  Thick anodized plate. 
This lovely thick plate of niobium was anodized using a battery charger by Juan and friends in their car shop.  You can see many other examples of anodized niobium on my site, but this is by far the largest! 
Source: Juan Jimenez 
Contributor: Juan Jimenez 
Acquired: 6 April, 2007 
Text Updated: 6 April, 2007 
Price: Donated 
Size: 5" 
Purity: 99.95%
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