mineral

Pyrite

Iron Disulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (often cubic, octahedral, or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9–5.2

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

Identified March 12, 2026More mineral →

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Physical properties

Formation & geological history

Formed in a wide variety of geological environments: primarily through hydrothermal activity in veins, as an accessory mineral in igneous rocks, and by sedimentary precipitation in anaerobic (low oxygen) environments rich in organic matter.

Uses & applications

Historically used to produce sulfuric acid and sulfur. Today, it is primarily used as an ornamental stone, a collector's mineral, and in some types of batteries (lithium-pyrite). It is not usually mined for iron due to the difficulty of removing sulfur impurity.

Geological facts

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

Field identification & locations

Identify in the field by its brassy color, cubic crystal habit, and the 'sulfuric' smell it gives off when struck with a hammer. Found globally, with notable deposits in Spain (Rio Tinto), Italy, Peru, and various locations across the United States.