Great rhombihexahedron

Great rhombihexahedron

Type	Uniform star polyhedron
Elements	F = 18, E = 48 V = 24 (χ = −6)
Faces by sides	12{4}+6{8/3}
Coxeter diagram	(with extra double-covered triangles) (with extra double-covered squares)
Wythoff symbol	2 4/3 (3/2 4/2) \|
Symmetry group	O_h, [4,3], *432
Index references	U₂₁, C₈₂, W₁₀₃
Dual polyhedron	Great rhombihexacron
Vertex figure	4.8/3.4/3.8/5
Bowers acronym	Groh

In geometry, the great rhombihexahedron (or great rhombicube) is a nonconvex uniform polyhedron, indexed as U₂₁. It has 18 faces (12 squares and 6 octagrams), 48 edges, and 24 vertices.^[1] Its dual is the great rhombihexacron.^[2] Its vertex figure is a crossed quadrilateral.

Orthogonal projections

Traditional filling	Modulo-2 filling

It shares the vertex arrangement with the convex truncated cube. It additionally shares its edge arrangement with the nonconvex great rhombicuboctahedron (having 12 square faces in common), and with the great cubicuboctahedron (having the octagrammic faces in common).

Truncated cube	Nonconvex great rhombicuboctahedron	Great cubicuboctahedron	Great rhombihexahedron

It may be constructed as the exclusive or (blend) of three octagrammic prisms. Similarly, the small rhombihexahedron may be constructed as the exclusive or of three octagonal prisms.

The great rhombihexacron is a nonconvex isohedral polyhedron. It is the dual of the uniform great rhombihexahedron (U₂₁).^[3] It has 24 identical bow-tie-shaped faces, 18 vertices, and 48 edges.

It has 12 outer vertices which have the same vertex arrangement as the cuboctahedron, and 6 inner vertices with the vertex arrangement of an octahedron.

As a surface geometry, it can be seen as visually similar to a Catalan solid, the disdyakis dodecahedron, with much taller rhombus-based pyramids joined to each face of a rhombic dodecahedron.