mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on the Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (cubic, octahedral, or pyritohedral). Cleavage: Indistinct. Specific gravity: 4.8-5.0.

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

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 (cubic, octahedral, or pyritohedral). 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, often by the precipitation of iron and sulfur from solution.

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 superficial resemblance to gold, pyrite exhibits distinct striations on its crystal faces which helps differentiate it from true gold.

Field identification & locations

Identified by its metallic brass-yellow color, high hardness (scratches glass, unlike gold), brittle tenacity, and greenish-black streak. Found worldwide, notably in Spain, Peru, and the United States.