Solid State: Playground and Miller indices


Bonds








1x1x1 unitcell


Polyhedra (number of vertices)






i:  j:  k:



snapshot

Examples:
h:  k:  (-(h+k): ) ℓ:
Orientation
Several crystal structures of organic, inorganic, metal-organic compounds and minerals, excluding biopolymers can be downloaded on COD, an open-access site

More information about Miller indices on Wikipedia