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Particles in siliciclastic sediment that range in size from 0.0625 millimeters (very fine-grained sand) to 2.0 millimeters (very coarse-grained sand), according to the Udden-Wentworth scale. In field geology, to tell the difference between fine-grained sand and coarse silt, the particle in a rock is "sand" if it can be clearly seen with the naked eye.

Selected sand links:

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