  Lump. 
Strange, partially melted zirconium lump.  Perhaps sintered from a powder then mechanically worked?  I'm not sure why someone would do that to zirconium, and I have not seen it in this form before.  This sample came from an old collection assembled by Ron Hipschman, an old hand at the Exploratorium in San Francisco (my favorite science museum). 
Source: Ethan Currens 
Contributor: Ethan Currens 
Acquired: 23 December, 2005 
Text Updated: 19 November, 2007 
Price: Donated 
Size: 1" 
Purity: 99.9%
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