Limestone is a very common sedimentary rock consisting of calcium carbonate (more than 50%). Limestone is the most common non-siliciclastic sedimentary rock. Carbonate rocks where the dominant carbonate is dolomite (calcium magnesium carbonate) are named dolomite rock. Carbonate rocks together make up one-fifth of all sedimentary rocks in the stratigraphic record. When the word 'stone' is used in the context of slab dimensional stone, it usually refers to limestone, slate and other sedimentary rock. Generally, limestone is rarely polished. Limestone is a durable, versatile stone. It does react to acids and must be sealed to protect against staining. Sandstone is a classic sedimentary rock composed mainly of sand-sized minerals or rock grains. Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Soapstone is dense and heavy, but soft enough to scratch easily. It does not react to acids in foods and does not stain.
