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 ?
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.