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Will Marble Fade?
Jan 03, 2019

1. Will marble fade?





  

1. Will marble fade?


Marble is mainly composed of minerals such as calcite and dolomite. It is often the former. The calcite formula is CaCo3 marble is CaMgCo3, all of which have carbonate [CO3]; ions, which are more active and easy to interact with sulfur dioxide in the air to form gypsum ( CaSO4].2H2O, this gypsum is turbid particles, and calcite is easy to interact with water to form calcium bicarbonate (CaHCO3)2 dissolved in water. After the water is lost, it turns into calcium carbonate (calcite) (karst in limestone area) , stalagmites, stalactites are formed in this way, especially the open-air stone is not suitable for marble. This is the reason, as the marble of the exterior wall finish, the color will generally fade after 2-3 years.


  

2. Will granite fade?


This problem is commonly asked by the purchaser. Compared to marble, granite can be said to "never fade", but in the long run, granite still needs to fade. It’s just time.


The rock that can make granite is mainly magma. Such as feldspar, quartz, pyroxene, amphibole, mica, etc. In these silicate mineral structures, each silicon ion is surrounded by four oxygen ions, and four oxygen ions are distributed on the top of the four corners. Silicone tetrahedron, which is the basic structural unit of silicate. It is quite stable in nature, strong in acid resistance, difficult to dissolve, weather resistant, and does not discolor. It does not interact with the acid in the air to form a cloud-like shape. The gypsum particles are attached to the surface to discolor it.


But the material that is absolutely stable in nature is not, the rock is no exception, and the mountains will be flattened, let alone granite? Rocks are composed of minerals. Minerals can become other secondary minerals due to various reasons, such as hot water action and weathering. For example, potassium feldspar, mica, hornblende become kaolin, limonite, and pyroxene often becomes Orolithite, chlorite or calcite, olivine into serpentine, magnesite, after these changes, the color of the rock must also change, but this process is quite long, and some are not in our short life experience. Can observe, actually can not wait for this change, the color has changed

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