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Torbernite
An example of the element Uranium

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Uranium Torbernite
Torbernite.
Torbernite is a lovely, lovely green color (I would guess from the copper). It's also quite radioactive, from the uranium content, and even more so from the mixture of uranium decay products that have built up in it over millions of years.
Source: eBay seller migalf1
Contributor: Theodore Gray
Acquired: 3 June, 2005
Price: $27
Size: 1.5"
Composition: Cu(UO2)2(PO4)2.8-12H2O
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