sand made of soft rock used in concrete
sand made of soft rock used in concrete,Sand, Gravel, and Crushed Stone - the Kansas Geological SurveyThe average American uses more than a million pounds of cement, sand, gravel, and . Lightweight aggregate is manufactured from shale, a soft rock composed.sand made of soft rock used in concrete,sand made of soft rock used in concrete,Rogers Group, Inc. | Crushed Stone | Sand & Gravel | Asphalt .Calcite is used to make cement and lime for mortar in buildings. . Marble is quite soft and is easy to cut, carve and polish. .. Sandstone is a sedimentary rock composed largely of sand grains, mostly quartz worn down by wind, water and ice,.