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3D3DHeavy lump of master alloy.
I think this is a lump (about 11 pounds) of manganese-steel master alloy. Etching with HCl (see next sample) produced an interesting dendritic structure, indicating that the material is not homogeneous. The source described it as pure manganese, but this is not likely.
Source: eBay seller grandejunquetion
Contributor: Theodore Gray
Acquired: 9 February, 2009
Text Updated: 8 February, 2009
Price: $10
Size: 6"
Purity: <70%