mineral
Likely pyrite-bearing rock
Pyrite (FeS₂), possibly in a quartz- or iron-oxide-rich matrix
AI-generated identification · may be incorrectSmall, rough brown-gray specimen with brassy, reflective patches; pyrite has metallic luster, cubic crystals, Mohs hardness 6–6.5, and specific gravity about 5.0. The image is not clear enough to confirm the mineral or matrix.
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Physical properties
Small, rough brown-gray specimen with brassy, reflective patches; pyrite has metallic luster, cubic crystals, Mohs hardness 6–6.5, and specific gravity about 5.0. The image is not clear enough to confirm the mineral or matrix.
Formation & geological history
Pyrite commonly forms when iron and sulfur combine in sedimentary rocks, hydrothermal veins, and metamorphic settings; specimens can range from ancient to geologically recent.
Uses & applications
Pyrite is collected and studied; historically it has been used as a source of sulfur and iron, but this small specimen has little practical industrial value.
Geological facts
Pyrite is called “fool’s gold,” though its metallic luster and frequent cubic forms distinguish it from gold.
Field identification & locations
Look for a brassy color and hard, brittle crystals; gold is softer and malleable. Pyrite occurs worldwide, including in sedimentary deposits and hydrothermal veins.
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