sedimentary
Tumbled Agate Pebble
Silicon Dioxide (SiO2)
Hardness of 6.5-7 on Mohs scale, smooth polished luster, microcrystalline trigonal structure, cream and brown banded/mottled color pattern, conchoidal fracture.
Identified More sedimentary →
Explore Tumbled Agate Pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
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.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale
Sedimentary Shale
sedimentary