sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
AI-generated identification · may be incorrectHardness varies by composition (typically Mohs 6-7 due to quartz pebbles), multicolored matrix with rounded clasts, dull luster, clastic texture with visible pebbles/cobbles.
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 composition (typically Mohs 6-7 due to quartz pebbles), multicolored matrix with rounded clasts, dull luster, clastic texture with visible pebbles/cobbles.
Formation & geological history
Formed from the consolidation and cementation of gravel-sized rounded fragments, deposited in high-energy environments like rivers or beaches.
Uses & applications
Used primarily as crushed stone for construction, road aggregate, and occasionally in decorative masonry.
Geological facts
The rounded shape of the clasts indicates that they were transported a significant distance by water or ice, tumbling against each other and wearing down sharp edges before being cemented together.
Field identification & locations
Easily identified by its distinct 'plum-pudding' appearance of rounded pebbles embedded in a finer-grained matrix. Found worldwide in sedimentary basins and ancient riverbeds.
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