The red component of this compound is one of an infinite number of possible pyritohedral dodecahedra. It’s shown by itself in the image below.
I made this compound using Stella 4d, a program you can try for free at http://www.software3d.com/Stella.php.
I really like the second large polyhedron model (all in red). It would make an unusual 12 faced fair die.
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