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...eacute;lan crystals, they generally take the shape of [[pyramid]]-capped [[prism]]s, with their [[cross section]]s bearing anywhere from three to nine [[edg ...runs parallel to the crystal's axis—that is, along the length of the prism, from one pyramidal cap to the other—and most (though not all) crysta

...r shapes. A [[regular hexagon]] could be a cross-section of a hexagonal [[prism]], a six-sided pyramid, a cube, a [[cuboctahedron]], a [[triakis tetrahedro