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3D3DMond balls.
These balls are produced by the Mond process. They look quite similar to my copper raspberry nodules, which took me a long time to figure out. For a while I thought the copper nodules were naturally occurring, but evidence has built up that they are artificial, and these nickel balls, which are known to be artificial, are another nail in the coffin of the natural origins theory for the similar copper ones.
Source: eBay seller akilawolf
Contributor: Theodore Gray
Acquired: 5 June, 2003
Price: $12
Size: 0.75"
Purity: 99.9%