Bundet jernformasjon

En bundet jernformasjon er et sediment avsatt på bunnen av oksygenfattig sjø for mange millioner år siden, trolig via cyanobakterier. Det består av lagdelt stein som inneholder konsentrerte bånd av jernoksider i ulike kjemiske forbindelser. Jernformasjoner benyttes til utvinning av jernmalm.

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