Manganite is a mineral composed primarily of manganese oxide, with the chemical formula MnO(OH). It typically appears as black or dark brown crystals and has a metallic luster. Manganite is often found in metamorphic rocks and can form through the weathering of manganese-rich minerals. This mineral is an important source of manganese, which is used in steel production and various alloys. Manganite can also be found in locations such as Germany, Brazil, and the United States, where it is mined for its industrial applications.