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I think it's the yellow crystals on this rock that are the actual Boltwoodite: I have no idea what the rest is.
Source: SoCal (Nevada), Inc
Contributor: Theodore Gray
Acquired: 3 June, 2005
Price: $28
Size: 1.5"
Composition: (K+Na)[(UO2)(SiO3OH)](H2O)1.5