mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2

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

Identified July 10, 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; Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in a wide variety of geological settings including 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 used as a source of sulfur and sulfuric acid. Today it is used in the production of lithium batteries, as a gemstone in 'marcasite' jewelry, and as a popular collector specimen.

Geological facts

Commonly known as 'Fool's Gold' because its color and metallic luster often led prospectors to mistake it for real gold. Unlike gold, pyrite is brittle and yields a greenish-black streak when rubbed on a porcelain plate.

Field identification & locations

Identified in the field by its cubic crystal habit, brassy color, and high hardness (it can scratch glass, whereas gold cannot). It is found globally, with famous deposits in Spain, Italy, and the USA.