Where is Quartz with Pyrite found?
SiO2 (Quartz) with FeS2 (Pyrite)
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Open the appQuartz with 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 Quartz with Pyrite
Worldwide in hydrothermal vein systems
Common in gold, silver, copper, and lead-zinc deposits globally. Notable occurrences include the Mother Lode in California (USA), various deposits in Peru, Mexico, Australia, and Canada.
Porphyry Copper Deposits
Large, low-grade copper deposits often associated with intrusive igneous rocks, where pyrite is a common accessory mineral within quartz veins and disseminations (e.g., Chuquicamata, Chile; Bingham Canyon, USA).
Volcanogenic Massive Sulfide (VMS) Deposits
Formed on or below the seafloor in volcanic settings, these deposits often contain significant pyrite and quartz (e.g., Kidd Creek, Canada; Kuroko deposits, Japan).
Sedimentary Rocks
Pyrite can form diagenetically in shales, coals, and other organic-rich sediments, sometimes associated with authigenic quartz or as concretions. However, this association is typically less prominent than in hydrothermal settings.
Collecting tips
- Look for Veins. Quartz with pyrite is most commonly found in quartz veins cutting through host rocks, especially in areas known for metallic mineral deposits.
- Identify Alteration Zones. Hydrothermal alteration (e.g., sericitization, silicification, pyritization) often accompanies the formation of quartz-pyrite assemblages. Look for discolored or altered host rocks.
- Check Mine Dumps and Prospect Pits. Historical mining areas are excellent places to find specimens, as miners often discarded material not rich enough in the primary ore metal.
- Use a Hand Lens. A hand lens (10x magnification) is invaluable for identifying small pyrite crystals embedded within quartz and observing their characteristic metallic luster and crystal forms.
Quick Check
- Color:
- Quartz: Variable (clear, white, gray, etc.); Pyrite: Brassy yellow.
- Luster:
- Quartz: Vitreous; Pyrite: Metallic.
- Streak:
- Quartz: White; Pyrite: Greenish-black to brownish-black.
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