Bog ore

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  1. A spongy variety of hydrated oxide of iron and limonite. Found in layers and lumps on level sandy soils that have been covered with swamp or bog. Includes bog iron ore, bog manganese ore, and bog lime, a calcareous deposit of similar origin. See also: brown iron ore
  2. A poorly stratified accumulation of earthy metallic-mineral substances, mainly oxyhydroxides, formed in bogs, marshes, swamps, and other low-lying moist places, by direct chemical precipitation from surface or near-surface percolating waters; specif. "bog iron" and "bog manganese". CF: lake ore

Source: Dictionary of Mining, Mineral, and Related Terms

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