The types and applications of stone-natural slate

A natural slate,: refers to the extraction from the natural rock sedimentary rocks, metamorphic rocks and magmatite in rocks

slate, after processing, the shaping of a general plate and cylindrical materials, slate is has the dual function of architectural and decorative materials; natural slate generally refers to the decorative building of marble, granite and slate part, mainly refers to the mirror plate, including sub board, fire board, sandblasting panels and surface decorated with slate, slate, plate. Classification method of natural slate is not unified, in accordance with the process of commercial classification: marble, granite, slate class.  

(a), marble: decorative pieces, and processing all kinds of carbonate or magnesium carbonate and related metamorphic rocks referred to as marble; the major rock forming minerals are calcite or dolomite, the chemical composition of carbonate rocks (calcium carbonate, magnesium carbonate) of pure white Dali natural slate (often referred to in China the white marble, and other impurities) often contain natural slate, containing carbon black, iron rose color, orange, green, copper containing ferrous oxide, thus showing a white marble, black, red, yellow, green, grey and brown colored markings; because the main chemical composition is CaO, marble MgO, the corrosion resistance is poor, generally do not do outdoor decorative board.

(two): granite is decorative, into all kinds of magmatite block and machinability and silicate rock minerals in metamorphic rocks called granite; granite is the most rugged rock magmatite, the most stable and most colors, its performance is better than that of marble and other rocks; the bulk density is 2.63-2.8g/cm3, 100-300Mpa the compressive strength of granite is holocrystalline rocks, composed of quartz, feldspar and a small amount of mica and dark mineral, its durability, frost resistance, service life of up to 75-200 years, according to the degree of surface processing can be divided into thin plate (RB), namely, smooth surface, mirror plate (PL) smooth surface plate with specular gloss, rough plate (RU) smooth surface roughness.