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1.4 - Sedimentary Rocks. Sedimentary rocks are formed via the breakdown and redeposition of other materials, often older rocks. Sedimentary rocks are classified by their dominant particle size (sand, silt, or clay) and their mineral composition.lassic sedimentary rocks (i.e., sandstone or shale) are composed of minerals, grains and rock fragments derived from older rocks; while biogenic sedimentary rocks are made up of shells, their recrystallized remnants (i.e., limestone) or plant fragments (i.e., coal).
Igneous rock that forms when magma cools below the Earth's surface. It is coarse-grained because the magma cools very slowly. Sedimentary rock that is made of fragments of rocks that have been cemented together by a mineral. Sedimentary rock that is made from solutions of dissolved minerals in water.