mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic, octahedral, or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.88-5.10

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

Identified March 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms in diverse geological environments, including high-temperature hydrothermal veins, as an accessory mineral in igneous rocks, and in sedimentary rocks through biological or chemical precipitation in oxygen-poor environments.

Uses & applications

Used industrially as a source of sulfuric acid and sulfur, occasionally in low-cost jewelry (often marketed as 'marcasite'), and widely collected by mineral enthusiasts for its aesthetic cubic crystals.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to real gold; however, pyrite is harder and leaves a greenish-black streak, whereas gold is soft and leaves a yellow streak. It can create sparks when struck against steel.

Field identification & locations

Identify in the field by its distinct metallic luster, hardness (it cannot be scratched by a copper coin), and its brittle-crushing nature unlike malleable gold. Common locations include Peru, Spain (Rio Tinto), and Italy.