Natural marble is the metamorphic rock formed by the original high-temperature and high-pressure rock in the crust. Belong to the hard stone, mainly composed of calcite, limestone, serpentine and dolomite. The main component of calcium carbonate, accounting for more than 50%. There are other magnesium carbonate, calcium oxide, manganese oxide and silicon dioxide. As the marble generally contains impurities, and calcium carbonate in the atmosphere by carbon dioxide, carbides, moisture also easy to weathering and erosion, leaving the surface quickly lose its luster. Therefore, a few, such as white marble, Ai Ye Qing and other pure, less impurities and more stable and durable varieties can be used outdoors, other varieties should not be used outdoors, generally only for interior decoration.
Natural marble can be made into high-grade decorative veneer for interior walls, frontal, balustrades, floors, sills, service windows in public buildings such as hotels, exhibition halls, theaters, shopping malls, libraries, airports, Taiwan, the elevator door face decoration, etc., is the ideal indoor advanced decorative materials. In addition can also be used for making marble murals, handicrafts, daily necessities and so on.
Marble is a recrystallized limestone that softens at high temperatures and pressures and re-crystallizes to form marble as the contained minerals change. The main ingredient is calcium and dolomite, many colors, usually with obvious patterns, a lot of mineral particles. Mohs hardness of 2.5 to 5 between.
Marble is divided into three categories:
Dolomite: magnesite (calcium magnesium carbonate) content of 40% or more
Forsterite: Magnesite (calcium magnesium carbonate) content of 5% to 40%.
Calcite: magnesite (calcium magnesium carbonate) content of less than 5%
Limestone is a bluish-gray or off-white rock that is hard in nature and is commonly used in the construction industry. Its main chemical component is calcium carbonate. With hydrochloric acid to generate carbon dioxide, water and calcium chloride (CaCl2); calcined calcined get lime (scientific name of calcium oxide CaO) and emit carbon dioxide. It is also an important raw material for the construction industry. Quicklime and water react to produce slaked lime [Ca (OH) 2, also known as slaked lime] and release a large amount of heat. CaO + H2O ==== Ca (OH) 2