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manganese nodule (plural manganese nodules)

  1. (geology) a concretion of oxides of manganese and iron found on the floor of many oceans
    • 1977 The most likely locations for early commercial mining of these seabed resources will be the Pacific Basin where there is a heavy concentration of manganese nodule sites at depths of between 12,500 feet and 17,500 feet. The Times - May 26, 1977 pg 27 col D