Pictures obtained from Dr Haynes, University of Sheffield, course notes for CHM111.
Carbon has many different structures or allotropes.
The crystal structures of carbon are diamond, graphite and fullerene, which was only discovered recently. Other forms of carbon have amorphous structures such as coke. The structure of diamond is quite complex. It has a covalent network of atoms all linked together. This structure is formed due to the sp 3 hybridization.