sentences:  Iron and aluminium oxides are found within laterite, which was formed by the weathering of Hawkesbury sandstone.Crushing strengths and fire resistance tests carried out on Sydney sandstone showed that the compressive strength was 2.57 tons per square inch, or 39.9 megapascals (MPa).The crushing strength for ashlar masonry and lintels averaged 4,600 pounds per square inch (31.7 MPa).