Where is Limonite after Pyrite with Quartz found?
Limonite (pseudomorph after Pyrite) and Quartz
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Open the appLimonite after Pyrite with Quartz 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 after Pyrite with Quartz
Worldwide
Limonite pseudomorphs after pyrite are common globally wherever pyrite-bearing rocks have undergone weathering. Notable localities include various mining districts in the USA (e.g., Colorado, Arizona), Spain (e.g., Rio Tinto), Peru, and many other countries with significant sulfide mineralization.
Collecting tips
- Look in Weathered Zones. Search in the oxidized caps (gossans) of sulfide ore deposits, stream beds, and areas with weathered sedimentary rocks that once contained pyrite.
- Identify Pyrite Forms. Look for the characteristic cubic, pyritohedral, or octahedral shapes, even if the color is rusty brown instead of metallic yellow.
- Check for Associated Minerals. Quartz is a common associate, so look for its characteristic crystal forms or granular masses alongside the limonite pseudomorphs.
Quick Check
- Color:
- Rusty brown to yellowish-brown (limonite), colorless to white (quartz)
- Luster:
- Earthy to dull (limonite), vitreous (quartz)
- Streak:
- Yellowish-brown to brownish-yellow (limonite); white (quartz)
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