A brief overview of Limestone and Sandstone compositions Limestone Is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). Limestone is predominately quite light (cream) in colour but can range into biscuit and honeycomb colours Our Mount Gambier Limestone (fossiliferous limestone) is located and … Continue reading What’s the difference between Limestone and Sandstone?