14 - pyritohedron
But, this sort of dodecahedron is not regular, because the crystal
structure of iron pyrite is cubical. When cubes do their best to
act like a regular dodecahedron, it's called a pyritohedron:
This picture is from Steven Dutch's webpage on Building Isometric
Crystals with Unit Cells,
part of his website called Symmetry, Crystals and Polyhedra.