Like every grain of sand
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Like every grain of sand

by Antonio Jordán, University of Seville, Sevilla, Spain

Sand is formed by mineral particles of size between 0.05 and 2 mm. The sand comes from the fragmentation of the rock, so it has its own chemical and mineral composition. The most common component is quartz. Other frequent minerals are orthoses, plagioclase, oscovite, biotite, hematite, goethite, calcite, chalcedony and gypsum.