taconite (biwabik iron-formation, paleoproterozoic, ~1.878 ga; roadcut in chisholm, minnesota, usa) 7 color palette

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#72694E #383820 #A09864 #B1A587 #899251

related tags: 72694E 7D8261 918D73 A09864 A6A091 B1A587 biwabik chisholm formation grade iron low mesabi minnesota ore paleoproterozoic precambrian proterozoic range taconite 323226 383820 696557 899251