metamorphic
Weathered pyrite-bearing schist or sulfide-rich metamorphic rock
Quartz–mica schist with disseminated pyrite and iron-oxide weathering
AI-generated identification · may be incorrectFine- to medium-grained, dark gray to brown rock with metallic brassy flecks, likely pyrite; mica may produce subtle shimmer and foliation. Hardness is approximately 2–6 depending on minerals; quartz is Mohs 7, pyrite 6–6.5, and mica 2–3, with earthy to metallic luster and irregular fracture.
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Physical properties
Fine- to medium-grained, dark gray to brown rock with metallic brassy flecks, likely pyrite; mica may produce subtle shimmer and foliation. Hardness is approximately 2–6 depending on minerals; quartz is Mohs 7, pyrite 6–6.5, and mica 2–3, with earthy to metallic luster and irregular fracture.
Formation & geological history
Formed when shale or volcanic/sulfide-rich sediment was buried, heated, and deformed during metamorphism; later oxidation produced brown and yellow iron minerals. Exact geological age cannot be determined from the image.
Uses & applications
Used mainly as a decorative or teaching specimen; schist may be quarried locally for landscaping, while pyrite is collected and historically used as a sulfur source.
Geological facts
The brassy grains may be pyrite (“fool’s gold”), though chalcopyrite is another possibility. Rust-colored staining commonly reflects weathering of iron sulfides to limonite and related oxides.
Field identification & locations
Look for planar foliation, mica sparkle, brassy metallic grains, and a dark streak; pyrite is harder and more brittle than gold and does not flatten when scratched. Common in metamorphic belts and hydrothermal ore districts worldwide.
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