mineral

Pyrite (Fool's Gold)

Iron Pyrite (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 on Mohs scale; Color: Brass-yellow to pale metallic gold; Luster: Metallic; Crystal Structure: Isometric/cubic or pyritohedral; Specific Gravity: 4.95-5.10; Cleavage: Poor/indistinct

Hardness: 6-6
Color: Brass-yellow to pale metallic gold
Luster: Metallic

Identified July 28, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Brass-yellow to pale metallic gold; Luster: Metallic; Crystal Structure: Isometric/cubic or pyritohedral; Specific Gravity: 4.95-5.10; Cleavage: Poor/indistinct

Formation & geological history

Forms in a wide variety of geological settings, including hydrothermal veins, sedimentary rocks, metamorphic rocks, and magmatic deposits through sulfide crystallization.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today it is used in lithium batteries, paper production, and widely collected as a decorative mineral specimen.

Geological facts

Pyrite gets its name from the Greek word 'pyr' meaning fire, because it emits sparks when struck against steel. It is famously known as Fool's Gold due to its resemblance to real gold.

Field identification & locations

Identified by its brassy metallic glitter, cubic crystal growth habits, high density, and brittle nature (unlike real gold which is malleable). Commonly found worldwide, including USA, Peru, Spain, and Italy.