Thermite steel, larger. 
After I got my technique down, I started practicing thermite casting with a standard batch of about a pound of powder.  These pieces are examples of the output of those reactions, cast into different kinds of graphite molds.  Here's a picture of the mold that makes the cylinders: 
  
 
Here's what it looks like just after opening it: 
  
 
See below for what I was practicing for: An iron link in my multi-metal chain. 
 
Source: Theodore Gray 
Contributor: Theodore Gray 
Acquired: 27 July, 2003 
Price: Donated 
Size: 3" 
Purity: >90%
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