mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified July 31, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in a wide variety of geological environments, from hydrothermal veins to sedimentary rocks and replacement deposits, often under reducing conditions.

Uses & applications

Historically used to strike fire, currently used in the manufacture of sulfur and sulfuric acid, and widely collected as a mineral specimen.

Geological facts

Commonly known as 'Fool's Gold' due to its superficial resemblance to gold, though pyrite is much harder and leaves a greenish-black streak.

Field identification & locations

Easily identified by its brassy yellow metallic luster, cubic crystal habit, and high specific gravity. Found worldwide, notably in Peru, Spain, and the United States.