page_title: Grain size
hierarchical_section_title: Grain size
caption_attribution_description: English: Beach cobbles at Nash Point, South Wales.
context_page_description: Grain size is the diameter of individual grains of sediment, or the lithified particles in clastic rocks. The term may also be applied to other granular materials. This is different from the crystallite size, which refers to the size of a single crystal inside a particle or grain. A single grain can be composed of several crystals. Granular material can range from very small colloidal particles, through clay, silt, sand, gravel, and cobbles, to boulders.
context_section_description: Grain size (or particle size) is the diameter of individual grains of sediment, or the lithified particles in clastic rocks.  The term may also be applied to other granular materials. This is different from the crystallite size, which refers to the size of a single crystal inside a particle or grain. A single grain can be composed of several crystals. Granular material can range from very small colloidal particles, through clay, silt, sand, gravel, and cobbles, to boulders.
caption: Beach cobbles at Nash Point, South Wales.
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