mineral

Pyrite-bearing rock (likely pyrite in a quartz-rich matrix)

Pyrite, FeS₂, with an unidentified host rock

AI-generated identification · may be incorrect

Brassy metallic flecks and crystals in a gray, rough matrix; pyrite has Mohs hardness 6–6.5, cubic crystal structure, and no true cleavage. The specimen’s overall properties depend on its host rock.

Identified October 5, 2026More mineral →

Explore Pyrite-bearing rock (likely pyrite in a quartz-rich matrix) in the encyclopedia →

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Physical properties

Formation & geological history

Pyrite forms in varied settings, including hydrothermal veins and sedimentary rocks, when iron and sulfur react under low-oxygen conditions. The image does not reveal the specimen’s age or precise formation environment.

Uses & applications

Pyrite is collected for its metallic crystals and used as a source of sulfur in some industrial processes; this small rough piece is primarily a display or teaching specimen.

Geological facts

Pyrite is often called “fool’s gold,” but it is harder and more brittle than gold and commonly forms cubic crystals.

Field identification & locations

The glittering brassy grains suggest pyrite, though the image is insufficient to identify the gray host or confirm the mineral. Typical localities include hydrothermal veins and sedimentary deposits worldwide; a fresh streak is dark greenish-black, unlike gold’s yellow streak.