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