Crystal structure: Rhombohedral

The rhombohedral unit cell (RHO) is a cube distorted in the direction of the space diagonal. Although it is primitive, it is not conventional, as the threefold axis does not lie in the direction of a lattice vector, but in the direction of the space diagonal.

5B
Boronblack-brown
33As
Arsenicmetallic grey
51Sb
Antimonysilvery lustrous gray
62Sm
Samariumsilvery white
80Hg
Mercuryshiny, silvery liquid
83Bi
Bismuthlustrous brownish silver