Introduction of types of granite

Release time:

2023-10-26

Granite belongs to the intrusive rocks in the acidic (SiO2>66%) magmatic rocks, which is the most common type of rock in this category, mostly light red, light gray, gray, and so on. Medium-coarse, fine-grained structure, block structure. There are also some complex structures, spherical structures, like gneiss-like structures. The main minerals are quartz, potassium feldspar and acid plagioclase, while the secondary minerals are biotite, amphibole, and sometimes a small amount of pyroxene.

Granite belongs to the intrusive rock in the acid (SiO2>66%) magmatic rock, which is the most common kind of rock, mostly light red, light gray, gray and so on. Medium coarse grain, fine grain structure, massive structure. There are also some speckled structure, spherical structure, like flake like structure etc. The main minerals are quartz, potassium feldspar and acid plagioclase, while the secondary minerals are biotite, amphibole and sometimes a small amount of pyroxene. There are many kinds of accessory minerals, such as magnetite, titanite, zircon, apatite, tourmaline, fluorite and so on. Quartz content is a variety of magmatic rocks in the most, its content can be from 20-50%, a few up to 50-60%. The content of K-feldspar is generally more than that of plagioclase, and the proportion of the two is often that K-feldspar accounts for 2/3 of the total feldspar, and plagioclase accounts for 1/3. K-feldspar is mostly light red, gray and gray in granite. The gray-white potash feldspar and plagioclase feldspar are often indistinguishable on hand specimens. At this time, we should carefully observe the twin crystal characteristics of these two feldspars, because plagioclase has a poly-sheet twin crystal, and when turning the hand specimen, we can see that there are regular light and dark poly-sheets on the plagioclase crystal, while potassium feldspar is a card-type twin crystal, showing two half crystals with different brightness.

Granite can also be further named according to the dark mineral species, such as the dark mineral is mainly biotite, which can be called biotite granite, which is a common type of granite. Such as biotite and muscovite, its content is close to equal, can be called two-mica granite, if the dark mineral to hornblende, is called hornblende granite, if the dark mineral is mainly pyroxene, it is called pyroxene granite, almost does not contain dark minerals can be called algite.

Granite belongs to intrusive rocks in acidic (SiO2>66%) magmatic rocks

Source of granite

Granite belongs to intrusive rocks in acidic (SiO2>66%) magmatic rocks

Source of granite

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