Uranium Zippeite
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3D3DZippeite.
I think most of this rock is actual zippeite, but I don't know for sure.
Source: eBay seller dr**zarkoff
Contributor: Theodore Gray
Acquired: 3 June, 2005
Price: $20
Size: 1.5"
Composition: K4(UO2)6(SO4)3(OH)10.4H2O
Uranium