Where is Limonite pseudomorph after Pyrite found?
Limonite (Fe2O3·nH2O) pseudomorph after Pyrite (FeS2)
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Open the appLimonite pseudomorph after Pyrite 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 Limonite pseudomorph after Pyrite
Rio Tinto, Spain
Famous for its massive sulfide deposits and extensive gossans, where excellent limonite pseudomorphs after pyrite can be found.
Various localities in the United States (e.g., Colorado, Arizona, Missouri)
Common in the oxidized caps of many base metal sulfide deposits across the western and central U.S.
Germany (e.g., Siegerland)
Historical mining districts have yielded fine examples of these pseudomorphs.
England (e.g., Cornwall)
Known for its polymetallic ore deposits, which often feature oxidized zones with pseudomorphs.
Collecting tips
- Look in Oxidized Zones. Focus on the weathered upper portions of sulfide ore bodies (gossans) or areas where pyrite-rich rocks have been exposed to the elements.
- Identify Pyrite Shapes. Search for specimens that clearly show the characteristic cubic, pyritohedral, or octahedral forms of pyrite, but with a brownish, earthy appearance.
- Check for Weight. While limonite is less dense than pyrite, these pseudomorphs can still feel relatively heavy for their size due to the iron content.
- Test the Streak. A yellowish-brown to brownish-black streak is a key indicator for limonite.
Quick Check
- Color:
- Brownish-yellow to dark brown
- Luster:
- Earthy to dull
- Streak:
- Yellowish-brown to brownish-black
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