  Foundry ingot. 
This 35-pound ingot is one of a pair I bought from Hall Mark Metals (who also sell on eBay, see source link).  These ingots are intended to be melted down for casting or alloying.  35 pounds of bismuth is quite a lot, but I find uses for it in making crystals from time to time, or for trading. 
Source: eBay seller hallmarkmetals 
Contributor: Theodore Gray 
Acquired: 20 December, 2005 
Text Updated: 30 May, 2006 
Price: $10/pound 
Size: 14" 
Purity: 99.99%
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