mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on the Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric. Cleavage: Indistinct. Specific gravity: 4.8-5.0.

Hardness: 6-6
Color: Pale brass-yellow
Luster: Metallic

Identified August 2, 2026More mineral →

Explore Pyrite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-6.5 on the Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric. Cleavage: Indistinct. Specific gravity: 4.8-5.0.

Formation & geological history

Forms in a wide variety of geological conditions, including sedimentary, igneous, and metamorphic rocks, typically through hydrothermal veins or sedimentary deposition in low-oxygen environments.

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

Often called 'Fool's Gold' due to its superficial resemblance to gold; however, pyrite is much harder, brittle, and leaves a greenish-black streak.

Field identification & locations

Easily identified by its brassy yellow color, metallic luster, high hardness (scratches glass), and greenish-black streak. Found worldwide, notably in Peru, Spain, and the United States.