metamorphic
Pyrite-bearing schist
Likely pyrite (FeS₂) in a mica-rich schist; exact identification requires testing
AI-generated identification · may be incorrectBrassy metallic grains and reflective, platy foliation suggest pyrite with mica. Pyrite is Mohs 6–6.5, cubic, and lacks cleavage; mica is softer (about 2–3) with perfect basal cleavage. The specimen’s bulk properties cannot be determined from the photo.
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Physical properties
Brassy metallic grains and reflective, platy foliation suggest pyrite with mica. Pyrite is Mohs 6–6.5, cubic, and lacks cleavage; mica is softer (about 2–3) with perfect basal cleavage. The specimen’s bulk properties cannot be determined from the photo.
Formation & geological history
Likely formed when clay-rich sediment was metamorphosed under heat and pressure, with pyrite crystallizing during or after metamorphism. Its age and precise formation setting are unknown from appearance alone.
Uses & applications
Primarily a collector specimen; pyrite is also an iron sulfide ore and is used in some industrial chemical processes. Mica-rich schist has limited decorative and local building-stone uses.
Geological facts
Pyrite is commonly called fool’s gold, but its brassy color and metallic luster can resemble gold.
Field identification & locations
Look for foliated, shiny mica layers and harder brassy grains; pyrite may show cubic crystals and leaves a dark streak, unlike gold. Similar specimens occur in metamorphic belts worldwide; confirm with a streak and hardness test.
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