sedimentary
Conglomerate
Conglomerate
AI-generated identification · may be incorrectHardness variable depending on clasts and matrix (typically 6-7 for quartz-rich), color is multicolored/gray with rounded pebble clasts, dull to earthy luster, clastic texture with rounded fragments greater than 2mm cemented together.
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 variable depending on clasts and matrix (typically 6-7 for quartz-rich), color is multicolored/gray with rounded pebble clasts, dull to earthy luster, clastic texture with rounded fragments greater than 2mm cemented together.
Formation & geological history
Formed by the consolidation and cementation of gravel-sized rounded clasts in high-energy environments such as fast-flowing rivers, alluvial fans, or beach zones.
Uses & applications
Used primarily as crushed stone for construction, road aggregate, and occasionally as a decorative building stone.
Geological facts
Conglomerates are often referred to colloquially as "puddingstone" when they feature contrasting rounded pebbles set in a fine-grained matrix.
Field identification & locations
Easily identified in the field by its distinct "natural concrete" appearance containing visibly rounded pebbles or cobbles embedded in a finer matrix.
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