Heptagonal duotruncatoalterprism

The heptagonal duotruncatoalterprism is a convex isogonal polychoron and the sixth member of the duotruncatoalterprism family. It consists of 14 heptagonal prisms, 28 heptagonal cupolas, 49 rectangular trapezoprisms, and 49 tetragonal disphenoids. 1 heptagonal prism, 3 heptagonal cupolas, 2 rectangular trapezoprisms, and 1 tetragonal disphenoid join at each vertex. It can be obtained as the convex hull of two orthogonal heptagonal-diheptagonal duoprisms. However, it cannot be made scaliform.