sedimentary
Tumbled Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, colors vary widely including grey, white, brown, and blue, waxy to vitreous luster, microcrystalline quartz structure with conchoidal fracture.
Identified More sedimentary →
Explore Tumbled Agate in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors vary widely including grey, white, brown, and blue, waxy to vitreous luster, microcrystalline quartz structure with conchoidal fracture.
Formation & geological history
Formed in cavities of ancient volcanic and metamorphic rocks through the deposition of silica from groundwater circulating over millions of years.
Uses & applications
Commonly used in ornamental jewelry, tumbled stones for collection, decorative items, and lapidary art.
Geological facts
Agate is a variety of chalcedony. The name comes from the Achates River in Sicily, where stones were found in ancient times.
Field identification & locations
Easily identified by its hardness, smooth polished texture when tumbled, and faint banding patterns visible under light. Found worldwide.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary