mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on the Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.8-5.0.

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

Identified July 31, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on the Mohs scale. Color: Pale brass-yellow. Luster: Metallic. Crystal structure: Isometric (cubic). Cleavage: Indistinct. Specific gravity: 4.8-5.0.

Formation & geological history

Forms in a wide variety of geological environments, including hydrothermal veins, sedimentary rocks, and as a replacement mineral in fossils, often under reducing conditions.

Uses & applications

Historically used to strike fire, currently used in the manufacture of sulfur and sulfuric acid, and popular among mineral collectors and in jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to gold, pyrite derives its name from the Greek word pyr, meaning fire, because it emits sparks when struck against steel.

Field identification & locations

Easily identified in the field by its brassy yellow color, high specific gravity, metallic luster, and blackish green streak, along with its characteristic cubic crystal habit.