What physical characteristic are detrital rocks classified?

Detrital rocks are classified primarily based on the size and composition of their sediment grains. These rocks, which are formed from the accumulation of fragments derived from pre-existing rocks, can be categorized into different types such as sandstone, shale, and conglomerate, depending on whether the grains are coarse, medium, or fine. The mineral composition and sorting of the sediment also play a significant role in their classification.