File:Iron oxide brown.jpg - Wikimedia Commons

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File:Leptothrix discophora Film and Iron Oxide Floc along the

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File:Iron oxide-travertine microgours (Ohio Caverns, western Ohio

File:Iron-oxide stained limestone cave wall (Ohio Caverns, western

File:Calthemite flowstone with Iron Oxide deposited along with

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File:IronOxidePigmentUSGOV.jpg - Wikimedia Commons

File:Iron oxide solution.JPG - Wikimedia Commons

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File:Traces of iron oxide give reddish hue to this rock formation

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File:Iron oxide-stained joint surface (Cowbell Member, Borden

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File:Iron-oxide stained limestone cave wall (Ohio Caverns, western