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The yellow crust is the carnotite, an ore of uranium that also contains some traces of radium, which is used to justify the name "Radium Ore Revigator" used to describe the water jug you'll find listed under uranium (and which is lined with carnotite).
Source: eBay seller dr**zarkoff
Contributor: Theodore Gray
Acquired: 3 June, 2005
Price: $15
Size: 1.5"
Composition: K2(UO2)2(VO4)2.3H2O