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Tungsten pentoxide (W2O5) was reported in early literature but proved to have thestoichiometry W18O49.[1] Sometimes called mineral blue, it is a blue solid formed by the reaction oftungsten trioxide (WO3) andtungsten metal at 700 °C.[1]
There are a number of these unusual intermediate oxides formed from reacting metal and trioxide, including W20O58 and W24O70.[1] W18O49 contains bothoctahedral andpentagonal bipyramidal co-ordination of the metalatoms byoxygen.[1]
