SANDSTONE RETAINING WALLS NORTHERN BEACHES OPTIONS

Sydney sandstone – Medium to coarse-grained quartz sandstone with minor shale and laminite lenses.Sandstone is actually a sedimentary rock composed of sand-sized minerals or rock grains. Most sandstone is composed of quartz and/or feldspar, One of the more frequent minerals from the Earth's crust and calcite, gypsum or a variety of iron compound