  Button for no reason. 
Description supplied by the source: 
This is a nice little button of pure hafnium that was lying around the alloy company I was visiting, so I picked it up and sent it to you!  Nothing particularly special, but hey, it's hafnium. 
Source: Ethan Currens 
Contributor: Ethan Currens 
Acquired: 30 April, 2008 
Text Updated: 30 April, 2008 
Price: Anonymous 
Size: 1" 
Purity: 99.99%
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