mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic/octahedral); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

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

Identified June 25, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic/octahedral); Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in hydrothermal veins, as an accessory mineral in igneous rocks, by contact metamorphism, and in sedimentary rocks such as shale and coal. It is found in geological environments ranging from thousands to millions of years old.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is primarily used in the manufacturing of glass and lithium batteries, and as a popular collector specimen/ornamental stone.

Geological facts

Commonly known as 'Fool's Gold' because its color and weight can lead novice prospectors to mistake it for real gold. It can spark when struck against steel, leading to its name derived from the Greek word 'pyr' meaning fire.

Field identification & locations

Identify by its hardness (harder than gold, which is soft), its greenish-black streak (gold has a yellow streak), and its brittle nature. It is common worldwide, including massive deposits in Spain, Italy, and Peru.