Originally Posted by Photo Engineer
An octahedron is a cube with clipped corners,
but only if they are clipped in such a way so as to compleatly eliminate the  faces of the cube.
Shallow clipping that only reduces the area of cube faces but does not elimnate them, produces tetradecahedral grains
(the 6 cube faces + the 8 slightly truncated corners)
"Golden Tetras" was something that sprung up in my mind from once having had an interest in Tropical Fish.
My dendrites were streching!