Iridium oxide, IrO₂, is the only well characterised oxide of iridium. Its crystal has the TiO₂, rutile

Titanium dioxide

Titanium dioxide, also known as titanium oxide or titania, is the naturally occurring oxide of titanium, chemical formula . When used as a pigment, it is called titanium white, Pigment White 6, or CI 77891. Generally it comes in two different forms, rutile and anatase. It has a wide range of...

structure containing six coordinate iridium and three coordinate oxygen.

It is used with other rare oxides in the coating of anode-electrodes for industrial electrolysis.

It can be formed by oxidation of iridium black, a finely divided powder of iridium metal.