Granites are felsic intrusive igneous rocks whose textures are phaneritic and granular. In Baltimore granite rocks vary a lot in their color depending on mineralogy. Some examples of colors include white, gray, and pink. The name granites derives from granum, which is the Latin word for grain. The name grain is inspired by the coarse-grained structure the rock has. Any intrusive igneous rock with a coarse-grained texture to granites and a slightly different origin or composition is described as granitic.
The classification of granite is done based on the QAPF diagram for course-grained plutonic rocks. The naming is done according to the percentage of alkali feldspar, quartz, and plagioclase feldspar. According to modern petrologic convention a true granite should contain both alkali feldspar and plagioclase. The term alkali feldspar granite is used for granitoids that are devoid or almost devoid of plagioclase.
Granitoids are called tonalites if their orthoclase composition is less than ten percent. Amphinole and pyroxene are the common components of tonalites. If the granite is composed of biotite mica as well as muscovite mica, it is called two-mica or binary granite. The composition of binary granites has large quantities of potassium and small quantities of plagioclase. Two-mica granites are normally A-type or S-type granites too.
The occurrence of granites is in the form of outcrops that form rounded massifs and tors. They may also occur in circular depressions surrounded by hill ranges created by hornfels. The rock also makes the bulk of the continental plates that make the crust. Its presence has only been proven on earth where its distribution in the crust is wide. The rock intruded into the crust throughout all geologic periods.
The origin of the granite industry lies in the ancient Egypt. Worldwide, this is among the oldest industries. The production and export of these rocks is done in many countries. Key exporters are Spain, China, Italy, Brazil, Canada, Germany, Sweden, and India. Exports are directed to many countries and they earn exporters huge foreign exchanges. Various industries find use for granites, including engineering, building and construction, and sculptures and memorials.
In many places around the world, granites are used as memorials and gravestones. The rock is a hard one and requires a lot of skill to carve. Before the 18th century, only hand tools were used in carving granites, which often led to poor results. The invention of steam-powered cutting and dressing tools revolutionized the process of making sculptures and memorials.
Currently, methods for rock-carving have been invented. Among them are sandblasting and the use of computer-controlled rotary bits. Complex artworks can be created easily using these methods. In building and construction, dimension stones and flooring tiles are made out of granites. Granitic flooring times make floors in monuments and commercial as well as residential buildings.
Granites are held in high esteem by rock climbers because of their soundness, friction, crack systems, and steepness. There are many sites in the world that offer good granite climbing spots. They include Yosemite, Adamello-Presanella Alps, the Aiguille du Midi, the Cornish coast, and the Bugaboos. The design of artificial rock climbing walls installed in theme parks and gyms resembles granites.
The classification of granite is done based on the QAPF diagram for course-grained plutonic rocks. The naming is done according to the percentage of alkali feldspar, quartz, and plagioclase feldspar. According to modern petrologic convention a true granite should contain both alkali feldspar and plagioclase. The term alkali feldspar granite is used for granitoids that are devoid or almost devoid of plagioclase.
Granitoids are called tonalites if their orthoclase composition is less than ten percent. Amphinole and pyroxene are the common components of tonalites. If the granite is composed of biotite mica as well as muscovite mica, it is called two-mica or binary granite. The composition of binary granites has large quantities of potassium and small quantities of plagioclase. Two-mica granites are normally A-type or S-type granites too.
The occurrence of granites is in the form of outcrops that form rounded massifs and tors. They may also occur in circular depressions surrounded by hill ranges created by hornfels. The rock also makes the bulk of the continental plates that make the crust. Its presence has only been proven on earth where its distribution in the crust is wide. The rock intruded into the crust throughout all geologic periods.
The origin of the granite industry lies in the ancient Egypt. Worldwide, this is among the oldest industries. The production and export of these rocks is done in many countries. Key exporters are Spain, China, Italy, Brazil, Canada, Germany, Sweden, and India. Exports are directed to many countries and they earn exporters huge foreign exchanges. Various industries find use for granites, including engineering, building and construction, and sculptures and memorials.
In many places around the world, granites are used as memorials and gravestones. The rock is a hard one and requires a lot of skill to carve. Before the 18th century, only hand tools were used in carving granites, which often led to poor results. The invention of steam-powered cutting and dressing tools revolutionized the process of making sculptures and memorials.
Currently, methods for rock-carving have been invented. Among them are sandblasting and the use of computer-controlled rotary bits. Complex artworks can be created easily using these methods. In building and construction, dimension stones and flooring tiles are made out of granites. Granitic flooring times make floors in monuments and commercial as well as residential buildings.
Granites are held in high esteem by rock climbers because of their soundness, friction, crack systems, and steepness. There are many sites in the world that offer good granite climbing spots. They include Yosemite, Adamello-Presanella Alps, the Aiguille du Midi, the Cornish coast, and the Bugaboos. The design of artificial rock climbing walls installed in theme parks and gyms resembles granites.
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