid
nounDefinition of dipyramid
: a crystal consisting of two pyramids base to base, the one geometrically a mirror image of the other with respect to the horizontal plane of symmetry dipyramids occur in the tetragonal, hexagonal, and orthorhombic systems and may have corresponding orthorhombic, tetragonal, ditetragonal, hexagonal, or dihexagonal symmetry
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