metamorphic
Pyrite-bearing rock (likely pyrite-rich schist or sulfide ore)
Pyrite (FeS₂) in a fine-grained host rock; exact host cannot be determined from the image
AI-generated identification · may be incorrectBrassy metallic flecks in a gray, granular matrix; pyrite has Mohs hardness 6–6.5, cubic crystal structure, and no prominent cleavage. The specimen’s bulk hardness and composition depend on its host rock.
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Physical properties
Brassy metallic flecks in a gray, granular matrix; pyrite has Mohs hardness 6–6.5, cubic crystal structure, and no prominent cleavage. The specimen’s bulk hardness and composition depend on its host rock.
Formation & geological history
Pyrite forms in hydrothermal veins and sedimentary or metamorphic environments; the host may have recrystallized during metamorphism. Its age cannot be established from appearance alone.
Uses & applications
Pyrite-bearing rock is mainly collected as a specimen; pyrite has limited industrial uses as a sulfur source and is not a gold substitute of commercial value.
Geological facts
Pyrite is iron disulfide, commonly called “fool’s gold.” It can occur as distinct cubes, though the visible grains here are too small to assess crystal form.
Field identification & locations
Identify pyrite by its pale brass color and metallic luster; it is harder and more brittle than gold. Common worldwide in sulfide deposits, sedimentary rocks, and metamorphic terrains.
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