mineral
Pyrite (fool’s gold)
Pyrite, iron disulfide (FeS₂)
AI-generated identification · may be incorrectBrassy yellow metallic luster with granular, irregular crystals; Mohs hardness 6–6.5, cubic crystal system, no prominent cleavage, specific gravity about 5.0. The small specimen’s appearance is consistent with pyrite.
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Physical properties
Brassy yellow metallic luster with granular, irregular crystals; Mohs hardness 6–6.5, cubic crystal system, no prominent cleavage, specific gravity about 5.0. The small specimen’s appearance is consistent with pyrite.
Formation & geological history
Forms in sedimentary rocks, hydrothermal veins, and metamorphic settings when iron and sulfur react under low-oxygen conditions. Pyrite occurs in rocks of many geological ages.
Uses & applications
Used historically as a source of sulfur and in collectible specimens; attractive crystals are sometimes used in jewelry, though they can tarnish and are brittle.
Geological facts
Its metallic color resembles gold, but pyrite is harder and brittle; striking it can produce sparks. Pyrite oxidation can generate acidic drainage and damage specimens.
Field identification & locations
Look for a brassy color, metallic shine, and brittle fracture rather than gold’s softness and malleability. It is widespread worldwide, including in sedimentary deposits and hydrothermal veins.
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Mineral