  Fuel pellet. 
This is said to be a fuel pellet intended to be used in a "SLOWPOKE" style research reactor, which would mean it contains enriched uranium.  I'm unclear on the legality of owning enriched uranium: If it's illegal, I'm sure this doesn't contain any, OK?  I got this pellet by trading some custom-formed lead shielding blocks to a guy who was building a Farnsworth Fusor (a kind of tabletop fusion machine that actually works).  Ah, such hobbies we have. 
Source: Anonymous 
Contributor: Anonymous 
Acquired: 10 August, 2004 
Text Updated: 8 December, 2007 
Price: Donated 
Size: 0.5" 
Purity: 50%
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