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 August 4, 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

Formed in a wide variety of geological environments from hydrothermal veins to sedimentary rocks and metamorphic rocks, often crystallizing at high and low temperatures.

Uses & applications

Historically used to strike fire, currently used in the manufacture of sulfur and sulfuric acid, and popular among mineral collectors and in jewelry.

Geological facts

Often called 'Fool's Gold' because of its metallic luster and pale yellow hue, which has frequently confused inexperienced prospectors.

Field identification & locations

Easily identified by its brassy yellow color, high specific gravity, metallic luster, and characteristic dark greenish-black streak. Found worldwide, notably in Peru, Spain, and the USA.