Sand
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Sand by definition is a loose granular material that results from the disintegration of rocks, consists of particles smaller than gravel but coarser than silt.
The most commonly available gritty or coarse sand is builders sand because it's a common building material. It's used in concrete mixes and some mortar mixes. Builders sand is not the same thing as play sand or sandbox sand, which are made of finer, rounder grains, similar to beach sand.