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|Noun||1.||hausmannite - a mineral consisting of manganese tetroxide; a source of manganese|
atomic number 25, manganese, Mn - a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
manganese tetroxide - an oxide of manganese found naturally as hausmannite