Grain size

(geology) Average size of mineral particles composing a rock or sediment.
(graphic arts) Average size of silver halide grains in a photosensitive material.
(metallurgy) Average size of grains in a metal expressed as average diameter, or grains per unit area or volume.

A measure of the size of mineral particles of soil or rock; a physical characteristic of the particles of a soil which affects its mechanical properties; used in classification and identification.

Grain size may refer to:

• Particle size, size of rocks
• Crystallite size, the size of crystallites inside a material

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