Feb 15, 2017 Feb 15, 2017 Silica sand south africa durban . Silica sand south africa durban spec silica home. silica is a combination of silicon and oxygen, the second most abundant element in the earths crust. it is a hard, chemically inert product, with a high melting point and strong bond between atoms. spec sands cc aims at becoming the supplier of choice for silica sand in south africa and