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3DConcave Lump.
This lump has some interesting patterns of its oxide on the surface. It looks like it was formed by melting in a cup-shaped crucible.
Source: George (not 007) Lazenby
Contributor: George (not 007) Lazenby
Acquired: 20 November, 2002
Price: Donated
Size: 0.75"
Purity: 99.99%