metamorphic
Likely pyrite-bearing metamorphic rock
Quartz–mica schist or phyllite with disseminated pyrite (FeS₂)
AI-generated identification · may be incorrectSilvery-gray, sparkly, and foliated-looking; likely quartz and mica with brassy metallic pyrite. Quartz has Mohs hardness 7, mica 2–3, and pyrite 6–6.5; pyrite is cubic but crystals are not clearly visible here.
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Physical properties
Silvery-gray, sparkly, and foliated-looking; likely quartz and mica with brassy metallic pyrite. Quartz has Mohs hardness 7, mica 2–3, and pyrite 6–6.5; pyrite is cubic but crystals are not clearly visible here.
Formation & geological history
Probably formed when clay-rich sediment was regionally metamorphosed, with pyrite crystallizing during or after metamorphism. Exact age and locality cannot be determined from the photograph.
Uses & applications
Decorative and educational specimen; pyrite-bearing schist has little industrial value, while schist may occasionally be used as aggregate or dimension stone.
Geological facts
The glitter may be mica rather than abundant pyrite; pyrite is heavier, brassy-yellow, and leaves a dark streak, whereas mica flakes are flexible and separate into sheets.
Field identification & locations
Look for planar foliation, flaky mica, quartz-rich patches, and hard brassy grains; a streak, hardness, magnetism, and acid test can improve identification. Common in regional metamorphic belts worldwide.
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