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Large rock of Manganese.


Symbol Name Atomic Number Atomic Weight Group Number
Mn Manganese 25 54.93805 7


Standard State: solid at 298 K
Color: silvery metallic

Manganese was recognized by Scheele, Bergman and others as an element and isolated by Gahn in 1774 by reduction of the dioxide with carbon. Manganese minerals are widely distributed; oxides, silicates, and carbonates are the most common.  The discovery of large quantities of manganese nodules on the floor of the oceans holds promise as a source of manganese.  It resembles iron but is harder and very brittle.  In steel, manganese improves the rolling and forging qualities, strength, toughness, stiffness, wear resistance, hardness, and hardening ability.  It is an important trace element and may be essential for utilization of vitamin B1.