sedimentary
Agate Nodule
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy luster, and cryptocrystalline structure with concentric banding in various colors.
Identified More sedimentary →
Explore Agate Nodule 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 luster, and cryptocrystalline structure with concentric banding in various colors.
Formation & geological history
Formed through the deposition of silica-rich groundwater inside cavities of ancient volcanic or sedimentary rocks over millions of years.
Uses & applications
Widely used in ornamental carvings, jewelry making, and as a popular specimen for mineral collectors.
Geological facts
Agate is a microcrystalline variety of quartz and often forms within gas cavities left by cooling volcanic lava.
Field identification & locations
Identified by its distinctive waxy luster, conchoidal fracture, and colorful concentric banding; commonly found in riverbeds and volcanic regions worldwide.
More like this
Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary