It was first described in 1817 for an occurrence in the Harz Mountains , Saxony - Anhalt , Germany .
Manganosite is a rare mineral composed of manganese ( II ) oxide MnO .
Manganosite was first described in 1817 for an occurrence in the Harz Mountains , Saxony - Anhalt , Germany .
Manganosite is a rare mineral composed of manganese ( II ) oxide MnO .