Beach and Shoreline Sands From Around the World
Beach and Shoreline Sands From Around the World. A geologist's definition would be that sand is unconsolidated sedimentary mineral material with a particle size between 1/16 mm and 2 mm. Silt and clay are progressively finer materials. Granules, pebbles, and boulders are progressively coarser particles that make up sediments called gravel.