mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic, pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

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

Identified July 5, 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 Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic, pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in diverse environments including magmatic segregation, hydrothermal veins, and sedimentary rocks (as an authigenic mineral). It is often associated with quartz and other sulfides.

Uses & applications

Used in the production of sulfur dioxide, sulfuric acid, and as a popular specimen for mineral collectors. Sometimes used in jewelry (as marcasite).

Geological facts

Commonly known as 'Fool's Gold' because its color and metallic luster often cause it to be mistaken for gold. It has been used since ancient times to create sparks for fire-starting.

Field identification & locations

Identify by its hardness (it can scratch glass, gold cannot) and its greenish-black streak. Commonly found worldwide, with famous deposits in Spain, Peru, and Italy.