A gray-white, hard, brittle metallic element. Symbol, Mn. Manganese does
not occur uncombined in nature, but its minerals are widely distributed.
Pyrolusite (MnO2 ) and rhodochrosite (MnCO3 ) are the most
common minerals. The discovery of large quantities of manganese nodules on
the ocean floor, containing about 24% manganese, holds promise as a source
of manganese. Used to form many important alloys, esp. with steel,
aluminum, and antimony; used in dry cells and glass, and in the
preparation of oxygen, chlorine, and medicines.
Handbook of Chemistry and Physics, 3
Dictionary of Mining, Mineral, and Related Terms