mineral
Pyrite (likely)
Pyrite, FeS₂
AI-generated identification · may be incorrectThe small metallic, brassy-gold crystal cluster is consistent with pyrite. Hardness 6–6.5 Mohs; opaque, metallic luster, cubic crystal system, and no prominent cleavage; the image is too small to confirm diagnostic details.
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Physical properties
The small metallic, brassy-gold crystal cluster is consistent with pyrite. Hardness 6–6.5 Mohs; opaque, metallic luster, cubic crystal system, and no prominent cleavage; the image is too small to confirm diagnostic details.
Formation & geological history
Pyrite forms in many settings, including sedimentary rocks, hydrothermal veins, and metamorphic deposits, by crystallization or chemical precipitation. Its age depends on the host rock and cannot be determined from the image.
Uses & applications
Used as a source of sulfur historically and collected as a common display mineral; it is not typically used as an iron ore today.
Geological facts
Nicknamed “fool’s gold,” pyrite is harder and more brittle than gold and commonly forms cubic crystals.
Field identification & locations
Look for brassy metallic color, sharp crystal faces, and a dark streak; gold is softer and malleable. Found worldwide, often in sedimentary rocks and mineral veins.
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