from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology deposits of mixed oxides and hydroxides of iron formed when iron-bearing groundwater emerges onto the surface


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