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Thaddeus Kosciuszko National Memorial Photo of exhibit
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Thaddeus Kosciuszko National Memorial
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Iron ore of the type that was used by Hopewell Furnace.

Did You Know?
"Slag" was the waste material created during Hopewell Furnace's iron smelting process. It consisted of residual minerals in the iron ore that remained after the iron had been removed. Often it appears glassy and multicolored, a combination of minerals such as copper, nickle and manganese.
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Last Updated: September 15, 2009 at 14:29 MST