mineral

Likely pyrite (“fool’s gold”) fragment

Pyrite, FeS₂

AI-generated identification · may be incorrect

Brassy gold color with a metallic luster and irregular, rounded form; pyrite has Mohs hardness 6–6.5, an isometric crystal structure, and no prominent cleavage. The photo alone does not confirm the identification; other brassy minerals may look similar.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in many settings, including hydrothermal veins and sedimentary rocks, through reactions involving iron and sulfur. It occurs in rocks of many geological ages.

Uses & applications

Used as a source of sulfur and historically for sulfuric acid production; attractive crystal specimens are collected, though this small irregular piece has little jewelry value.

Geological facts

Pyrite can form cubes and striated crystal faces, unlike the typically softer, more malleable native gold.

Field identification & locations

Check for a metallic brassy color and brittle fracture; pyrite is much harder than gold and leaves a dark streak. Common worldwide, including in sedimentary deposits and mineral veins.