soil particles with a size between 0.06 mm and 2.0 mm in diameter (contrast with clay and silt).

Merriam-Webster Online Dictionary
sand (noun)
a) a loose granular material that results from the disintegration of rocks, consists of particles smaller than gravel but coarser than silt, and is used in mortar, glass, abrasives, and foundry molds
b) soil containing 85 percent or more of sand and a maximum of 10 percent of clay , broadly soil - sandy
a) a tract of sand - beach
b) a or - sandbank sandbar
the sand in an hourglass , also the moments of a lifetime - usually used in plural the sands of this government run out very rapidly H. J. Laski
an oil-producing formation of or unconsolidated sand - sandstone
firm resolution
a yellowish-gray color
sand (verb)
transitive verb
to sprinkle or dust with or as if with sand
to cover or fill with sand
to smooth or dress by grinding or rubbing with an abrasive (as ) - sandpaper
Sand (biographical name)
George 1804–1876 pseud. of (or ) née Fr. writer - Amandine-Aurore-Lucie -Lucile Du*de*vant bixsan02.wav dᵫd-ˈväⁿ, dᵫ-də- Dupin
sand (Wikipedia)

Sand dunes in the Idehan Ubari, Libya.
Close-up (1×1 cm) of sand from the Gobi Desert, Mongolia.

Sand is a granular material composed of finely divided rock and mineral particles. It is defined by size, being finer than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass.

The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz. The second most common type of sand is calcium carbonate, for example, aragonite, which has mostly been created, over the past half billion years, by various forms of life, like coral and shellfish. For example, it is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years like the Caribbean.

Sand is a non-renewable resource over human timescales, and sand suitable for making concrete is in high demand. Desert sand, although plentiful, is not suitable for concrete. 50 billion tons of beach sand and fossil sand is used each year for construction.

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