MnO(OH)

This sample of manganite is displayed in the Smithsonian Museum of Natural History. Manganite is a oxide mineral of manganese with the composition MnO(OH). The sample at left is about 25 cm across and is from Ilfeld, Harz Mountains, Germany.

This is another sample of manganite from Ilfeld, Harz Mountains, Germany. It is about 15 cm across.