Banded iron ore hi-res stock photography and images - Alamy
File:Taconite (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; roadcut in Chisholm, Minnesota, USA) 41 (23606288242).jpg - Wikimedia Commons
A: Commonly observed banded iron formation (BIF) alteration stages
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Mineralogy and Geology of the Taconites and Iron Ores of the Mesabi Range, Minnesota
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Hematite (iron ore) (weathered zone in the Biwabik Iron-Fo…
Taconite - Wikipedia
File:Taconite (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; roadcut in Chisholm, Minnesota, USA) 26 (23632411431).jpg - Wikimedia Commons