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manganese nodule

noun

  1. geology a small irregular concretion found on deep ocean floors having high concentrations of certain metals, esp manganese
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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manganese bronzemanganese spar

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