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. iron ores , by contrast, are among the most abundant in the earth's crust, although extracting usable metal from them requires kilns or furnaces capable of reaching °c or higher, about °c higher than what is enough to smelt copper . humans started to master that process in eurasia only about bce[ not
modern world , iron alloys, such as steel , inox , cast iron and special steels are by far the most common industrial metals, because of their high mechanical properties and low cost. pristine and smooth pure iron surfaces are mirror-like silvery-gray. however, iron reacts readily with oxygen and water...
https://en.wikipedia.org/wiki/Iron