mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic/pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

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

Identified May 28, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric (cubic/pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Formed in diverse environments including hydrothermal veins, sedimentary rocks through biological activity, and as an accessory mineral in igneous rocks. Found in all geologic ages.

Uses & applications

Historically used to create sparks for firearms (wheel-locks); currently used in the production of sulfur dioxide for sulfuric acid, and as a popular collector's mineral and costume jewelry stone.

Geological facts

Often called 'Fool's Gold' because its color and weight misled early prospectors, though it is harder and more brittle than real gold. It is the most common sulfide mineral.

Field identification & locations

Identify in the field by its metallic luster, greenish-black streak, and brittle tenacity. Commonly found in Spain, Peru, Italy, and the USA (notably Colorado and Arizona).