metamorphic
Pyrite-bearing rock (likely pyrite-rich schist or quartz-bearing sulfide ore)
Pyrite (FeS₂) in a rock matrix; exact host rock cannot be confirmed from the photo
AI-generated identification · may be incorrectBrassy metallic grains with a dark, uneven matrix; pyrite has Mohs hardness 6–6.5, cubic crystals when well formed, and no prominent cleavage. The specimen’s bulk hardness, density, and composition depend on its host rock.
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Physical properties
Brassy metallic grains with a dark, uneven matrix; pyrite has Mohs hardness 6–6.5, cubic crystals when well formed, and no prominent cleavage. The specimen’s bulk hardness, density, and composition depend on its host rock.
Formation & geological history
Pyrite forms in many settings, including sedimentary basins, hydrothermal veins, and metamorphic rocks; the image does not establish the host or age. Pyrite can grow as fluids precipitate iron sulfide or during sediment alteration and metamorphism.
Uses & applications
Pyrite-bearing rock is mainly collected as a display specimen; pyrite is also a source of sulfur for chemical production, though it is not commonly mined for iron.
Geological facts
Pyrite is nicknamed “fool’s gold,” but it is harder and more brittle than gold and often forms angular or cubic crystals.
Field identification & locations
Look for a brassy metallic sheen and brittle, angular grains; a streak test produces a dark greenish-black to brownish-black powder. Similar-looking chalcopyrite is softer, while identification of the dark host requires closer examination.
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