Octahedra = 8 sided, Tetra deca hedra = 4 10 sided. An octahedron in emulsion parlance in the case above is a cube with clipped corners. A cube has 6 faces and 8 corners. If you look closely at my photomicrograph, you see that each side has 6 edges but there are 8 + 6 sides making 14. Go figure!

There are several possible shapes possible. AFAIK, there is nothing "golden" or special about them.

PE