According to Colorado State University Extension, soil texture is defined by the size of the particles that make up the soil. Soil texture typically is categorized into three types: sand, silt and clayey.
Sand has larger particles and feels gritty. This course-textured soil is comprised of sand particles between medium- and coarse-sized particles. Clayey or fine textured soil has clay particles that are also the smallest particles of the three types, and the physical properties of soil containing clay makes the soil gummy and sticky. Silt has moderate-sized particles and a smooth, flour-like texture. Loam soil consists of clay, silt and sand sized particles. Soil texture can also be identified by feel; clay is sticky, silt is smooth and sand is gritty.