Octagonal-small rhombicuboctahedral duoprism

The octagonal-small rhombicuboctahedral duoprism or osirco is a convex uniform duoprism that consists of 8 small rhombicuboctahedral prisms, 18 square-octagonal duoprisms of two kinds and 8 triangular-octagonal duoprisms.

The octagonal-small rhombicuboctahedral duoprism can be vertex-inscribed into a small prismated penteract.

This polychoron can be tetrahedrally alternated into a square-truncated tetrahedral duocupoliprism, although it cannot be made scaliform. It can also be tetrahedrally bialternated to create a bialternatocupolaic truncated tetrahedral-square duoprism, which is also nonscaliform.

Vertex coordinates
The vertices of an octagonal-small rhombicuboctahedral duoprism of edge length 1 are given by all permutations and sign changes of the last three coordinates of:
 * (±1/2, ±(1+$\sqrt{2}$)/2, ±1/2, ±1/2, ±(1+$\sqrt{2}$)/2),
 * (±(1+$\sqrt{2}$)/2, ±1/2, ±1/2, ±1/2, ±(1+$\sqrt{2}$)/2).