LIMESTONE physical PropertiesLimestone being a natural stone, there can be variation in color &shade.Water Absorption : The capacity of water absorption is not more than 1.0%Hardness : Lies between 6 to 7 on Moh's Scale Density 2.32 to 2.42 Kg/m3color : Sandstone is available in many colors – red, green, yellow, pink, gray and white.Porosity : The porosity of sandstone is almost negligible. Thus sandstone is almost impermeable.Limestone Chemical PropertiesLimestone is a sedimentary rock and is mainly made of calcite and aragonite, which are nothing but Calcium carbonate crystals. Limestone comprises approximately 10% of the total sedimentary rock population.