SANDSTONES
Sedimentary rock, composed of quartz grains, usually cemented by silica, carbonates or sulphates, used in construction and paving. They are great insulators of heat and cold. Porous.
Sedimentary rock, composed of quartz grains, usually cemented by silica, carbonates or sulphates, used in construction and paving. They are great insulators of heat and cold. Porous.