What rocks are the most important economic rocks of granite or basalt rocks and why?

Garnite

 Is a surface rock that is under high temperature. Granite is mainly formed of three alkali metals, aluminum alkali silicate and plagioclase. These minerals make granite white, crimson or light gray. Granite also contains small amounts of dark brown or dark green or black minerals such as mica hornblend and biotite. Granite granules are so large that they can be easily separated. The width of many atoms is 0.5 cm. Metal in the granite is intertwined as cutting in the game of tipped pieces. As a result, granite is a hard rock that is durable and useful in building construction. Most granite can withstand erosion for centuries, and can be polished to make it smooth to make columns, tombstones and monuments to be long lived.

This type of rock used widely used to carve statues and columns, which is characterized by his assumption of factors, sculpture and erosion more types of sedimentary rocks. The granite is of great economic importance and is also used in homes such as ladders and kitchens of the types known as the Arabian Gulf, Albilenko, New Bank and Aswaat Salmon, Aldark and Najran Brown is located only in Najran South Saudi Arabia and are the LightGold and other types of industry is spread in the Gulf and Saudi Arabia because of the ownership of there are nature individually several major companies, including, Saudi bin Laden Group or as known in the field of international granite marble and granite company and Saudi factory, granite national and national progress, the United Yamama and Tneat and other companies a T has a long-term experience in this field.

Basalt

Basalt rock is a surface rock and its texture is microscopic or microscopic because its crystals harden near the surface of the earth. This does not give the ions the chance to gather around the crystallization center, so its texture is very precise. The basalt is a heavy rock and very solid when touched. It is very difficult to disperse

Basalt is a solid black volcanic rock. Containing less than 53% of silica (SiO2). Due to the low basiltic content of silica, the viscous rocks (resistance to flow) are low. So basaltic lava can flow quickly and move easily. The low viscosity of volcanic gases allows for the exit without generating massive explosions. But basaltic lava fountains and crack holes still form explosive fountains that are hundreds of meters long. Among the common crystals in basalt: Olivine, Pyroxene, and Plagioclase. The basalt

explodes at temperatures between 1100 to 1250 ° C.

 the most important economi

is garnaite