Granite is an intrusive rock in acidic (SiO2>66%) magmatic rock. This is the most common type of rock in this category, mostly light flesh red, light gray, and off-white. Medium-coarse, fine-grained structure, block structure. There are also patchy structures, spherical structures, gneiss-like structures and so on.
The main minerals are quartz, potash feldspar and acid plagioclase, and the secondary minerals are biotite, hornblende, and sometimes a small amount of pyroxene. There are many types of accessory minerals, the common ones are magnetite, sphene, zircon, apatite, tourmaline, fluorite and so on. Quartz content is the largest among various magmatic rocks, and its content can range from 20-50%, and a few can reach 50-60%.
The content of potash feldspar is generally more than that of plagioclase, and the relationship between the two contents is often that potash feldspar accounts for two-thirds of the total feldspar, plagioclase occupies one-third, and potash feldspar is more in granite. It is light flesh red, but also gray and gray.
