Autunite.  
I bought some Fiestaware plates from Jim to use in museum displays I'm helping coordinate, and he threw in this little sample of Autunite, a uranium mineral.  He probably has Fiestaware available if you need some. 
Source: Jim Markitell 
Contributor: Jim Markitell 
Acquired: 30 May, 2003 
Price: Donated 
Size: 1.5" 
Composition: Ca(UO2)2(PO4)2.10H2O
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