Hard sand is a type of sedimentary material composed of small particles of rock and mineral fragments. It is usually found in coastal areas, deserts, and other areas where wind and water have eroded rocks over time. The term 'hard sand' is often used to describe the texture of the sand, which is coarse and gritty. The crossword solution for the term 'hard sand' is GRIT, which is an appropriate description of the texture of this type of sand.