mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 (Mohs scale); Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.9-5.2; Streak: Greenish-black

Hardness: 6-6
Color: Brass-yellow
Luster: Metallic

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs scale); Color: Brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.9-5.2; Streak: Greenish-black

Formation & geological history

Forms in a variety of environments, including sedimentary rocks via hydrothermal veins, as an accessory mineral in igneous rocks, and in metamorphic rocks. Commonly associated with sulfides and coal beds.

Uses & applications

Historically used to create sparks for wheel-lock guns; currently used for the production of sulfuric acid, iron sulfate, and as a popular mineral specimen for collectors.

Geological facts

Known as 'Fool's Gold' because its color and weight can lead novice prospectors to mistake it for real gold. Despite the name, it occasionally contains small amounts of actual gold within its matrix.

Field identification & locations

Identify by its brassy color, cubic crystal habit, and high hardness (it can scratch glass, whereas gold cannot). It is found globally across all seven continents.