Thermite steel slag.
The thermite reaction produces a lot of slag, maybe 3 times as much slag by volume as metal. Fortunately the slag is lighter than the metal, so the metal falls out the bottom of the crucible first (after melting through the aluminum plug). I've been getting these interesting shells of slag mixed with un-reacted magnetite sand and some beads of iron from the reaction, forming on the inside surface of my graphite reaction crucible. They are fragile, but strong enough to come out intact sometimes. This isn't really an element sample, it's just an interesting by-product.
Source: Theodore Gray
Contributor: Theodore Gray
Acquired: 27 July, 2003
Price: Donated
Size: 4"
Purity: 50%
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