mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified June 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in diverse environments including hydrothermal veins, sedimentary rocks (as concretions), and as an accessory mineral in igneous rocks. It can form at high or low temperatures throughout geological history.

Uses & applications

Historically used as a source of sulfur and for making sulfuric acid. Today it is used in the production of lithium batteries, as a semiconductor material, and as a popular specimen for collectors.

Geological facts

Commonly known as 'Fool's Gold' due to its superficial resemblance to real gold. It can be distinguished from gold because it is much harder and brittle, whereas gold is soft and malleable. It can also create sparks when struck against steel.

Field identification & locations

Identify by its brassy color, metallic luster, and blackish-green streak. Commonly found worldwide, especially in Peru, Spain, and Italy. In the field, look for its characteristic cubic or pyritohedral crystal shapes.