Where is Goethite found?
α-FeO(OH)
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Open the appGoethite 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 Goethite
Iron Ranges, Lake Superior Region, USA
Significant deposits of goethite, often associated with hematite, in banded iron formations.
Siegerland, Germany
Classic locality for well-crystallized goethite, particularly fibrous and botryoidal forms.
Cornwall, England
Found in the oxidation zones of numerous polymetallic ore deposits.
Minas Gerais, Brazil
Extensive lateritic iron ore deposits where goethite is a major component.
Various bog iron deposits worldwide
Goethite is the primary mineral in these surficial accumulations.
Collecting tips
- Look for Rusty Colors. Goethite's characteristic yellowish-brown to reddish-brown color is a key indicator. It often forms rusty coatings or masses.
- Check for Fibrous or Botryoidal Habits. Many goethite specimens exhibit a distinctive fibrous (needle-like) or botryoidal (grape-like) texture, especially in cavities or as coatings.
- Perform a Streak Test. The yellowish-brown streak is a crucial diagnostic property that distinguishes it from other iron oxides like hematite (red streak).
- Examine Geological Context. Goethite is common in weathered zones of iron-rich rocks, gossans over sulfide deposits, and boggy environments. Understanding the local geology can guide your search.
Quick Check
- Color:
- Yellowish-brown to dark brown/black
- Luster:
- Dull, earthy, silky, or submetallic
- Streak:
- Yellowish-brown
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