Grain size

diameter of individual grains of sediment, or of lithified particles in clastic rocks From Wikipedia, the free encyclopedia

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Particle size, also called grain size, means the diameter of individual grains of sediment, or the lithified particles in clastic rocks. The term may also be used for other granular materials.[1]

More information φ scale, Size range (metric) ...

In some schemes "gravel" is anything larger than sand (>2.0 mm), and includes "granule", "pebble", "cobble", and "boulder" in the above table. In this scheme, "pebble" covers the size range 4 to 64 mm (−2 to −6 φ).

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