Granite will fade it?

The problem is consumers often mentioned, but in terms relative to the marble, granite can say "never fade." But in the long run, granite will fade, but it is time.

     Granite mineral is mainly composed of feldspar, quartz, mica, pyroxene, hornblende and other components. Some silicate minerals in the main structure, each silicon ions are surrounded by four oxygen ions, while constituting silicon-oxygen tetrahedron. This basic structural unit, nature is quite stable, acid and alkali can be strong, insoluble, resistant to weathering, no discoloration good.

     Granite stone fade because of different varieties also have differences. Generally speaking, the more dark colored granite easily fade, because dark color (such as black, dark green) is mainly composed of granite mineral pyroxene, hornblende, magnetite and other basic plagioclase. Light-colored granite mainly acidic plagioclase, K-feldspar, biotite, quartz. Minerals are generally formed in the ground, some minerals formed first, after some form. First form is often heavier atomic weight of the elements, the position of deeper, less oxygen supply, greater pressure; after the formation of the opposite. Therefore, different minerals generally have different formative years, which is roughly the order: dark minerals: olivine - pyroxene - hornblende - biotite; light-colored minerals: mafic plagioclase - acidic plagioclase - K-feldspar Stone - Quartz. After the formation of the first exposure to the mineral surface, greatly due to environmental changes, easy to produce secondary changes, the change is less formation of late, the most stable quartz. Another case is of secondary minerals than the primary minerals easy to fade, such as epidote, chlorite become the main green, grass green decorative plates, after 5--10 years, the color is fading, but with marble phase ratio, this change is still very weak. Color change (fade) also related to the environment, a high acid content in the industrial zone in the air, then easily change fade. Also maintenance level is also important.