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Electrowinning plate.
An example of the element Cobalt

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Electrowinning plate.
This is almost certainly a plate that came from the electrolytic extraction of cobalt from its ore, or from an electrolytic purification process. Cobalt was dissolved in a solution and electricity was used to plate it out onto an electrode. Very pretty, very heavy.
Source: eBay seller akilawolf
Contributor: Theodore Gray
Acquired: 5 June, 2003
Price: $15.50
Size: 1.2"
Purity: 99.9%
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