mineral

Pyrite

Iron Sulfide (FeS2)

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

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

Identified July 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in wide variety of geological settings including hydrothermal veins, sedimentary rocks (via biological sulfate reduction), and as an accessory mineral in igneous rocks. It can form in many geological ages from Precambrian to recent.

Uses & applications

Major source of sulfur for sulfuric acid production; formerly used as a source of iron. Popular in the jewelry industry (often marketed as marcasite) and as a collector's mineral.

Geological facts

Commonly known as Fool's Gold due to its resemblance to precious metals. It was used in early firearms like the wheel-lock to create sparks. It can occasionally contain trace amounts of real gold.

Field identification & locations

Identify by its 'cubic' crystal habit, metallic luster, and blackish-green streak on a streak plate (gold has a yellow streak). It is commonly found in Peru, Spain, Italy, and the USA.