  Dentopharma aluminum compound. 
This is apparently some kind of material used to fill teeth, though I don't entirely understand how it's supposed to harden.  Look at the rotation video to see the instructions on the back. 
Source: eBay seller alpinevarietystore 
Contributor: Theodore Gray 
Acquired: 16 October, 2009 
Text Updated: 18 October, 2009 
Price: $4 
Size: 0.5" 
Purity: <50%
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