Great rhombihexahedron

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.

Great rhombihexahedron
TypeUniform star polyhedron
ElementsF = 18, E = 48
V = 24 (χ = 6)
Faces by sides12{4}+6{8/3}
Wythoff symbol
Symmetry groupOh, [4,3], *432
Index referencesU21, C82, W103
Dual polyhedronGreat rhombihexacron
Vertex figure
4.8/3.4/3.8/5
Bowers acronymGroh
3D model of a great rhombihexahedron

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.

Great rhombihexacron

Great rhombihexacron
TypeStar polyhedron
Face
ElementsF = 24, E = 48
V = 18 (χ = 6)
Symmetry groupOh, [4,3], *432
Index referencesDU21
dual polyhedronGreat rhombihexahedron
3D model of a great rhombihexacron

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.

See also

References


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