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Texture is how we describe the grain and particle sizes in a soil. Soil particles are grouped into what are called, soil separates. The three soil separates are sand, silt, and clay. Sand is a loose, gritty substance. It is the largest of the three particle sizes. Silt particles are much smaller than sand and form a smooth, fine substance. Clay is made up of microscopic particles that pack tightly together to form a sticky, cohesive substance.