Iran Stone

How Granite Is Formed

If we want to speak about the granite stone and how it is produced and formed, it should be said that granite is an igneous rock. It is formed from magma. Most of it forms deep in the crust of the Earth. Most granite rocks are more than a mile deep in the continental crust of the Earth. Scientists and researchers still do not agree how much of it makes its way to the surface and becomes visible to them.
Granite can be formed by the crystallization of igneous intrusions that contain elements like quartz, plagioclase feldspar and alkali feldspar.
Granite is a natural stone product. It is estimated that our Earth is at least 4.5 billion years old. When Earth was forming and creating it was a hot ball of liquid rock. While the Earth cooled, three kinds of rock were formed. These three types of rock are metamorphic, sedentary, and igneous. Granite is a rock in the category of igneous type. When the magma cooled, igneous rock was created deep below the surface of the earth.
Granite is one of the hardest types of rock. Granite is crystalline in the nature. Crystalline rocks make up the base for the continental masses. Crystalline grains fit together very tightly forming granite. Granite is made up of various minerals, but quartz and feldspar are always in its components. These components were pressed together over millions of years and immense pressure and force. The quartz and feldspar are the lighter colors, the whites and pinks, which can be seen when we look at a piece of granite. The darker colors are produced by a variety of other minerals such as black mica and/or amphibole.
Most of the granite is igneous and plutonic in nature. That is to say that it began as a molten liquid state that solidified as it cooled. It is the random way the individual grains are mixed and composed together that led scientists to this conclusion. Granitic is what geologists call any light-colored rock with crystalline grains that is plutonic in nature.
Igneous rock has differing textures according to place it is found and the cooling rate of it. The texture is determined by the rate in which it was cooled. Granite composed of larger crystals was formed nearer to the Earth's core where it cooled more slowly because of lacking the air. This granite is generally lighter in color. Granite which formed closer to the surface of the Earth cooled more quickly since the upper sections can reach the air to cool the magma and the result was a granite rock with smaller crystals which are usually darker in color. This resulted in a stronger stone. For instance the predominant regions where granite is produced are areas in Brazil, China, India, Saudi Arabia, Italy, and the Scandinavian countries.
In a granite rock, the main two components (quartz and feldspar) are stronger than steel. Also the way the individual mineral grains have formed together give granite its strength. There is another type of granite called granite Gneiss. This type has the same composition as granite but it is created through a metamorphosis of sedimentary rocks. This type has a strong fabric whereas granite lacks fabric. The different types of granite come from different areas of the world.
Granite rock comes in a wide variety of colors and shades. From greens, blues, reds, browns, pinks, and yellows to blacks and whites. Due to its powerful, strength and beautiful array of colors, this beautiful stone lends itself well for many applications in both residential and commercial constructions.
One type of rock is called White Tank Granite. It is an igneous rock which formed when hot magma or liquid rock was pushed up and cooled from deep in the Earth and forced into the overlying rock in a process known as intrusion. It then cooled and hardened and later became exposed as the rock that we could see today. Geologists believe that the White Tank Granite was intruded into the overlying rock about 135-155 million years ago.
As said above, while the Earth cooled, three types of rock were formed and created. These three types of rock are metamorphic, sedentary, and igneous. Granite stone is in the category of igneous rock. Igneous rock was created deep below the surface of the earth when the Earth's magma cooled.
The minerals that are found in granite and mainly composed it are primarily quartz, plagioclase feldspars, potassium or K-feldspars, hornblende and micas. Quartz is usually the last mineral to crystallize and fills in the extra space of the other minerals. Quartz's hardness, lack of chemical reactivity and near lack of cleavage and segmentation give granite a significant amount of its desirable durable features or properties. The quartz will appear gray, but is actually colorless and is reflecting and fusing the colors of the white and black minerals surrounding it. The plagioclase feldspars are generally white with parcel and brilliancy. The K-feldspar parts are generally the ones that give granite its color variations from yellow to orange to pink or blue. Dark K-feldspars can also give granite its black varieties as well. The micas are generally muscovite (silver), biotitie (black or brown) or lepidollite (violet or pink) and provide the sparkle that some of granite rocks possess. The hornblende and biotite parts of the rock provide granite with the black pepper portion of the famous and known and distinctive "salt and pepper" look to classic granite stone.
Granitoids are an omnipresent component of the crust. They have been crystallized from magmas that have compositions at or near a eutectic point (or a temperature minimum on a cachectic curve). Magmas will evolve to the eutectic point because of igneous differentiation, or because they represent low degrees of partial melting. Fractional crystallization performs to reduce and fall a melt in iron, magnesium, titanium, calcium and sodium, and enrich the melt in potassium and silicon - alkali feldspar (rich in potassium) and quartz (SiO2), are two of the defining constituents of granite.
This process operates regardless and inattentive of the origin of the parental magma to the granite, and unmindful of its chemistry. However, the composition and origin of the magma which differentiates into granite, leaves certain geochemical and mineral evidence with respect to what the granite's parental rock was. The final mineralogy, texture and chemical composition of granite is often distinctive as to its origin. For example, granite which is created and formed from melted sediments may have more alkali feldspar in it, whereas granite derived from melted basalt may be richer in plagioclase feldspar. It is on this basis that the modern "alphabet" classification schemes are based. Granite rock has a slow cooling process which forms larger crystals.
Some accessory minerals include valuable gemstones, such as tourmaline, beryl, topaz, zircons and apatite. These minerals are generally scattered in the groundmass and generally do not affect the overall appearance of the stone as they are very few in the rock. Other accessory minerals are important economically such as phosphates and rare earth oxides. Identifying with the rare earth elements is a significant concentration in granite of the element uranium. Granite is actually rather radioactive and has 5 to 20 times the concentration of uranium compared to other common rock kinds. Some health concern exists in areas that are rich in granitic territories, as background radiation is enhanced by the presence of large granite bodies. Although the uranium is generally not concentrated enough to make granite a uranium ore or politically valuable rock, the leaching and erosion of granite has helped create most of the uranium ore deposits all over the world.