mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Mohs hardness 6-6.5, brass-yellow to pale golden color, metallic luster, isometric/cubic crystal system, uneven to conchoidal fracture, specific gravity 4.9-5.2

Identified July 26, 2026More mineral →

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Physical properties

Mohs hardness 6-6.5, brass-yellow to pale golden color, metallic luster, isometric/cubic crystal system, uneven to conchoidal fracture, specific gravity 4.9-5.2

Formation & geological history

Forms in a wide variety of geological settings, including hydrothermally formed veins, metamorphic rocks, and sedimentary beds via sulfur reduction in anaerobic environments.

Uses & applications

Historically used to create sparks for firearms and sulfur production. Today, used in lithium batteries, paper production (sulfuric acid), and highly popular as a collector mineral specimen.

Geological facts

Often mistaken for real gold due to its metallic luster and brassy hue, leading to the nickname 'Fool's Gold'. Unlike gold, pyrite is much harder and brittle, leaving a greenish-black streak when scraped.

Field identification & locations

Identified by its high density, metallic brassy sheen, non-malleability, and dark greenish-black streak. Commonly found in USA, Peru, Spain, and Russia.