mineral

Likely pyrite-bearing rock or pyrite fragment

Pyrite (FeS₂), possibly mixed with quartz or carbonate matrix

AI-generated identification · may be incorrect

Brassy metallic-gold, irregular granular surface; pyrite hardness 6–6.5 Mohs, brittle, cubic crystal system, no prominent cleavage, specific gravity about 5.0. The image is too small to confirm crystal faces or distinguish pyrite from chalcopyrite.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins and sedimentary environments by sulfide precipitation, commonly from Paleozoic marine rocks. Around 43.1°N, 77.6°W (western New York), sulfide-bearing glacially transported material is plausible, though a local source cannot be established visually.

Uses & applications

Collected as a mineral specimen; pyrite is used historically as a sulfur source and in chemical manufacture, but is not typically used as jewelry because it tarnishes and can oxidize.

Geological facts

Often called “fool’s gold.” Pyrite is usually paler and harder than chalcopyrite; a steel scratch should not easily powder it, while streak is greenish-black to brown-black.

Field identification & locations

Look for a metallic luster, brassy color, dark streak, and cubic or granular forms. Test cautiously with hardness and streak tests; avoid prolonged moisture because oxidation can produce acidic products.