Conglomerate is distinguished from breccia by its rounded clasts.

Rock group	Sedimentary
Origin	Clastic/detrital
Particle size (Wentworth)	>2 mm

Conglomerate in Hand Sample

Your friendly author really likes conglomerates and has sole editorial control, mwahahaha, so here’s a load of conglomerates.

Leesburg Conglomerate boulder
Flat pebble conglomerate of the Gros Ventre Formation
Quartz pebble conglomerate of the Shawangunk Formation
Conglomerate of the Cerro Toro Formation, Chilean Patagonia
Mudchip conglomerate of the Belt Supergroup in Montana
Arkosic conglomerate from the Caves of Cushendun
Strained metaconglomerate known as Funzie conglomerate (with bonus structural geology content)
Just a nice conglomerate countertop

Conglomerate in Thin Section

Conglomerate with hematite cement, plane polars
Conglomerate with hematite cement, crossed polars
Conglomerate with hematite cement and calcite cement, plane polars
Conglomerate with hematite cement and calcite cement, crossed polars