  Raw tungsten carbide pellet. 
This is a pellet of sintered tungsten carbide (with cobalt as the binder).  I made it myself using a graphite mold (listed under carbon) and an acetylene torch.  Check out the neighboring sample to see what I did with it. 
You can read more in my Popular Science column on the topic. 
Source: Theodore Gray 
Contributor: Theodore Gray 
Acquired: 1 December, 2008 
Text Updated: 2 December, 2008 
Price: $1 
Size: 0.5" 
Purity: >60%
 |  
  |  
 |  
  |