sedimentary

Limonite Bog Iron

Hydrated iron oxide-hydroxide, FeO(OH)·nH2O

AI-generated identification · may be incorrect

Hardness: 4 to 5.5 on the Mohs scale. Color: Brown, yellowish-brown, or reddish-brown. Luster: Earthy to submetallic. Crystal structure: Amorphous to microcrystalline. Streak: Yellowish-brown.

Hardness: 4 to 5
Color: Brown, yellowish-brown, or reddish-brown
Luster: Earthy to submetallic

Identified August 1, 2026More sedimentary →

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Physical properties

Hardness: 4 to 5.5 on the Mohs scale. Color: Brown, yellowish-brown, or reddish-brown. Luster: Earthy to submetallic. Crystal structure: Amorphous to microcrystalline. Streak: Yellowish-brown.

Formation & geological history

Formed through the chemical or biochemical precipitation of iron in shallow lakes, bogs, and swamps, often facilitated by iron-reducing bacteria, typically dating from various geological periods including the Quaternary.

Uses & applications

Historically used as a minor ore for iron production; currently collected by mineral enthusiasts and used in educational displays.

Geological facts

Bog iron was one of the primary sources of iron for early European settlers in North America, utilized extensively in local blacksmithing and manufacturing before the development of deep-mine iron ore extraction.

Field identification & locations

Found in damp, boggy lowlands, near streams or wetland environments worldwide. Identified by its characteristic brownish-red rusty coloration, heavy weight relative to size, and earthy texture.