Vanoxite, Carnotite
Small Cabinet, 7.5 x 5.7 x 4.2 cm
Uravan District, Montrose Co., Colorado, USA
Vanoxite is a vanadium oxide with water that is, I think, the vanadium equivalent of rust or of rust-like mineral species we see commonly with iron and manganese. However, it seems fairly uncommon. Apparently because it does not crystallize, its IMA status is listed as Questionable/Doubtful as a species although that is a supposition. In any case, the material is present here as dark material in the matrix of carnotite (for which this is an excellent reference specimen). Ex. John White Collection.