Examples of
materials that are not molecular are not exactly rare: most
minerals and all
metals have a
microstructure that is not composed of
molecules. Metals have a structure that consists of stacked atoms, that share their electrons. Minerals consist of
ions (atoms or 'molecules' that have one or more
electrons too many or too few, which gives them
negative or
positive charge, respectively), that are connected with ionic bonds rather than molecular bonds.
ometeotl, if you're still around and want to add this w/u to yours, let me know!