HENDRIK SAND VAN HEERDEN

Sand is a granular material composed of finely divided rock and mineral particles. It is defined by size, being finer than gravel and coarser than silt. Sand is a non-renewable resource over human timescales and sand suitable for making concrete is in high demand. A stone is a piece of rock. It is a mass of hard, compacted mineral. The word stone also refers to natural rock as a material especially a building material. Natural stone used as building material include granite, marble and sandstone.