Classification and characteristics of

Granite formation conditions as ingredients to form complex and diverse, so the variety, there are a variety of classification. Sub-divided according to types of minerals contained in black  tile saw blade granite, muscovite granite, hornblende granite, two-mica granite. Constructed according to the structure can be divided into fine-grained granite, medium-grained granite, coarse-grained granite, porphyritic granite, porphyritic granite, geode granite and gneissic granite. Press contain minerals can be divided into cassiterite granite, niobium ore granite, granite containing beryllium, lithium mica granite, tourmaline granite. Common length petrochemical, greisenized, electrical and petrochemical since metamorphism.Granite compact structure, high compressive strength, low water absorption, surface hardness, good diamond core drills  chemical stability, durability, fire resistance, but poor. Granite was fine, the grain, coarse granular structure, or porphyritic structure, fine uniform particles, the gap is small (porosity of 0.3% to 0.7%), water absorption is not high (water absorption is generally 0.15 % ~ 0.46%), with good frost resistance. High hardness of granite, its Mohs hardness of about 6, a density of 2.63g/cm3 to 2.75 g/cm3 in between, the compression strength of 100-300MPa, in which fine-grained granite up to 300MPa or more, flexural strength Average at 10 ~ 30Mpa. Often granite batholith, rock plants, rock and green concrete blades  other forms of output, and is subject to regional tectonic control, generally larger than the size distribution is relatively broad, so mining convenient, easy out aniseed, and its joint development with the law, help shape the rules mined stone. Shortage of granite into high, can carry a variety of machining, sheet metal can fight good. There weathered granite is not easy, I can do outdoor decorative stone. Granite texture uniform texture, color, although dominated by light colors, but also very rich in red, white, yellow, green, black, purple, brown, beige, blue, etc., and relatively little change in its color, suitable for large the area of ​​use.