mineral

Pyrite

Iron Sulfide (FeS2)

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

Formation & geological history

Formed in sedimentary, igneous, and metamorphic environments through hydrothermal activity, precipitation in reducing environments, and magmatic segregation.

Uses & applications

Used historically for ignition in firearms, currently used in the manufacture of sulfur dioxide and sulfuric acid, and popular among mineral collectors and in jewelry.

Geological facts

Commonly known as 'Fool's Gold' due to its metallic luster and pale brass-yellow hue, which has often deceived inexperienced prospectors.

Field identification & locations

Easily identified by its high specific gravity, brass-yellow color, metallic luster, and blackish green streak. Commonly found worldwide in association with other sulfides or oxides in coal beds, limestone, and quartz veins.