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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.
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.
Two possibilities unrelated to Triassic-Jurassic subaerial exposure are: oxidation of a pyritized surface by modern oxidizing ground waters; or the occurrence of a ferromanganese oxide crust.
Standard high-carbon ferromanganese , for example, has picked up around $20 to trade at $525 to $535 a tonne in-warehouse in the United States, up from the $510 low hit after several weeks of unabated decline.
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