Where is Pyrite in host rock found?
Pyrite (FeS2) in a fine-grained metamorphic or sedimentary rock
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Open the appPyrite in host rock 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 host rock
Navajún, La Rioja, Spain
Famous for producing world-class, perfectly formed cubic pyrite crystals embedded in a marl matrix.
Elba Island, Italy
Known for excellent pyrite crystals, often associated with hematite, in metamorphic rocks.
Various coal-bearing strata worldwide
Pyrite concretions and disseminated grains are common in shales and coals due to reducing conditions and abundant organic matter (e.g., Pennsylvania, USA; Ruhr Valley, Germany).
Black shales and slates
Widespread occurrence in fine-grained, organic-rich sedimentary and low-grade metamorphic rocks globally (e.g., Appalachian Basin, USA; British Isles).
Collecting tips
- Look for metallic luster. Pyrite's distinctive brassy metallic luster is often the first indicator, especially when contrasted with a duller host rock.
- Examine crystal forms. Well-formed cubic or pyritohedral crystals are characteristic of pyrite and can be visible even in fine-grained matrices.
- Check for associated minerals. Pyrite often co-occurs with other sulfide minerals, quartz, calcite, and carbonaceous material, depending on the environment.
- Consider the geological context. Search in areas known for anoxic sedimentary deposition (e.g., black shales) or hydrothermal alteration/metamorphism.
- Perform a streak test. Pyrite leaves a greenish-black streak, which helps differentiate it from gold (yellow streak) and chalcopyrite (greenish-black streak, but softer).
Quick Check
- Color:
- Brassy yellow to golden (pyrite) in a variable host rock
- Luster:
- Metallic (pyrite) in a dull to silky host rock
- Streak:
- Greenish-black (pyrite)
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