Material consisting of fragmented particles of mostly siliceous rock, specifically as it appears on the surface of a beach or a desert. Individual particles may range in diameter from approximately 0.0008-0.08 inch. Most rock-forming minerals at the Earth's surface may be constituents of sand, but a limited number are common. Quartz is most common.
http://vocab.getty.edu/page/aat/300014341
Source: AAT
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