mineral

Pyrite

Iron Disulfide (FeS2)

Mohs hardness: 6-6.5; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal system: Isometric/Cubic; Cleavage: Poor; Specific gravity: 4.9-5.2

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

Identified July 12, 2026More mineral →

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Physical properties

Mohs hardness: 6-6.5; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal system: Isometric/Cubic; Cleavage: Poor; Specific gravity: 4.9-5.2

Formation & geological history

Formed in diverse geological settings including hydrothermal veins, sedimentary rocks through biological activity, and as an accessory mineral in igneous rocks. Found in strata ranging from Precambrian to Holocene.

Uses & applications

Historically used for starting fires and for the production of sulfuric acid. Today, it is primarily of interest to collectors and used occasionally in jewelry (often misnamed as marcasite).

Geological facts

Due to its metallic luster and pale brass-yellow hue, it is famously known as 'Fool\'s Gold.' It is the most common sulfide mineral on Earth.

Field identification & locations

Identified by its brassy color, high density, and brittle nature (unlike real gold which is malleable). Commonly found in Spain, Italy, Kazakhstan, and throughout North America.