mineral
Likely pyrite-bearing rock
Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix
AI-generated identification · may be incorrectThe small specimen appears pale brassy and metallic with granular, sparkling surfaces. Pyrite has Mohs hardness 6–6.5, cubic crystal structure, no true cleavage, and specific gravity about 5; the photo alone does not confirm the identification or matrix.
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Physical properties
The small specimen appears pale brassy and metallic with granular, sparkling surfaces. Pyrite has Mohs hardness 6–6.5, cubic crystal structure, no true cleavage, and specific gravity about 5; the photo alone does not confirm the identification or matrix.
Formation & geological history
Pyrite forms in hydrothermal veins and sedimentary or metamorphic rocks under varied conditions; its age depends on the host deposit.
Uses & applications
Pyrite is collected and studied as an ore-associated mineral; it has limited modern use as an iron or sulfur source and is not typically used as a gemstone.
Geological facts
Pyrite is commonly called fool’s gold, but its pale brass color and brittle, often granular or cubic forms distinguish it from gold.
Field identification & locations
Look for a brassy metallic sheen and brittle fracture; gold is softer, malleable, and leaves a yellow streak, while pyrite typically leaves a dark greenish-black streak. It occurs worldwide in sulfide deposits and sedimentary rocks.
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