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It can, but it does not have to. A sandstone is a rock composed primarily of grains of sand that have been welded together by various lithologic processes, such as cementation. As the term is used by geologists, sand particles range in diameter from 0.0625 (or 1⁄16 mm, or 62.5 micrometers) to 2 millimeters. Often times by the time a particle of rock has been tumbled around to that size it has become rounded, but not always. For more info on sand, see the Wikipedia page: http://en.wikipedia.org/wiki/Sand

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16y ago

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