The term 'SANDY MATERIAL' can be summarized by the crossword solution GRIT, which is a four-letter word. GRIT is a loose accumulation of rock or mineral fragments, usually quartz and feldspar, found on beaches and in other sedimentary environments. It is also used to describe the texture of a surface, such as a road or path, that has been covered with a layer of small stones. GRIT is an important component of many construction projects, as it provides traction and stability.