taconite (biwabik iron-formation, paleoproterozoic, ~1.878 ga; roadcut in chisholm, minnesota, usa) 8 color palette

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#756C48 #414722 #A07848 #AE9553 #A9AB69

related tags: 3B3E2B 756C48 8A765E 978B6A 999A7A A07848 A9AB69 AE9553 biwabik chisholm formation grade iron low mesabi minnesota ore paleoproterozoic precambrian proterozoic range taconite 414722 696553