Where is Iron Ore found?
Iron Ore (likely Limonite/Goethite with Quartz)
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Open the appIron Ore occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Iron Ore
Mesabi Range, Minnesota, USA
Historically a major source of iron ore, including taconite (a low-grade iron formation containing magnetite and hematite with quartz), but also secondary enrichment zones with hydrated iron oxides.
Krivoy Rog, Ukraine
Significant deposits of iron ore, including both high-grade hematite and lower-grade hydrated iron oxides.
Carajás Mine, Pará, Brazil
Known for high-grade hematite, but weathering processes can lead to the formation of hydrated iron oxides in surficial zones.
Pilbara Region, Western Australia
World-class iron ore deposits, predominantly hematite, but also includes goethite-rich ores formed through supergene enrichment.
Bog Iron Deposits (worldwide)
Found in temperate and boreal regions, forming in swamps, bogs, and shallow lakes where iron-rich groundwater precipitates hydrated iron oxides.
Collecting tips
- Look for Rusty Stains. Limonite/Goethite often stains surrounding rocks and soil a characteristic yellowish-brown to reddish-brown color due to its iron content. This can be a good indicator of its presence.
- Check for Earthy or Dull Luster. Unlike metallic iron ores like hematite or magnetite, limonite/goethite typically has an earthy, dull, or submetallic luster. The quartz component will be glassy.
- Test the Streak. Limonite/Goethite produces a yellowish-brown to brownish-yellow streak, which is a key diagnostic feature to distinguish it from hematite (red streak) or magnetite (black streak).
- Consider the Geological Environment. Search in areas with evidence of weathering of iron-rich rocks, bogs, swamps, or areas with gossans (oxidized caps of sulfide deposits).
- Assess Hardness. Limonite/Goethite is relatively soft (4-5.5 on Mohs scale), while the associated quartz will be harder (7). This difference can be felt when scratching.
Quick Check
- Color:
- Yellowish-brown to dark brown/black (Limonite/Goethite); colorless/white/grey (Quartz)
- Luster:
- Earthy, dull, submetallic (Limonite/Goethite); vitreous (Quartz)
- Streak:
- Yellowish-brown to brownish-yellow
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