psychoactivelectricity: Negaunee Iron Formation at Jasper Knob, near Ishpeming, Michigan by Allison Pluda. Banded iron formation of more than 2 billion years. The bands are alternating layers of gray magnetite and red iron.

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psychoactivelectricity: Negaunee Iron Formation at Jasper Knob, near Ishpeming, Michigan by Allison Pluda. Banded iron formation of more than 2 billion years. The bands are alternating layers of gray magnetite and red iron.

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