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3D3DNative graphite.
I'd really love a piece of native graphite from the Borrowdale mine in England, where graphite was first discovered (creating the modern pencil industry), but failing that, this will have to do. It's native graphite from New Jersey.
Source: Franklin Mineral Museum
Contributor: Theodore Gray
Acquired: 6 August, 2004
Price: $6
Size: 2"
Purity: >95%
Carbon