mineral

Pyrite (Fools Gold)

Iron Disulfide (FeS2)

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.9-5.2

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

Identified July 9, 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: 4.9-5.2

Formation & geological history

Formed in hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks such as shale and coal.

Uses & applications

Historically a source of sulfur and sulfuric acid. Today used in jewelry (marcasite jewelry), as a detector mineral in radio receivers, and for educational specimens.

Geological facts

Pyrite is nicknamed 'Fools Gold' because its color and metallic luster often led prospectors to mistake it for real gold. It can actually contain trace amounts of gold within its structure.

Field identification & locations

Identify by its brassy color, high density, and brittle nature (gold is soft and malleable). It produces sparks when struck against steel. Found globally with major deposits in Spain, Peru, and the USA.