mineral
Likely pyrite-bearing rock fragment
Pyrite (FeS₂), possibly in a rock matrix
AI-generated identification · may be incorrectSmall, rough gray-brown fragment with a brassy metallic-looking area; exact hardness, luster, crystal form, and composition cannot be confirmed from the image. Pyrite has Mohs hardness 6–6.5 and a cubic crystal structure.
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Physical properties
Small, rough gray-brown fragment with a brassy metallic-looking area; exact hardness, luster, crystal form, and composition cannot be confirmed from the image. Pyrite has Mohs hardness 6–6.5 and a cubic crystal structure.
Formation & geological history
Pyrite forms in many settings, including hydrothermal veins and sedimentary rocks; its age depends on the host material and cannot be determined visually.
Uses & applications
Pyrite is collected as a mineral specimen and is used in geological study; historically, it was a source of sulfur and iron, though rarely an iron ore today.
Geological facts
Pyrite is often called fool’s gold, but this specimen is too small and indistinct for reliable identification from appearance alone.
Field identification & locations
Check for a brass-yellow streak and brittle fracture; pyrite is harder than a knife blade. It occurs worldwide in sedimentary rocks, veins, and metamorphic settings.
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