sedimentary
Agate Geode
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, multicolored concentric bands, and trigonal crystal structure with conchoidal fracture.
Identified More sedimentary →
Explore Agate Geode in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 7 on the Mohs scale, waxy luster, multicolored concentric bands, and trigonal crystal structure with conchoidal fracture.
Formation & geological history
Formed through the deposition of silica-rich groundwater inside cavities of volcanic or sedimentary rocks over millions of years.
Uses & applications
Widely used in ornamental carvings, jewelry, lapidary art, and cherished by mineral collectors.
Geological facts
Geodes form when mineral-rich fluids seep into a hollow cavity and slowly crystallize inward, often leaving a hollow center lined with quartz crystals.
Field identification & locations
Easily identified by its distinctive outer nodular crust and interior concentric banding; commonly found in 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