Molecular dynamics simulations under high pressure and temperature were performed in order to determine the stability of different phases of polymerized C 60 fullerites. Under extreme conditions, we found novel and stable interconnections different from [2+2] cycloadditions. We have also calculated the corresponding X-ray diffraction patterns, electronic densities of states and bulk moduli for metastable C 60 polymerized phases generated with these novel and stable interconnections. In particular, we found crystalline C 60 polymerized structures exhibiting XRD patterns extremely similar to those reported experimentally for the orthorhombic, tetragonal and rhombohedral C 60 polymerized phases.