  Mischmetal block.
A large block of "mischmetal", a mixture of lanthanum, cerium, and a few other random rare earths. Blocks like this are used for spark effects in movies. It is incredibly sparky stuff, here I'm holding it up to a small grinding wheel. The "Spin" and "Rotate" videos show this in action.
Source: eBay
Contributor: Theodore Gray
Acquired: 16 April, 2009
Text Updated: 16 April, 2009
Price: $30
Size: 3"
Purity: <20%
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