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Vanoxite: V++++4V+++++2O13·8(H2O) (?) Corvusite: (Na,Ca,K)V8O20·4(H2O)
Comments: Blue-black, somewhat silky vanoxite, with brown corvusite on sandstone. Location: Club Mine, Uravan, Montrose County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species