Between 0 and ~10 THz, the first three bands correspond to lattice rigid translations 2 inplane and one out-of-plane; they are labeled as acoustic modes. At higher energy and up to the highest , remaining bands are the optic modes. 'glitter' (Fig. ) and 'isoglitter' (Fig. ) are characterized with the feature of high frequency (energy) bands around  = 50 THz corresponding to the C2-C2 short connections, whereas 'metaglitter' (Fig. ) has a band structure with  = 40 THz alike diamond as obtained by Raman spectroscopy .