mineral
Likely pyrite-rich nodule
Pyrite (FeS₂), possibly in a sedimentary concretion; identification from the image is uncertain
AI-generated identification · may be incorrectBrassy gray-gold metallic surface with uneven, weathered texture; pyrite has Mohs hardness 6–6.5 and an isometric crystal structure, but no distinct crystals are visible here.
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Physical properties
Brassy gray-gold metallic surface with uneven, weathered texture; pyrite has Mohs hardness 6–6.5 and an isometric crystal structure, but no distinct crystals are visible here.
Formation & geological history
Pyrite can precipitate in sedimentary rocks under oxygen-poor conditions and form nodules or concretions. Its age depends on the host rock and cannot be determined from the image.
Uses & applications
Collected as a mineral specimen; pyrite is also an important historical source of sulfur and has been used to produce sulfuric acid.
Geological facts
Pyrite is commonly called “fool’s gold,” though this specimen’s dull, irregular appearance is not diagnostic by itself.
Field identification & locations
A metallic luster and brassy color may suggest pyrite, but confirm with tests: pyrite is hard, leaves a dark streak, and is not strongly magnetic. Common in sedimentary rocks and hydrothermal veins worldwide.
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