mineral
Pyrite-bearing sulfide ore
Pyrite (FeS₂), possibly mixed with chalcopyrite and/or other sulfides
AI-generated identification · may be incorrectBrassy metallic-gray, granular to massive, with a sparkly metallic luster; pyrite hardness is 6–6.5 Mohs, cubic crystal structure, poor cleavage, and specific gravity about 5.0. The irregular hand specimen lacks diagnostic crystal faces, so exact identification from the image is uncertain.
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Physical properties
Brassy metallic-gray, granular to massive, with a sparkly metallic luster; pyrite hardness is 6–6.5 Mohs, cubic crystal structure, poor cleavage, and specific gravity about 5.0. The irregular hand specimen lacks diagnostic crystal faces, so exact identification from the image is uncertain.
Formation & geological history
Forms in hydrothermal veins, sedimentary rocks, and metamorphic environments when sulfur-rich fluids react with iron; deposits range from ancient Precambrian ores to geologically young systems.
Uses & applications
Sulfur and iron ore historically, with limited modern industrial use; attractive pieces are collected, but ordinary ore has little jewelry value.
Geological facts
Often called “fool’s gold,” pyrite is harder and more brittle than gold and commonly tarnishes or produces sulfuric acid through oxidation.
Field identification & locations
Identify by metallic brass color, high density, brittleness, and dark streak; a streak test, hardness test, and chemical or X-ray analysis are more reliable than appearance alone. Common worldwide, especially in Spain, Peru, China, Italy, and hydrothermal ore districts.
