sedimentary
Eye Agate
Chalcedony (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, concentric ring patterns resembling an eye, waxy to vitreous luster, cryptocrystalline structure, no distinct cleavage, specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, concentric ring patterns resembling an eye, waxy to vitreous luster, cryptocrystalline structure, no distinct cleavage, specific gravity of 2.60 to 2.65.
Formation & geological history
Formed within cavities of volcanic or sedimentary rocks through the deposition of silica-rich groundwater solutions over millions of years.
Uses & applications
Used in ornamental carvings, tumbling, jewelry making, and collector displays.
Geological facts
Eye agates have historically been used as protective talismans and amulets across various ancient cultures due to their uncanny resemblance to eyes.
Field identification & locations
Easily identified by its concentric circular banding patterns with a central 'pupil' spot. Commonly found in riverbeds, glacial tills, and volcanic regions worldwide.
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