Bog iron is a form of impure iron deposit that develops in bogs or swamps. The dominant source of iron ore in Scandinavia and Russia into the Middle

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Bog iron is a form of impure iron deposit that develops in bogs or swamps. The dominant source of iron ore in Scandinavia and Russia into the Middle Ages was bog-ore. Sample from Finland.

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Photo credit: © Henri Koskinen / Alamy / Afripics
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Keywords: bog, bog-ore, brown, concretions, ferrous, ferruginous, finland, geology, hematite, historical, history, iron, limonite, material, metal, metallurgy, mineral, mining, mudstone, mudstones, nodule, nodules, ore, oxide, raw, source