Teaching models
molecular model of CsCl
molecular model of NaCl molecular model of CaF2

Caesium Chloride

Sodium Chloride
molecular model of CaCO3
molecular model of ice

Calcium Carbonate

Ice
molecular model of diamond molecular model of graphite
molecular model of C60

Calcium Fluoride

Diamond                                      Graphite                                        Fullerines

Carbon Allotropes
molecular model of Ia3d

Three views  of a Illustration of symmetry in Crystal system Ia3d
molecular model of seven crystal systems

The Seven Crystal Systems