mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal System: Isometric (cubic, pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2; Streak: Greenish-black to brownish-black.

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

Identified July 4, 2026More mineral →

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Physical properties

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 like shale and coal.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is primarily used in the production of lithium batteries, as a flux in the steel industry, and as a popular specimen for collectors and jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its metallic luster and brassy hue which often lead inexperienced prospectors to mistake it for real gold. It is the most common sulfide mineral on Earth.

Field identification & locations

Identify in the field by its cubic crystal habit, high hardness (it can scratch glass, whereas gold cannot), and its greenish-black streak. It is often found associated with quartz and other sulfides. Found globally, with notable deposits in Spain, Peru, and the USA.