Where is Pyrite found?
Iron disulfide (FeS2)
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Open the appPyrite 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
Navajún, La Rioja, Spain
Famous for producing some of the world's most perfect, large, and sharply formed cubic pyrite crystals, often embedded in marl.
Elba Island, Italy
Known for well-formed pyrite crystals, including dodecahedral and octahedral habits, often associated with hematite.
Huánuco Department, Peru
Produces excellent pyrite specimens, often in association with other sulfide minerals, exhibiting various crystal habits.
Leadville, Colorado, USA
Historically significant mining district where pyrite is found in hydrothermal vein deposits, often with other base metal sulfides.
Various coal seams worldwide
Pyrite is a common accessory mineral in coal, forming nodules, concretions, and disseminated grains within the organic matrix.
Collecting tips
- Look for Metallic Luster. Pyrite's bright, metallic luster is a key identifier. It often stands out against duller host rocks.
- Observe Crystal Habits. Cubic, octahedral, or pyritohedral crystals are very characteristic of pyrite. Look for striations on cube faces.
- Perform a Streak Test. A greenish-black to brownish-black streak is diagnostic for pyrite and helps distinguish it from gold (yellow streak) and chalcopyrite (greenish-black streak).
- Check Hardness. Pyrite is harder than gold (2.5-3) and chalcopyrite (3.5-4), with a Mohs hardness of 6-6.5. It will scratch glass and cannot be scratched by a knife.
- Consider Geological Context. Pyrite is common in hydrothermal veins, sedimentary rocks (especially black shales and coal), and metamorphic rocks. Knowing the local geology can aid identification.
Quick Check
- Color:
- Brassy yellow
- Luster:
- Metallic
- Streak:
- Greenish-black to brownish-black
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