1, form: also called sand rock of sandstone, is because of the Earth's crustal movement, sand and cement (clay, iron oxide, silica, calcium carbonate, calcium sulfate, etc) by long-term pressure compression bonded to form a sedimentary rock.
2, composition: composed mainly of sand (silicon dioxide) levels above 65%, and cements.
3, properties: faintly acid.
4, structure: sand particle size, fine texture, loose structure, high water absorption (in defense of high cost), with sound insulation, moisture, breakage resistance, weather-resistant, fade-resistant, do not dissolve in water, no radiation and so on.
Sand 5, cannot be polished, is Matt Stone, showing nature, rich cultural connotations. Sandstone in the decoration shown in simple but elegant, warm, yet luxurious atmosphere of a warm-toned décor, based on the characteristics of this stone, often used for Interior and exterior wall decoration, furniture, sculpture artwork, landscape construction materials.
6, hardness and its cause of sand has an internal connection. Some high quality sandstone structure very closely, its hardness more than granite. In terms of durability, sandstone and marble, comparable to granite. Many of the buildings built of sandstone in one hundred or two hundred years ago has still, and shapely.