Conglomerate rock is a type of sedimentary rock. It composed of large, rounded rock fragments contained within a smaller grained matrix of sediments. The large fragments, known as clasts, can come in a range of sizes, but all must be greater than two milimeters in diameter in order for the rock to be classified as a conglomerate.
Uses for Conglomerate
Though interesting to look at, conglomerate is not the world's most useful rock type. It lacks the glamour of granite or the strength of slate. But it does do one thing very well - being itself. Remember how much it looks like a concrete aggregate driveway? Well, conglomerate can actually be used in the making of concrete.