sedimentary

Conglomerate

Sedimentary conglomerate

Hardness 6-7 (due to quartz pebbles), multicolored matrix, dull to earthy luster, clastic crystal structure, specific gravity 2.5-2.7.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness 6-7 (due to quartz pebbles), multicolored matrix, dull to earthy luster, clastic crystal structure, specific gravity 2.5-2.7.

Formed by the consolidation of rounded gravel and boulder-sized clasts in high-energy environments like rivers or beaches.

Used primarily in construction, road aggregate, and architectural stone.

Conglomerates provide direct evidence of ancient water flow direction and velocity based on clast orientation and rounding.

Identified by visible rounded pebbles cemented together in a finer-grained matrix. Found worldwide in sedimentary basins.

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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Shale

Fissile Sedimentary Rock

Sandstone

Arenite

Shale

Clastic sedimentary rock