mineral

Pyrite

Iron Sulfide (FeS2)

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

Hardness: 6-6

Identified August 2, 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 (cubic), Cleavage: Indistinct, Specific Gravity: 4.8-5.0

Formation & geological history

Forms in a wide variety of geological environments, including hydrothermal veins, sedimentary rocks, and metamorphic rocks, as well as in the replacement of fossils.

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

Commonly known as 'Fool's Gold' due to its brassy yellow color and high metallic luster which often confused inexperienced prospectors.

Field identification & locations

Easily identified by its brass-yellow color, metallic luster, high hardness (scratches glass), and dark brownish-black streak. Found worldwide, notably in Peru, Spain, and the United States.