Where is Pyrite found?
Pyrite (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
Renowned for producing some of the world's most perfect, large, and aesthetically pleasing cubic pyrite crystals, often embedded in marl.
Elba Island, Italy
Famous for well-formed pyrite crystals, often with iridescent tarnish.
Huánuco Department, Peru
Known for producing excellent pyrite specimens, including large, sharp crystals and aggregates.
Leadville, Colorado, USA
Historically significant mining district where pyrite is found in association with other sulfide ores.
Various coal seams and black shales worldwide
Pyrite concretions and disseminated crystals are common in these sedimentary environments, often forming through diagenetic processes.
Collecting tips
- Look for Metallic Luster. Pyrite's strong metallic luster is a key identifier. It will reflect light much more brightly than most other minerals.
- Check for Crystal Form. Well-formed cubic, octahedral, or pyritohedral crystals are highly characteristic of pyrite. Look for striations on cubic faces.
- Perform a Streak Test. Pyrite leaves a greenish-black to brownish-black streak on an unglazed porcelain plate, which distinguishes it from gold (yellow streak) and chalcopyrite (greenish-black streak).
- Consider Hardness. Pyrite is relatively hard (6-6.5 on Mohs scale), meaning it cannot be scratched by a steel knife or a copper coin, unlike gold (2.5-3) or chalcopyrite (3.5-4).
- Assess Specific Gravity. Pyrite is dense (4.95-5.02 g/cm³), feeling noticeably heavy for its size, though less dense than gold (19.3 g/cm³).
- Environmental Context. Pyrite is often found in association with other sulfide minerals in hydrothermal veins, or as concretions in sedimentary rocks like shales and coal.
Quick Check
- Color:
- Brassy yellow
- Luster:
- Metallic
- Streak:
- Greenish-black to brownish-black
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