mineral

Pyrite-bearing quartz vein rock

Pyrite (FeS₂) with quartz (SiO₂), likely in a schistose or altered host rock

AI-generated identification · may be incorrect

Brassy metallic patches suggest pyrite; pale gray, glassy areas are quartz. Pyrite hardness 6–6.5, metallic luster, cubic crystal system, no cleavage; quartz hardness 7, vitreous luster, hexagonal structure. The specimen is strongly fractured and weathered.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when hydrothermal fluids deposited sulfide minerals and quartz in fractures, commonly during metamorphism or igneous-related mineralization. Its exact geological age cannot be determined from the photograph.

Uses & applications

Pyrite is an iron sulfide ore and collector mineral; quartz is used in glass, electronics, abrasives, and construction. Attractive pieces may be sold as mineral specimens, though this example appears common and heavily weathered.

Geological facts

Pyrite is often called “fool’s gold,” but it is usually paler, harder, and more brittle than native gold; its streak is greenish-black rather than yellow. Oxidation can produce sulfuric acid and rusty iron oxides.

Field identification & locations

Look for metallic brassy luster, black-green streak, brittle fracture, and possible cubic pyrite faces; a streak and hardness test can confirm it. Common in hydrothermal veins and metamorphic sulfide deposits worldwide.