bog iron ore

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limonite

limonite (līmˈənīt) or brown hematite (hĕmˈətīt, hēˈ–), yellowish to dark brown mineral, a hydrated oxide of iron, FeO(OH)·nH2O, occurring commonly in deposits of secondary origin, i.e., those formed by the alteration of minerals containing iron. Both iron rust and bog iron ore are limonite. It serves as a pigment (see ocher) and as an ore of iron. It is found mainly in Austria and England.
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bog iron ore

[′bäg ¦ī·ərn ‚ȯr]
(mineralogy)
A soft, spongy, porous deposit of impure hydrous iron oxides formed in bogs, marshes, swamps, peat mosses, and shallow lakes by precipitation from iron-bearing waters and by the oxidation action of algae, iron bacteria, or the atmosphere. Also known as lake ore; limnite; marsh ore; meadow ore; morass ore; swamp ore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Bog iron forms when iron-rich waters" seeping from a bog are exposed to oxygenated air.--Sid Perkins
Bog iron was discovered just southwest of the plateau, and a mining operation was opened at nearby Salisbury.