mineral

Pyrite

Iron Sulfide (FeS2)

Hardness of 6 to 6.5 on the Mohs scale, brassy yellow color with a metallic luster, opaque, cubic or octahedral crystal structure, no distinct cleavage, and a specific gravity of around 4.8 to 5.0.

Identified August 1, 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 of 6 to 6.5 on the Mohs scale, brassy yellow color with a metallic luster, opaque, cubic or octahedral crystal structure, no distinct cleavage, and a specific gravity of around 4.8 to 5.0.

Formation & geological history

Forms in a wide variety of geological environments, including igneous, metamorphic, and sedimentary rocks, often precipitated from hydrothermal solutions or formed under reducing conditions in marine sediments.

Uses & applications

Historically used for striking fire, currently utilized in the manufacture of sulfur and sulfuric acid, and very popular among mineral collectors and in jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its superficial resemblance to genuine gold, though it can be distinguished by its brassier color, harder texture, and dark streak.

Field identification & locations

Easily identified by its distinctive metallic brassy luster, high density, and cubic crystal habits; found globally with notable deposits in Peru, Spain, and the United States.