Small birhombidodecateron

The small birhombidodecateron, or sibrid, also called the small birhombated hexateron or bicantellated 5-simplex, is a convex uniform polyteron. It consists of 20 triangular duoprisms and 12 small rhombated pentachora. 2 triangular duoprisms and 4 small rhombated pentachora join at each vertex. As the name suggests, it is the bicantellation of the hexateron.

Vertex coordinates
The vertices of a small birhombated dodecateron of edge length 1 can be given in 6 dimensions as all permutations of:
 * ($\sqrt{2}$, $\sqrt{2}$, $\sqrt{3}$/2, $\sqrt{5}$/2, 0, 0)

Representations
A small birhombated dodecateron has the following Coxeter diagrams:


 * o3x3o3x3o (full symmetry)
 * xoo3oxx3xxo3oox&#xt (A4 axial, small rhombated pentachoron-first)