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Sandstone is a sedimentary rock composed of sand-size grains of mineral, rock, or organic material. It also contains a cementing material that binds the sand grains together and may contain a matrix of silt- or clay-size particles that occupy the spaces between the sand grains. Mineral grains in sandstones are usually quartz. These are sands that have been worked and reworked by wind or water and are said to be "mature."
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