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When I was a kid we used to drag magnets around in the dirt and collect "iron filings". Are they pure iron, or something else?
More likely they were iron oxides. In moist soil ,iron/steel filings would not last more than a few weeks before turning to oxides. Now the "oxides" are not simply Fe O, Fe 2 O 3, Fe 3 O 4 , they are also hydrates, hydroxides ,etc.
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