mineral

Pyrite

Iron Sulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.8-5.0

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

Identified July 4, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in diverse environments including hydrothermal veins, sedimentary rocks, and contact metamorphic deposits. It is often found in association with other sulfides and oxides.

Uses & applications

Primarily used as a source of sulfur and iron. Historically used in firearms. Now popular in inexpensive jewelry and as a collector's mineral specimen.

Geological facts

Often called 'Fool's Gold' because its color and metallic luster frequently lead novice prospectors to mistake it for gold. However, pyrite is harder and more brittle.

Field identification & locations

Identify by its cubic or dodecahedral crystal habit, brassy color, and greenish-black streak when rubbed on a tile. Found worldwide, notably in Spain, Italy, and the USA.