mineral

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 (Pyrite) / 3.5-4 (Chalcopyrite). Color: Brass-yellow to golden. Luster: Metallic. Crystal Structure: Isometric (Pyrite) or Tetragonal (Chalcopyrite). Streak: Greenish-black to dark gray.

Hardness: 6-6
Color: Brass-yellow to golden
Luster: Metallic

Identified July 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, metamorphic rocks, and as an accessory mineral in igneous rocks, often deposited by hot mineral-rich fluids.

Uses & applications

Used historically as an ore of iron or copper, sulfur production, and widely sold as decorative geological display specimens.

Geological facts

Pyrite is famously known as 'Fool's Gold' due to its metallic luster and brass-yellow hue, which frequently caused inexperienced prospectors to mistake it for real gold.

Field identification & locations

Identified by its high metallic luster, brassy yellow color, brittle nature, and dark greenish-black streak, contrasting with real gold which is malleable and leaves a yellow streak.