mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified June 28, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in diverse geological environments including sedimentary rocks (through anaerobic bacteria), metamorphic rocks, and hydrothermal veins. It can range from Precambrian age to modern formations.

Uses & applications

Historical source of sulfur and sulfuric acid. Today used in jewelry (as marcasite), in solar panels as a semiconductor material, and as a popular collector's mineral.

Geological facts

Commonly known as 'Fool's Gold' because its color and weight can lead novice prospectors to mistake it for real gold. Unlike gold, pyrite is brittle and leaves a greenish-black streak.

Field identification & locations

Identify in the field by its metallic brass color and cubic crystal habit. Found globally with major deposits in Spain and Peru. Collectors look for sharp, mirror-like crystal faces.