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a.1.Consisting of two hexagonal parts united; thus, a dihexagonal pyramid is composed of two hexagonal pyramids placed base to base.
References in periodicals archive ?
Careful measurement places the three models in the dihexagonal pyramidal class of modern crystallography.
Calcite crystallizes in a trigonal-hexagonal cell and typically forms scalenohedral (rhombohedrons) crystals, aragonite has an orthorhombic cell with dipyramidal (needles) shaped crystals, and vaterite has a hexagonal cell with dihexagonal dipyramidal (discs) shaped crystals.
This belly band constitutes a dihexagonal prism, {4150}, the angles of which are exactly those reported above.