The word granite comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a crystalline rock.
Granite is defined as geologist it might be define granite as a coarse-grained, quartz- and feldspar-bearing igneous rock that is made up entirely of crystals. Granite is a one of the common and widely-occurring group of intrusive felsic igneous rocks that form at great depths and pressures under continents. Granite consists of minor accessory minerals such as magnetite, garnet, zircon and apatite. A granite containing both muscovite and biotite micas is called a binary granite. The average density is 2.75 g/cm3 with a range of 1.74 to 2.80.
Occurrence of granite
Granite occurs as relatively small, less than 100 km2 stock-like masses and as large batholiths often associated with orogenic mountain ranges and is frequently of great extent. Small dikes of granitic composition called aplites are associated with granite margins. In some locations very coarse-grained pegmatite masses occur with granite. Granite has been intruded into the crust of the Earth during all geologic periods, except perhaps the most recent; much of it is of Precambrian age. Granite is widely distributed throughout the continental crust of the Earth and is the most abundant basement rock that underlies the relatively thin sedimentary rock veneer of the continents.
Origin of granite
There are two theories for the origin of granite. The magmatic theory states that granite is derived by the crystal fractionation of magma. Thus granite bodies are the result of intrusion of liquid magma into the existing rocks. The granitization theory states that granite is formed in place by extreme metamorphism. There is evidence to support both theories, and both are useful to explain different observed features. The two may actually merge: as metamorphic conditions increase to the melting point of the metamorphosed granite, it will melt and become a liquid magma.
Uses of granite
Granite has been extensively used a dimension stone and as flooring tiles in public and commercial buildings and monuments. There have a plenty of the uses from granites.
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