An alloy of iron and manganese used in the production of steel.
- During World War I he founded the Southern Manganese Corporation, using electric furnaces to produce ferromanganese for Birmingham's steel industry.
- The most common alloy of manganese is ferromanganese, which contains about 48% manganese, combined with iron and carbon.
- Closely related in origin to manganese nodules are the ferromanganese incrustations found on exposed rocks of the mid-ocean ridge, seamounts, and other places in the ocean where bare rock is exposed.
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