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The granulation describes the classification of grains and particles according to their grain size. The grain sizes are divided into the following groups (from large to small): stones, gravel, sand, silt and clay. The science of determining, describing and interpreting the grain size is called granulometry.
The term describes the grouping of particles of a certain grain size. There is no internationally valid definition. In German-speaking countries, for example, there are the fraction groups fine soil, fine skeleton and coarse skeleton, which in turn are subdivided into main fractions (e.g., clay, silt, sand, gravel).