mineral

Pyrite (fool’s gold)

Pyrite, FeS₂

AI-generated identification · may be incorrect

Brassy gold color with strong metallic luster and granular, angular crystal faces; Mohs hardness 6–6.5, cubic crystal system, no true cleavage, and specific gravity about 5.0. The image is consistent with pyrite, though visual identification alone cannot rule out other sulfides.

Identified September 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms when iron and sulfur combine in hydrothermal veins, sedimentary rocks, and metamorphic settings; specimens may range from recent growth to billions of years old.

Uses & applications

Used historically as a source of sulfur and in research; attractive specimens are collected and occasionally used decoratively. It is not a practical gold ore in most deposits.

Geological facts

Its brassy color and metallic shine earned it the name “fool’s gold,” but pyrite is brittle and much harder than gold.

Field identification & locations

Look for a pale brass color, sharp brittle grains or cubic crystals, and a dark streak; gold is softer, malleable, and leaves a yellow streak. Common worldwide, including Spain, Peru, China, and the United States.