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Sand sorting

Sand sorting

What's the difference between silt, sand, and gravel? Size. Silt is a naturally occurring granular material .004mm-.0625mm; sand grains are .0625mm-2mm; gravel is 2mm-64mm. Most sands are in the 1mm range. While most sands contain silica (SiO2), sand composition and its resulting color and texture varies widely, including white gypsum sands in New Mexico, black volcanic sands (from basalt and obsidian) in Greece, green olivine sands in Hawaii and Guam, and coral pink sands (from hematite) in Utah.

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geology, weather

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Last updated by curious on Sept. 26, 2009

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While the Library has verified the information presented in these files in what it considers to be reliable and authoritative sources, it cannot take responsibility for nor guarantee the accuracy of the information presented.