  Briquette. 
Looking rather like a small charcoal briquette, this object is made of relatively pure chromium, and is used in analytical metallurgy.  For what I am not privy. 
Source: Ethan Currens 
Contributor: Ethan Currens 
Acquired: 30 October, 2006 
Text Updated: 19 November, 2007 
Price: Donated 
Size: 1.5" 
Purity: 99.8%
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