bog iron
A surname.
Not vitreous.
superlative form of mild: most mild
(geology) deposits of mixed oxides and hydroxides of iron formed when iron-bearing groundwater emerges onto the surface
初期の入植者たちは、沼地の縁にある泥炭地で形成された鉄の堆積物を集め、それを精錬して道具や釘にしました。
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