Bog ore

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(Min.) An ore of iron found in boggy or swampy land; a variety of brown iron ore, or limonite.
Bog manganese, the hydrated peroxide of manganese.

See also: bog, bog

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Output of iron ore began even earlier, lake and bog ore having been worked at least 2,000 years ago.
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