mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale. Color: Brass-yellow, pale gold. Luster: Metallic. Crystal structure: Isometric/cubic. Cleavage: Poor/indistinct. Specific gravity: ~5.0.

Hardness: 6-6
Color: Brass-yellow, pale gold
Luster: Metallic

Identified July 27, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale. Color: Brass-yellow, pale gold. Luster: Metallic. Crystal structure: Isometric/cubic. Cleavage: Poor/indistinct. Specific gravity: ~5.0.

Formation & geological history

Forms in igneous, metamorphic, and sedimentary environments through hydrothermal processes, magmatic segregation, or sedimentary deposition under reducing conditions.

Uses & applications

Historically used as a source of sulfur and iron ore, in radio receivers, and in firearms (wheel-lock ignition). Today used primarily in jewelry, decorative items, and mineral collecting.

Geological facts

Earned the nickname 'Fool's Gold' because its metallic brassy yellow color frequently deceived amateur prospectors during gold rushes. Sparks can be produced when struck against steel.

Field identification & locations

Identified by its brassy metallic luster, high density, cubic crystal habits, and dark greenish-black streak (unlike real gold, which leaves a yellow streak). Commonly found in Peru, Spain, Italy, and North America.