mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6.0-6.5 Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/indistinct; Specific Gravity: 4.8-5.0

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

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5 Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Formed in diverse geological settings through hydrothermal activity, sedimentation in oxygen-poor environments, and as an accessory mineral in igneous and metamorphic rocks across all geological ages.

Uses & applications

Historically used for fire-starting and the production of sulfuric acid; currently used in lithium batteries, as a detector in early radio receivers, and widely in jewelry and mineral collecting.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to gold; it was used in wheel-lock rifles to create sparks. It can also produce sulfuric acid drainage when exposed to air and water in mines.

Field identification & locations

Identify by its brittle nature, greenish-black streak (unlike gold's yellow streak), and cubic or pyritohedron crystal shapes. Found worldwide, notably in Spain, Peru, Italy, and the USA.