mineral
Pyrite (fool’s gold)
Pyrite, iron disulfide (FeS₂)
AI-generated identification · may be incorrectMetallic, brassy gray-gold and strongly reflective, with granular cubic-looking crystals. Mohs hardness 6–6.5; cubic crystal system; specific gravity about 5; no prominent cleavage. The image alone cannot confirm the identification.
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Physical properties
Metallic, brassy gray-gold and strongly reflective, with granular cubic-looking crystals. Mohs hardness 6–6.5; cubic crystal system; specific gravity about 5; no prominent cleavage. The image alone cannot confirm the identification.
Formation & geological history
Forms in sedimentary rocks, hydrothermal veins, and metamorphic settings when iron and sulfur combine under low-oxygen conditions. Pyrite occurs across geological ages, from ancient deposits to modern environments.
Uses & applications
Used as an iron-sulfide ore and historically for sulfur production; attractive specimens are collected, though pyrite is generally not used as a durable gemstone.
Geological facts
Its metallic sparkle earned it the nickname “fool’s gold,” but unlike gold it is brittle and can tarnish or oxidize.
Field identification & locations
Look for brassy metallic color, brittle fracture, and often cubic crystals; gold is softer, malleable, and leaves a yellow streak. Common worldwide in coal beds, sedimentary rocks, and hydrothermal deposits.
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