mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6.0-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedron); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

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

Identified June 4, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedron); 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 found throughout technical evolutionary history across billions of years.

Uses & applications

Primarily used as an ore of sulfur for sulfuric acid production; also used in costume jewelry (marcasite) and as an ornamental gemstone for collectors and metaphysical purposes.

Geological facts

Commonly known as Fool's Gold due to its resemblance to gold. Unlike gold, pyrite is brittle and leaves a greenish-black streak on a streak plate. It can spark when struck against steel.

Field identification & locations

Identify in the field by its metallic brassy luster, cubic crystal habit, and high hardness (it cannot be scratched by a copper coin or steel knife). Found globally, with notable deposits in Spain, Peru, and the USA.