mineral

Pyrite

Iron Sulfide (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 June 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 diverse environments including magmatic segregation, hydrothermal veins, and as a precipitate in sedimentary rocks. Found throughout various geological ages in anaerobic conditions.

Uses & applications

Historically used for the production of sulfuric acid and iron sulfate. Today, it is primarily used for jewelry (as marcasite), in radio receivers, and as a popular collector specimen.

Geological facts

Widely known as 'Fool's Gold' due to its resemblance to precious metals. During the Gold Rush, it was frequently mistaken for real gold, though it is much harder and more brittle. It can create sparks when struck against steel.

Field identification & locations

Identify by its hardness (will not scratch with a copper penny unlike gold), its greenish-black streak on porcelain, and its brittle fracture. Commonly found in quartz veins and coal beds globally.