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Where is Pyrite in Quartz Vein found?

FeS2 (Pyrite) in SiO2 (Quartz)

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Pyrite in Quartz Vein 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 Pyrite in Quartz Vein

Sierra Nevada, California, USA

Famous for its gold-quartz veins, where pyrite is a common accessory mineral and often associated with gold.

Timmins, Ontario, Canada

Home to numerous gold mines (e.g., Hollinger, McIntyre) where gold is frequently found in pyrite-rich quartz veins.

Witwatersrand Basin, South Africa

While primarily a paleoplacer deposit, the gold is often associated with detrital pyrite and quartz pebbles, indicating a hydrothermal origin for some of the gold and pyrite in the source rocks.

Various localities in Peru, Chile, and Mexico

Significant producers of base metals and gold, often from hydrothermal quartz-pyrite veins.

Spain (e.g., Rio Tinto)

Known for massive sulfide deposits where pyrite is abundant, often in quartz-rich matrices.

Collecting tips

  1. Look for Vein Systems. Focus on areas with visible quartz veins cutting through host rocks, especially in regions known for past or present mining activity.
  2. Identify Alteration Zones. Hydrothermal systems often cause alteration in the surrounding host rock (e.g., sericitization, silicification, pyritization). Look for these altered zones near quartz veins.
  3. Check Mine Dumps and Outcrops. Old mine dumps are excellent places to find samples. Examine natural outcrops where veins are exposed by erosion.
  4. Use a Hand Lens. A hand lens (10x magnification) will help identify the characteristic crystal forms of pyrite and the texture of the quartz.
  5. Test Hardness and Streak. Pyrite is harder than a steel knife (Mohs 6-6.5) and leaves a greenish-black streak. Gold is much softer (Mohs 2.5-3) and leaves a golden-yellow streak. Quartz is harder than pyrite (Mohs 7) and leaves a white streak.

Quick Check

Color:
Brassy yellow metallic crystals (pyrite) in white to clear glassy matrix (quartz).
Luster:
Metallic (pyrite) and Vitreous (quartz).
Streak:
Greenish-black (pyrite); White (quartz).

Explore Pyrite in Quartz Vein

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Full guide to Pyrite in Quartz Vein

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