manganese nodule
Manganese nodules, also known as polymetallic nodules, are solidified products of seabed rocks, produced by the solidification of iron or manganese hydroxides in a core. Its core may be extremely small and may completely transform into manganese minerals due to crystallization. When manganese nodules are visible to the naked eye, they may be small microfossils (Radiolaria or Foraminifera organisms) shells, phosphorylated shark teeth, basalt remains, or fragments of early solidified material.
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