mineral
Small metallic sulfide fragment, possibly pyrite-bearing ore
Likely pyrite (iron disulfide, FeS₂), though the image is insufficient for definitive identification
AI-generated identification · may be incorrectIrregular brown-gold, metallic-looking fragment with possible crystalline faces; pyrite hardness 6–6.5 Mohs, brassy yellow color, metallic luster, cubic crystal system, and no prominent cleavage. The apparent dark tarnish or attached matrix may indicate weathering.
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Physical properties
Irregular brown-gold, metallic-looking fragment with possible crystalline faces; pyrite hardness 6–6.5 Mohs, brassy yellow color, metallic luster, cubic crystal system, and no prominent cleavage. The apparent dark tarnish or attached matrix may indicate weathering.
Formation & geological history
Pyrite forms in hydrothermal veins and sedimentary rocks, including coal beds and shale, through sulfide mineral precipitation; specimens range from Precambrian to modern geological settings.
Uses & applications
Common pyrite has limited industrial value but is processed as a source of sulfur and sometimes recovered alongside gold or copper; attractive crystals are collected, but this tiny fragment has minimal commercial value.
Geological facts
Pyrite is nicknamed “fool’s gold,” but it is harder and typically more angular or crystalline than gold; its streak is greenish-black rather than gold-yellow.
Field identification & locations
Check for a greenish-black streak on unglazed porcelain, cubic crystal faces, and brittleness; gold is softer, malleable, and leaves a yellow streak. Common worldwide, especially in Peru, Spain, Italy, China, and the United States.
