Manganese(IV) oxide, also known as manganese dioxide, is a chemical compound with the formula MnO2. It consists of manganese in a +4 oxidation state and is commonly found in nature as a mineral. This compound appears as a black or dark brown solid and is used in various applications, including batteries, ceramics, and as a catalyst in chemical reactions. In addition to its industrial uses, manganese(IV) oxide plays a role in the production of glass and the purification of drinking water. It can also be used in the synthesis of other manganese compounds, making it an important material in both chemistry and manufacturing processes.