mineral
Polished eye agate
Quartz (SiO₂), commonly chalcedony with concentric fortification bands
AI-generated identification · may be incorrectFine-grained, cryptocrystalline quartz; typically hardness 6.5–7, waxy to vitreous luster, and no visible cleavage. The specimen shows gray-green and cream concentric bands with orbicular “eyes”; the image alone cannot confirm its exact mineral colors or treatment.
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Physical properties
Fine-grained, cryptocrystalline quartz; typically hardness 6.5–7, waxy to vitreous luster, and no visible cleavage. The specimen shows gray-green and cream concentric bands with orbicular “eyes”; the image alone cannot confirm its exact mineral colors or treatment.
Formation & geological history
Agate forms as silica-rich fluids deposit successive layers in cavities, often in volcanic rock. Its age depends on the host formation and cannot be determined from the photograph.
Uses & applications
Used for lapidary jewelry, cabochons, carvings, and collecting; agate also has minor ornamental and historical uses.
Geological facts
Eye patterns arise from rounded, concentric layers of chalcedony and may resemble small targets.
Field identification & locations
Look for hard, smooth chalcedony with nested curved bands; common sources include Brazil, Uruguay, India, and the western United States. This appears cut or polished, though the rough edges remain.
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