sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and typically exhibits distinct banded patterns or concentric rings formed in cavities.
Identified More sedimentary →
Explore 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, waxy to vitreous luster, conchoidal fracture, and typically exhibits distinct banded patterns or concentric rings formed in cavities.
Formation & geological history
Formed through the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks, often over millions of years.
Uses & applications
Commonly used in jewelry, ornamental carvings, polished display specimens, and industrial knife-edge bearings due to its durability.
Geological facts
Agates were highly prized in the ancient world for use in signet rings and ornamental vessels, and they are frequently found in volcanic regions and riverbeds worldwide.
Field identification & locations
Can be identified in the field by its waxy luster, concentric banding or colorful translucency, and hardness that easily scratches glass.
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