The bond structure of this material provides {HEAD ~ physical properties} approaching those of diamond, including {TAIL ~ a hardness} of over about 50 GPa, with certain species having hardness of up to about 80 GPa 
The bond structure of this material provides { HEAD ~ physical properties } approaching those of diamond , including { TAIL ~ a hardness } of over about 50 GPa , with certain species having hardness of up to about 80 GPa
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH