Vanadate mineral

Vanadate minerals are mineral species which contain both vanadium and oxygen. They usually also contain other cations, and may also contain other anions: however the mineral forms of the vanadium oxides navajoite (V₂O₅·3H₂O), vanoxite (V₆O₁₃·8H₂O) and lenoblite (V₂O₄·2H₂O) are also classed as vanadate minerals.

Vanadium(V) is rather too large for tetrahedral coordination but rather small for octahedral coordination, and vanadate minerals show a wide range of structural types, often of considerable complexity.

Vanadate minerals are unique among anion types in being divided between two primary classes in the Strunz classification. Minerals containing four-coordinate vanadium(V) are grouped with phosphate and arsenate minerals in class 08, while minerals containing five- and six-coordinate vanadium, which includes all minerals with vanadium(IV) or mixed oxidation states, are grouped as oxide minerals in class 04.