bog iron


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bog iron

n.
A soft, porous deposit of impure hydrous oxides, such as goethite, formed in bogs, marshes, shallow lakes, and swamps through precipitation from iron-rich water and the oxidizing action of algae, bacteria, or the atmosphere.
Translations
järvimalmi
References in periodicals archive ?
24) didn't at least mention bog iron, which was the major source of iron ore during the Iron Age, at least in the Northern Hemisphere.
Just as important, the location offered access to raw materials like bog iron ore, which workers collected from the bottom of bogs, swamps, ponds, and riverbeds, yielding a mixture of materials that contained 30-50 percent usable iron.
The Vikings gathered bog iron ore from the peat bog, which they smelted to make iron nails for their boats.