mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified April 6, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in a 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. It forms under both high and low temperatures.

Uses & applications

Historically used as an ignition source (striking sparks) and a source of sulfur for sulfuric acid. Today, it is primarily used in the production of sulfur dioxide for the paper industry and as a popular collector's mineral and decorative stone.

Geological facts

Known as 'Fool's Gold' because its color and high specific gravity lead novice prospectors to mistake it for gold. However, pyrite is much harder than gold and brittle rather than malleable. It can actually contain trace amounts of real gold within its structure.

Field identification & locations

Identify in the field by its cubic crystal habit, brassy luster, and greenish-black streak. Unlike gold, it cannot be scratched by a copper penny or a knife, and it will shatter when struck rather than flattening. Commonly found worldwide, especially in Spain, Italy, and the USA.