Trapezo-Rhombic Dodecahedron
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If the spheres of face-centered cubic packing are expanded until they fill up the gaps, they form a solid rhombic dodecahedron, and if the spheres of hexagonal close packing are expanded, they form the trapezo-rhombic dodecahedron (Steinhaus 1999, p. 206). http://mathworld.wolfram.com/Trapezo-RhombicDodecahedron.html
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