Rhombohedron  

Type  Prism 
Faces  6 rhombi 
Edges  12 
Vertices  8 
Symmetry group  C_{i} 
Properties  convex, zonohedron 
In geometry, a rhombohedron is a threedimensional figure like a cube, except that its faces are not squares but rhombi. It is a special case of a parallelepiped where all edges are the same length.
In general the rhombohedron can have three types of rhombus faces in congruent opposite pairs.
If all of the nonobtuse internal angles of the faces are equal (all faces are same), it can be called a trigonal trapezohedron.
Another special case is that, where there is a plane of symmetry through four vertices (with symmetry group C_{2h}), and a special case of that, where there is another plane of symmetry through the other four vertices (with symmetry group D_{2h}).
The cube combines these special properties, and so is a special case of the rhombohedron.







