The
chemical constitution of sandstone is the same as that of sand, the rock is
thus composed essentially of quartz. The natural cementing material that
binds the sand together as rock is usually composed of silica, calcium
carbonate, or iron oxide. Chemically sandstone is very resistant
Mono-Mineralic rock, with silica as the principal. The percentage of each
constituents is as follows:SiO2 93-94%
Iron (Fe2O3) 1.5%-1.6%
Alumina (Al2O3) 1.4 to 1.5%
Soda (Na2O) & Potash (Kro) 1.0% to 1.2%
Lime (CaO) 0.8% to 0.9%
Magnesia (MgO) 0.2 to 0.25%
Loss On Ignition (LOI) 1.0% to 1.2%
They are highly resistant to acids, alkalis and thermal impact.
