mineral
Likely pyrite (“fool’s gold”) fragment
Pyrite, FeS₂
AI-generated identification · may be incorrectBrassy 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.
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Physical properties
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.
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.
