mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on the Mohs scale, Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Isometric, Cleavage: Indistinct, Specific Gravity: 4.8-5.0

Hardness: 6-6

Identified July 31, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on the Mohs scale, Color: Pale brass-yellow, Luster: Metallic, Crystal Structure: Isometric, Cleavage: Indistinct, Specific Gravity: 4.8-5.0

Formation & geological history

Forms in a wide variety of geological environments ranging from igneous and metamorphic rocks to sedimentary deposits, often via hydrothermal veins or through the alteration of iron-bearing minerals in reducing environments.

Uses & applications

Used historically for ignition in firearms, currently used in the manufacture of sulfur dioxide and sulfuric acid, and popular among mineral collectors and for lapidary purposes.

Geological facts

Commonly known as 'Fool's Gold' because of its metallic luster and pale yellow hue, which has frequently deceived inexperienced prospectors.

Field identification & locations

Identified by its brassy yellow color, high specific gravity, metallic luster, dark streak, and higher hardness compared to actual gold. Found worldwide, notably in Spain, Peru, Italy, and the United States.