Oxometallates include permanganate (), chromate () and vanadate ( or ). Aqueous vanadate (V) compounds undergo various self-condensation reactions. The presence of the vandium substrate vanadate, is essential for the function of chloroperoxidase. The compound is prepared by reduction of ammonium vanadate in the presence of acetylacetone. More specifically bismuth vanadate is a mixed-metal oxide. The molybdovanadate reagent is a solution containing both the molybdate and vanadate ions. The structures of many vanadate compounds have been determined by X-ray crystallography. PO (phosphate), AsO (arsenate), and VO (vanadate). Other types of inhibitors include oxyanionic (oxygen binding) molybdate, tungstate and vanadate. Bismuth vanadate is the inorganic compound with the formula BiVO. In crystallographic studies, hydrolysis transition states are modeled by the bound vanadate ion. This new, more environmentally friendly coating is referred to as a vanadate conversion coating. Solutions of vanadate turn bright orange at pH 6.5, indicating the presence of decavanadate. For example, the vanadate cage VO can enclose a Cl ion. Francevillite is a uranyl-group vanadate mineral in the tyuyamunite series.