Where is Quartz with Pyrite and Iron Staining found?
SiO2 (Quartz) with FeS2 (Pyrite) and Iron Oxides
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Open the appQuartz with Pyrite and Iron Staining 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 Quartz with Pyrite and Iron Staining
Worldwide in sulfide ore deposits
Commonly found in the oxidized caps (gossans) of massive sulfide deposits, porphyry copper deposits, and epithermal gold-silver deposits. Examples include Butte, Montana, USA; Rio Tinto, Spain; and various localities in the Andes.
Sedimentary environments
Found in shales, sandstones, and coal seams where pyrite has formed diagenetically and subsequently oxidized upon exposure to weathering. Examples include the Appalachian Basin, USA.
Metamorphic terrains
Occurs in schists and gneisses where pyrite was present and later oxidized. Examples include various metamorphic belts globally.
Collecting tips
- Look for rusty outcrops. Iron staining is a key indicator. Look for reddish-brown or yellowish-brown discoloration on rock surfaces, especially near old mine workings or areas known for sulfide mineralization.
- Examine quartz veins. Many hydrothermal ore deposits are hosted in quartz veins. Inspect these veins for metallic minerals like pyrite and associated iron staining.
- Check for cubic crystals. Pyrite often forms distinctive cubic or octahedral crystals. Look for these brassy-yellow metallic crystals embedded in or associated with quartz.
- Consider the geological context. Understanding the local geology, particularly the presence of sulfide-rich rocks or hydrothermal alteration, increases the chances of finding such specimens.
Quick Check
- Color:
- Clear to milky quartz with brassy yellow pyrite and rusty red/brown staining.
- Luster:
- Vitreous (quartz), metallic (pyrite), dull/earthy (iron staining).
- Streak:
- White (quartz), greenish-black (pyrite), reddish-brown to yellowish-brown (iron oxides).
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