sedimentary
Banded Agate Pebble
Chalcedony (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, exhibits distinct concentric banding in earthy tones of white, beige, and reddish-brown, waxy to vitreous luster, microcrystalline (cryptocrystalline) quartz structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, exhibits distinct concentric banding in earthy tones of white, beige, and reddish-brown, waxy to vitreous luster, microcrystalline (cryptocrystalline) quartz structure.
Formation & geological history
Formed by the deposition of silica-rich groundwater solutions in cavities of ancient volcanic or sedimentary rocks over millions of years, often shaped into a smooth pebble by water tumbling in rivers or beaches.
Uses & applications
Used in lapidary arts, decorative items, jewelry making, and collected by rockhounds.
Geological facts
Agate has been used since ancient times (such as by the ancient Greeks and Babylonians) for seals, signet rings, and ornamental carvings.
Field identification & locations
Easily identified by its smooth, water-worn exterior and characteristic curved or concentric bands when viewed closely or slightly translucent edges. Commonly found in riverbeds, gravel deposits, and coastal areas worldwide.
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