A pyritohedron is an irregular dodecahedron composed of identical irregular pentagons. The name "pyritohedron" derives from that fact that a common crystal form in pyrite has this shape.
Pyritohedron
See also
Dodecahedron, Rhombic Dodecahedron, Trigonal DodecahedronExplore with Wolfram|Alpha
References
Cotton, F. A. Chemical Applications of Group Theory, 3rd ed. New York: Wiley, p. 63, 1990.Referenced on Wolfram|Alpha
PyritohedronCite this as:
Weisstein, Eric W. "Pyritohedron." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Pyritohedron.html