  Borrowdale graphite.
The mine at Borrowdale was the first, and for a century the only, source of graphite, making it critical to the world's supply of pencils in the 1700s.
Source: Andrew Goodall
Contributor: Andrew Goodall
Acquired: 2 April, 2009
Text Updated: 3 April, 2009
Price: Donated
Size: 2"
Purity: >95%
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