mineral

Pyrite

Iron Sulfide (FeS2)

Hardness of 6-6.5 on the Mohs scale, brassy yellow color with a metallic luster, brittle tenacity, cubic crystal system, indistinct cleavage, and a specific gravity of around 5.0.

Identified July 31, 2026More mineral →

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Physical properties

Hardness of 6-6.5 on the Mohs scale, brassy yellow color with a metallic luster, brittle tenacity, cubic crystal system, indistinct cleavage, and a specific gravity of around 5.0.

Formation & geological history

Forms in a wide variety of geological environments, including hydrothermal veins, sedimentary rocks, and metamorphic rocks, through precipitation from iron- and sulfur-rich fluids.

Uses & applications

Historically used to strike fire, currently used in the manufacture of sulfur and sulfuric acid, and popular among mineral collectors and in jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its metallic golden sheen which has frequently fooled inexperienced prospectors into mistaking it for actual gold.

Field identification & locations

Easily identified by its pale brass-yellow color, high specific gravity, conchoidal to uneven fracture, and dark green-black streak, contrasting with genuine gold's yellow streak.