Detrital sedimentary rocks are classified according to clastic particle size; chemical sedimentary rocks are named according to their mineral composition.

Question

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Detrital (or clastic) sedimentary rocks are indeed classified based on the size of the particles they contain, such as sandstone (made of sand-sized particles) or shale (made of very fine particles). Chemical sedimentary rocks, on the other hand, are classified according to their dominant mineral composition, such as limestone, which is primarily composed of calcite.

Detrital Sedimentary Rocks Are Classified According to Clastic Particle Size;