mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic, gleaming; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.8-5.0

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

Identified August 6, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic, gleaming; Crystal Structure: Isometric; Cleavage: Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in a wide variety of geological conditions, including hydrothermal veins, sedimentary rocks, and metamorphic rocks, often associated with other sulfides or oxides in coal beds and fossilized wood.

Uses & applications

Historically used to strike fire, currently used in the manufacture of sulfur and sulfuric acid, and widely collected as a mineral specimen and used in jewelry.

Geological facts

Commonly known as 'Fool's Gold' because of its metallic luster and pale brass-yellow hue, which has often deceived inexperienced prospectors into thinking it was actual gold.

Field identification & locations

Identified by its brassy yellow color, high specific gravity, dark streak, and cubic or clustered crystalline forms. Found worldwide with notable deposits in Spain, Peru, and the United States.