Heptagonal duotegmatic alterprism

The heptagonal duotegmatic alterprism is a convex isogonal polyteron that consists of 2 heptagonal duotegums and 98 isosceles triangular-triangular duotegums. 2 heptagonal duotegums and 21 triangular-triangular duotegums join at each vertex. It can be formed as an alterprism of a heptagonal duotegum, or as the hull of two dually oriented heptagonal disphenoids.