sandstone - a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)firestone - a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns holystone - a soft sandstone used for scrubbing the decks of a ship brownstone - a reddish brown sandstone; used in buildings bluestone - bluish-gray sandstone used for paving and building greensand - an olive-green sandstone containing glauconite siltstone - a fine-grained sandstone of consolidated silt |