sedimentary
Tumbled Agate Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on Mohs scale, smooth polished luster, microcrystalline trigonal structure, cream and brown banded/mottled color pattern, conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on Mohs scale, smooth polished luster, microcrystalline trigonal structure, cream and brown banded/mottled color pattern, conchoidal fracture.
Formation & geological history
Formed as secondary deposits in rock cavities, often associated with volcanic rocks or sedimentary gravel beds where silica-rich fluids deposit layers over time.
Uses & applications
Popular for lapidary arts, decorative rock collections, pocket stones, and costume jewelry.
Geological facts
Agates are formed from microscopic crystals of quartz that grow in concentric layers. Smooth river-worn or machine-tumbled pebbles like this often reveal unique inner patterns.
Field identification & locations
Can be identified by its hardness (scratches glass), smooth waxy-to-vitreous feel, and characteristic opaque to translucent silicate patterning. Commonly found along riverbeds, beaches, and gravel deposits worldwide.
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