mineral
Pyrite (fool’s gold)
Pyrite, FeS₂
AI-generated identification · may be incorrectBrassy yellow with metallic luster and granular, sparkling crystals; Mohs hardness 6–6.5, isometric crystal structure, and no prominent cleavage. The specimen appears to be a small rough pyrite-rich piece; image alone cannot confirm purity or distinguish all lookalikes.
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Physical properties
Brassy yellow with metallic luster and granular, sparkling crystals; Mohs hardness 6–6.5, isometric crystal structure, and no prominent cleavage. The specimen appears to be a small rough pyrite-rich piece; image alone cannot confirm purity or distinguish all lookalikes.
Formation & geological history
Pyrite forms in many geological settings, including hydrothermal veins and sedimentary rocks; it precipitates from iron- and sulfur-bearing fluids or forms during sediment alteration. Its age depends on the host deposit.
Uses & applications
Used as a source of sulfur and historically for sulfuric-acid production; attractive specimens are collected and sometimes used in jewelry or décor.
Geological facts
Its metallic appearance earned it the nickname “fool’s gold,” but pyrite is harder and more brittle than gold and commonly forms sharp crystals.
Field identification & locations
Look for a brassy color, metallic sparkle, and brittle fracture; unlike gold, pyrite often leaves a dark streak. Common worldwide in veins and sedimentary deposits.
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