mineral

Metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly with chalcopyrite and quartz/host rock

AI-generated identification · may be incorrect

Brassy gray-gold metallic luster, irregular massive/granular texture, and no clearly visible crystal faces; pyrite hardness is 6–6.5 Mohs, specific gravity about 5.0. The darker material may be associated sulfides or weathered host rock.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed by hydrothermal mineralization in veins or sulfide-rich sedimentary/metamorphic rocks, generally from Paleozoic to younger geological settings. Exact age and identity require testing.

Uses & applications

Collected as an ore specimen; pyrite is a historical source of sulfur and iron, while associated sulfides may contain copper, lead, zinc, or gold. It has limited jewelry use because it tarnishes and can fracture.

Geological facts

Pyrite is called “fool’s gold,” but it is typically harder, paler, and more brittle than native gold. A streak test, density, and chemical or X-ray analysis would distinguish it from marcasite, chalcopyrite, and gold.

Field identification & locations

Common in hydrothermal veins, coal beds, sedimentary rocks, and metamorphic sulfide deposits worldwide; notable localities include Spain, Peru, Italy, China, and the United States. Avoid tasting or prolonged handling, and test streak on unglazed porcelain only with care.