Where is Pyrite Schist found?
Metamorphic rock with FeS2
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Open the appPyrite Schist 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 Schist
Appalachian Mountains, USA
Extensive exposures of various schists, including pyrite-bearing varieties, are found throughout the Appalachian orogen, particularly in the Piedmont and Blue Ridge provinces.
Scottish Highlands, UK
Numerous metamorphic belts, such as the Dalradian Supergroup, contain schists with pyrite, often associated with metasedimentary sequences.
Fennoscandian Shield, Scandinavia
Ancient Precambrian metamorphic terranes host a variety of schists, including those with significant pyrite content, sometimes linked to volcanogenic massive sulfide (VMS) deposits.
Himalayan Orogen, Asia
High-grade metamorphic rocks, including schists with pyrite, are common in the core of the Himalayan mountain range.
Western Cordillera, North America
Metamorphic complexes in regions like British Columbia and Alaska contain schists with pyrite, often related to arc magmatism and associated hydrothermal systems.
Collecting tips
- Look for Foliation. Schist is defined by its strong foliation (schistosity). Look for rocks that split easily into thin, wavy sheets due to the alignment of platy minerals.
- Identify Metallic Luster. The presence of brassy yellow, metallic crystals within the schist is a key indicator of pyrite. These crystals often stand out against the duller silicate matrix.
- Check for Crystal Forms. Pyrite frequently forms distinctive cubic or pyritohedral crystals. Observe the shape of the metallic grains to confirm they are pyrite.
- Consider Geological Context. Schists are found in metamorphic terrains. Understanding the regional geology can help narrow down potential locations. Look for areas mapped as metamorphic complexes or orogenic belts.
- Acid Test (Caution Advised). While not definitive for pyrite, a drop of dilute HCl will not react with pyrite, distinguishing it from some other sulfide minerals (e.g., pyrrhotite, which reacts weakly). Always exercise caution with acids.
Quick Check
- Color:
- Silvery-gray to dark, with brassy yellow metallic specks.
- Luster:
- Silky/pearly on foliation planes, metallic for pyrite.
- Streak:
- Pyrite: greenish-black to brownish-black. Schist matrix: white to light gray (if quartz/feldspar dominant) or colored (if mica/chlorite dominant).
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