mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on 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 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 settings, from sedimentary rocks like shales and coal beds to hydrothermal vein deposits and metamorphic rocks, typically precipitated from aqueous solutions.

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

Familiar as 'Fool's Gold' due to its superficial resemblance to gold, pyrite frequently forms striking natural cubic crystals.

Field identification & locations

Easily identified by its brass-yellow color, metallic luster, high specific gravity, and the fact that it cannot be scratched by a knife (unlike real gold). Found worldwide, with notable deposits in Spain, Peru, Italy, and the USA.