mineral
Pyrite (fool’s gold)
Pyrite, FeS₂ (iron disulfide)
AI-generated identification · may be incorrectBrassy metallic luster with a granular, sparkly surface; Mohs hardness 6–6.5, specific gravity about 5.0. Pyrite crystallizes in the cubic system, though this specimen’s crystal faces are not clearly visible.
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Physical properties
Brassy metallic luster with a granular, sparkly surface; Mohs hardness 6–6.5, specific gravity about 5.0. Pyrite crystallizes in the cubic system, though this specimen’s crystal faces are not clearly visible.
Formation & geological history
Forms in many settings, including hydrothermal veins, sedimentary rocks, and metamorphic rocks; its age depends on the host deposit. The image does not reveal its geological context.
Uses & applications
Used as a collector specimen and historically as a source of sulfur for sulfuric acid; rarely used as an iron ore because of its sulfur content.
Geological facts
Its metallic appearance resembles gold, but pyrite is harder and more brittle. The specimen appears to be a small, rough pyrite-rich cluster.
Field identification & locations
Identify by its brass-yellow color, metallic sparkle, and brittle breakage; common worldwide, including in sedimentary deposits and hydrothermal veins. A photo alone cannot confirm the identification.
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