mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 (Mohs scale); Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2

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

Identified July 21, 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: Poor/Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in a wide variety of environments including sedimentary deposits, metamorphic rocks, and hydrothermal veins. Often found in proximity to quartz and sulfide minerals.

Uses & applications

Historically used for making fire; currently used for the production of sulfur dioxide, sulfuric acid, and as a popular specimen for collectors.

Geological facts

Commonly known as Fool's Gold due to its resemblance to real gold. Unlike gold, pyrite is brittle and leaves a greenish-black streak on a porcelain plate.

Field identification & locations

Identified by its metallic luster and brassy color. Found globally with significant deposits in Spain, Italy, and the USA. Collectors look for well-defined cubic or dodecahedral crystals.