Heptagonal duoexpandoprism

The heptagonal duoexpandoprism is a convex isogonal polychoron and the fifth member of the duoexpandoprisms that consists of 28 heptagonal prisms of two kinds, 49 cuboids, 98 wedges and 49 tetragonal disphenoids obtained as the convex hull of two orthogonal 7-14 duoprisms. However, it cannot be made uniform.