Uranium Autunite
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This autunite was donated by the mine owner who dug it up: It's a lovely specimen, photographed here under ultraviolet light. You can get samples of this an other radioactive minerals direct from the mine.
Source: eBay seller boomologist
Contributor: Theodore Gray
Acquired: 25 June, 2005
Price: Donated
Size: 1.5"
Composition: Ca(UO2)2(PO4)2.10H2O