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These complexes are analogous to the molybdo-vanadosilicates, and are prepared as yellowish-red to red crystals by the action of vanadates on the silico-tungstates, or by the action of hydrofluosilicic acid on the tungsto-vanadates. The following series has been recognised

3R2O.SiO2.V2O5.9WO3 xH2O;
(R = NH4 or K; R2 = Ba.)

Double salts have also been isolated.

Several of the natural ores of vanadium consist of complex silicates, e.g. ardennite and roscoelite.

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