Grain-shape and surface-texture analyses were conducted on fine quartz sand grains from North Padre Island and the South Texas eolian sand sheet. The purpose was to determine the effects of eolian shape sorting and abrasion upon the shapes of eolian sand grains. Two conclusions are reached. The first is that the wind preferentially transports spherical, rounded sand grains, and this can result in the isolation and accumulation of such grains in an eolian deposit after a relatively short transport distance. The second is that eolian abrasion can greatly increase the roundness of sand grains during their transport over a distance of less than 160 km. Abrasion does not, however, produce any regular downwind change in sand-grain sphericity.