花岗岩和大理石的比较(国外英文资料).docVIP

花岗岩和大理石的比较(国外英文资料) Comparison of granite and marble Reward points: 0 - solve the time: 2007-7-10 20:31 Simply and explicitly: granite is better than marble. What is marble better than granite? Questioner: youlere - Assistant level three Best answer 1 granite Granites belong to igneous rocks, which are formed by the eruption and intrusion of underground magma, cooling crystallization, and granitic metamorphic rocks. Having a visible crystalline structure and texture. It consists of feldspar (usually potassium feldspar and oligoclase) and quartz, with a small amount of mica (Muscovite or biotite) and trace minerals, such as zircon, apatite, magnetite, ilmenite and titanite etc.. The main component of granite is silica, and its content is about 65% - 85%. The chemical properties of granite are weakly acidic. Typically, granite is somewhat white or gray, and is flecked with dark crystals and is colored with potassium feldspar to make it red or flesh colored. Granite is slowly cooled and crystallized by magma, deep beneath the earths surface. When cooling rates are unusually slow, granite forms a very coarse granite, known as crystalline granite. Granite and other crystalline rocks form the basis of continental plates and are also the most common intrusive rocks exposed to the earths surface. Although the granite is considered by melting forming material or magma igneous rocks, but there is a lot of evidence that some form of granite is local deformation or previous rock products, they are not through liquid or melt process and rearrange and recrystallization. The proportion of granite is between 2.63 and 2.75, and its compressive strength is 1050~14000 kg / cm2 (15000~20, 000 pounds / square inch). Because the intensity ratio of sandstone, granite and marble limestone, so it is difficult to mining. Because of the special conditions and firm structural features of granite, it has the following unique properties: (1) with good decorative properties, applicable to public p