sedimentary
Conglomerate
Clastic Sedimentary Rock
AI-generated identification · may be incorrectHardness varies by matrix and clasts (typically Mohs 6-7 for quartz pebbles), multicolored with rounded to sub-rounded clasts, dull to vitreous luster, clastic texture.
Identified More sedimentary →
Explore Conglomerate in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness varies by matrix and clasts (typically Mohs 6-7 for quartz pebbles), multicolored with rounded to sub-rounded clasts, dull to vitreous luster, clastic texture.
Formation & geological history
Formed by the consolidation and cementation of gravel-sized rounded clasts, such as pebbles and cobbles, in high-energy environments like rivers or beaches.
Uses & applications
Used locally as crushed stone for construction, road gravel, and sometimes as decorative architectural stone.
Geological facts
Often referred to as 'concrete created by nature' due to its natural cement binding distinct pebbles together.
Field identification & locations
Identified by visible, rounded pebbles cemented within a finer-grained matrix; commonly found in ancient alluvial fans and riverbeds.
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