mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 Mohs scale. Color: Pale brass-yellow to golden. Luster: Metallic. Crystal Structure: Isometric/Cubic. Cleavage: Indistinct. Specific Gravity: ~5.0.

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

Identified July 19, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs scale. Color: Pale brass-yellow to golden. Luster: Metallic. Crystal Structure: Isometric/Cubic. Cleavage: Indistinct. Specific Gravity: ~5.0.

Formation & geological history

Forms in a variety of environments including sedimentary deposits, metamorphic rocks, and hydrothermal veins. It often crystallizes from sulfur-rich fluids.

Uses & applications

Historically used for fire-starting and sulfur production. Today used for sulfuric acid industrial production, as a minor iron ore, and as a popular specimen for collectors and jewelry.

Geological facts

Commonly known as Fool's Gold due to its resemblance to precious metals. It is unique among minerals for being able to create sparks when struck against steel.

Field identification & locations

Identified by its brassy color, high density, and greenish-black streak (real gold has a yellow streak). Found globally, with famous deposits in Spain, Italy, and Peru.