  Etched block. 
This is an interestingly etched block of high-purity aluminum, showing the crystal zones.  It is a full bar of the material featured a few samples back in the form of a short slice. 
Source: Ethan Currens 
Contributor: Ethan Currens 
Acquired: 8 February, 2009 
Text Updated: 8 February, 2009 
Price: Trade 
Size: 8" 
Purity: 99.99%
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