mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal System: Isometric (cubic, pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

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

Identified July 5, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal System: Isometric (cubic, pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in a variety of geological environments including sedimentary rocks as nodules, in hydrothermal veins alongside other sulfides, and in metamorphic rocks. It can form at high or low temperatures.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used as an ornamental stone, a collector's mineral, and sometimes as a minor ore of gold when the two occur together.

Geological facts

Known as 'Fool's Gold' because its color and weight are similar to gold. Unlike gold, pyrite is brittle and cannot be scratched by a copper penny. It can create sparks when struck against steel.

Field identification & locations

Identify by its brassy color, cubic crystal habit, and blackish-green streak. Common worldwide, with famous deposits in Spain (Rio Tinto), Italy, and Peru. It is often found in coal beds and shale.