  Zinc medallion.
For a Popular Science column I wrote about making glass I needed a graphite mold to press the glass into. I machined one out of a block of graphite, and tested it by casting this medallion out of cheap and easy to melt zinc. Satisfied with the shape I went on to make similar medallions out of glass (listed under silicon because glass is mostly silica).
Source: Theodore Gray
Contributor: Theodore Gray
Acquired: 26 October, 2008
Text Updated: 29 January, 2009
Price: $1
Size: 2.5"
Purity: 99.9%
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