  Laptop frame part. 
This is a magnesium alloy casting, part of an IBM ThinkPad frame.  It's surprisingly light, which is of course why they use magnesium.  Combine a flammable magnesium frame with a lithium ion battery that catches fire and you could have some fun! 
Source: Max Cane 
Contributor: Max Cane 
Acquired: 23 December, 2007 
Text Updated: 24 December, 2007 
Price: Donated 
Size: 8" 
Purity: >95%
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