Towson University
Towson University: Shapes of Molecules
This chemistry class printout details the main points of molecular geometry and explains bond hybridization and bond angles.
James Madison University
James Madison University: Mineral Hardness and Cleavage
An explanation of the Mohs Hardness scale is followed by illustrations of crystal structures and cleavage.
Other
Showroom: All Uniform Polyhedra
This site has pictures and information on many different types of polyhedra.