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More uranium glass marbles.
An example of the element Uranium

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More uranium glass marbles.
On any given day there are usually quite a few sets of marbles like this on offer on eBay. I waited until I got what seemed like a better-than-usual price for a bag of 25. They are mildly radioactive, and they fluoresce under black light.
Source: eBay seller danniken
Contributor: Theodore Gray
Acquired: 6 January, 2003
Price: $8
Size: 0.5"
Purity: <5%
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