Bog Iron

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A workable, porous type of brown hematite (impure hydrous oxides) found in bogs (and also in marshes, swamps, peat mosses, and shallow lake beds). This deposit is formed when iron-bearing surface waters come into contact with organic material and iron oxides are precipitated through oxidation of algae, iron bacteria, or the atmosphere. It is frequently found in areas with subarctic or arctic climatic conditions.