mineral
Metallic sulfide mineral specimen, likely pyrite-bearing ore
Likely pyrite (FeS₂), possibly mixed with other sulfides or host rock
AI-generated identification · may be incorrectDark gray to brassy metallic luster with granular/crystalline faces; pyrite hardness 6–6.5 Mohs, cubic crystal system, poor cleavage, and specific gravity about 5.0. The image is insufficient to confirm composition or distinguish pyrite from marcasite, chalcopyrite, or sulfide-rich ore.
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Physical properties
Dark gray to brassy metallic luster with granular/crystalline faces; pyrite hardness 6–6.5 Mohs, cubic crystal system, poor cleavage, and specific gravity about 5.0. The image is insufficient to confirm composition or distinguish pyrite from marcasite, chalcopyrite, or sulfide-rich ore.
Formation & geological history
Sulfide minerals commonly form in hydrothermal veins, sedimentary exhalative deposits, and igneous-related ore bodies, from ancient Precambrian rocks to geologically recent systems. Pyrite forms when iron and sulfur combine under low-oxygen conditions.
Uses & applications
Pyrite is collected, historically used as a sulfur source, and sometimes processed for sulfuric acid or metal recovery; it has limited jewelry use. Ore-grade material may contain valuable copper, zinc, lead, silver, or gold.
Geological facts
Its metallic appearance can resemble gold, but pyrite is harder and less malleable. A streak test, hardness test, and ideally chemical or X-ray analysis are needed for reliable identification.
Field identification & locations
Look for brassy color, cubic forms, metallic luster, and a greenish-black to brownish-black streak; avoid destructive tests on valuable specimens. Common localities include Spain, Peru, Italy, China, and hydrothermal ore districts worldwide.
