December 17
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Sand

The coarsest component of most soils, defined as having particles more than 0.5 mm but less than 2 mm in diameter (larger particles are classed as gravel). Sands are composed of hard minerals, in most cases predominantly quartz which is almost pure silica, extremely hard and virtually insoluble in water; but beach sands may also contain shell grit, which is similar to limestone.

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