Among the igneous rocks, Granite is a very common one. Fundamentally, most of it is found under the crust of the earth.. Granite is an invasive igneous rock. The intrusive rocks are developed by the slow cooling of magma and solidification of the molten material beneath the ground. Granite is revealed in due course when the overlying rocks are detached. Generally the texture of granite is coarse (seen without magnifying glass), the slow rate of cooling of magma under the ground, allows the crystal to grow bigger.
The term “granite” is derived from the Latin word “Granum”, meaning grain, it corresponds to the coarsely grained formation of this Holocrystalline rock. The word ‘granite’ relates to a family of igneous rocks that are intrusive, having similarity in their textures and a minimal variation in their originality and composition.
Some Granite Properties:
Granite is outstandingly resistant to abrasion on account of the hardness content of quarts which is 7 and feldspar that is 6. Granite is important in the building industry.
Some of the granites undergo comparatively very few changes under the influence of temperature. This makes granite a good preference for use where highly precise functioning is required and only small changes take place on account of the impact of temperature.
Where the function is to bear heavy loads granite is used because of its flexural power or the power to withstand any force of the bend.
Granite has the power to resist various caustic chemicals and acids. As such; granite is used for the purpose of lining in commercials vats and so on. Therefore, granite is used in applications in the lower grades where there is contact of water and soil.
Uses of Granite
Very frequently granite is quarried for the use of “dimension stone” (a rock that is obtained naturally, and has the ability to be cut as blocks into desired length, thickness and width). Granite is so hard that it withstands almost every abrasion, is sturdy enough to bear major weight, and braves the vicissitudes of harsh weather conditions when inserted in order to resist the weather and also takes polish brilliantly.
The majority of the granite dimensional stone is a product of the United States and its deposits are of high degree in the five states: Idaho, New Hampshire, Georgia, Massachusetts and South Dakota
Granite is mainly comprised of four minerals, it is an igneous rock. The four big crystals of the four minerals Feldspar, Mica, Quartz and generally Hornblende are visible without magnification because magma cools gradually down beneath the surface of the earth.
But, granite is not composed homogeneously. The compositions of granite vary, since it depends on its site. The composition of the granite which has lesser input minerals provides it with a range of variant look as well as color.
Geologically, granite is defined as “any plutonic rock in which the mineral quartz makes up 10 to 50 % of the Felsic components, and the proportion of alkali to total feldspar is between 65 and 95 %” but, you are likely to come across offer from traders that are not precise. These traders mention the name granite for any type of Holocrystalline quartz that bear Plutonic rocks and obviously these rocks resemble granite and are likely to possess most of its properties.
For thousands of years granite are used for outdoor as well as indoor purposes. Refined granite as well as rough cut granite is used in most of the outdoor projects, bridges, monuments, paving and buildings. In the interiors slabs and tiles of granite that are polished are used as stair treads, countertops, floor tiles and innumerable decorative and practical functions.
Based on the 2485 analyses, and weight percentage, the chemical composition of granite world over is:
Al2O3 14.42% (alumina)
SiO2 72.04% (silica)