A crystal or geometric solid that has two kinds of faces or surfaces arranged symmetrically.
From Greek 'diplos' (double) + 'hedron' (face). This crystallographic term emerged in mineral classification to precisely describe crystal structures with dual-face symmetry.
Some gemstones naturally grow into these special two-faced crystal shapes—mineralogists gave them this tongue-twisting name because the crystal's symmetry is so mathematically exact and predictable.
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