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GRANITE

Granite is the hardest stone and because of its architecturally fine-looking is vastly used as building stone. The word granite comes from the Latin, a grain, in orientation to the coarse-grained formation of such a crystalline rock. It takes an extremely polished finish, which tolerate it even in rough environments. It also available in range of other finishes. Granite is a generally occurring type of igneous rock which is rough and crystalline in texture. This rock consists mostly of quartz, mica, and feldspar. Granite rocks are created when a discourse of rising magma is cooled in two stages. In the 1st stage, the magma is cooled slowly unfathomable in the crust, creating the large crystal grains. In the 2nd stage, the magma is cooled rapidly at relatively superficial distance downward or as it explodes from a volcano, creating small grains that is typically invisible to the independently eye. Infrequently some individual crystals are larger than the groundmass, in this case the quality is known as porphyritic. A granite rock with a porphyritic texture is sometimes identified as porphyry.

Granite is found in many colors like pink, gray, red etc. depending on their chemistry and mineralogy. Granite is an igneous rock with at smallest amount twenty percent of quartz by volume. Granite is different from granodiorite in that at least thirty percent of the feldspar in granite is alkali feldspar as contrasting to plagioclase; it is the alkali feldspar that provides several variety of granite a unique pink color. Projections of granite have a tendency to form tors and rounded massifs. Sometime granite occurs in round depression surrounded by a range of hills, formed by the metamorphic. Granite is generally found in the continental plates of the Earth's crust. The Red Pyramid of Egypt named for the light red shade of its exposed granite surfaces is the 3rd largest Egyptian pyramid. The Great Pyramid of Giza contains a huge granite tomb fashioned of Red Granite. Several large Hindu temples in south India, mostly those built by the king Raja Chola I, were made of granite. There is a large amount of granite is used in these structures. In some areas granite is used for tombstone and monument. Granite is a solid stone and requires skill to shape it by hand. Until the early 18th century granite could only be shaped by hand tools with usually poor results. A solution infiltrate was the development of steam-powered cutting and dressing tools by Alexander MacDonald, inspired by considering ancient Egyptian granite carvings. In 1832 the first polished tombstone of Aberdeen granite to be set up in an English graveyard at Kensal Green graveyard. It caused awareness in the London monumental trade and for some years all polished granite ordered came from MacDonald.

Modern technique of carving granite includes using computer-controlled rotary bits and sandblasting over a rubber stencil. Leaving the letters, numbers and emblems exposed on the stone, the blaster can create virtually any kind of artwork or epitaph. Granite has begun to replace marble as a monument material, since it is much more durable. Polished granite is also a fashionable selection for kitchen countertops due to its high durability and visual qualities. In building and for countertops, the word "granite" is frequently functional to all igneous rocks with large crystals, and not exclusively to those with a granitic composition. Granite is a usual source of emission, like most natural stones. However, some granite has been reported to have higher radioactivity thereby raising various anxiety about their safety. A number of granite contain around 10 to 20 parts per million of uranium. By contrast, more mafic rocks such as tonalities, gabbros or diorite have 1 to 5 parts per million of uranium, and limestone and sedimentary rocks usually have equally low amounts. Several huge granite plutons are the resource for palaeochannel-hosted or roll front uranium ore deposits, where the uranium washes into the sediments from the granite highlands and linked, frequently extremely radioactive, pegmatite. Granite could be measured a prospective natural radiological danger as for example, villages situated over granite may be at risk to higher doses of radiation than other population. Underground room and basements ruined into soils over granite can become a trap for radon gas, which is produced by the decomposition of uranium. Radon gas cause major health concerns and the number two reason of lung cancer in the World behind smoking. Thorium occurs in all granite as well. Conway granite has been noted for its relatively-high thorium attention of 56 parts per million of uranium.
Some Types of Granite:

    Hornblende Granite

    Hornblende granite is the darkest range of granite. It is tough in all types of weather, making it ideal for almost any use.
    Biotite Granite

    Biotite granite is obtainable in a large range of colors and is one of the most commonly used granite for building. It is the hardest of all granite and can be used indoors or outdoors without compromising the stone.
    Talcose Granite

    Talcose granite is one of the slighter known forms of granite because it doesn't withstand elements well. That makes it less than ideal for flooring, countertop and outdoor use, which leaves only decorative purposes.
    Tourmaline Granite

    Tourmaline granite is obtainable in huge range colors, with the exception of colorless and white, which are extremely rare. This type of granite is ideal for areas without a lot of traffic, as it is the softest of all types.
    Color Classifications

    Some companies categorize granite according to colors in its place of by composition. Companies that categorize in this manner boast over 100 types of granite. However, choosing granite based on color alone is a recipe for disaster as the granite you choose may not be appropriate for the application.

Granite is an extremely common word and is applied to a complete mass of different rocks. Some verity of granite has been recognized on their various chemical and mineralogical compositions. Commonly the term granite is used as a suffix to indicate its textural and general composition. If granite is rich in lithium then the rock might be referred to as lithium granite. Also, petrologists may choose to categorize different but parallel granitic rock types by using the terms such as granodiorite or syeno-granite. Some granite is named according to their strange characteristics. In some granite the feldspars had time to form rectangular crystals before quartz and the other minerals crystallized. The resulting rock appears to be a collection of opaque letters, numbers or figures and this rock is called "Graphic Granite".

There is hundreds of granite that are given local or marketable names. Some of these names are descriptive such as representative a remarkable color or indicate the source of the rock such as Pikes Peak Granite. Many of these granites are unique and many rock smiths can easily differentiate where a sample came from.

Granite is found in all continents around the world and is usually the establishment of numerous organic belts or mountain chains. Most often granite is the original rock upon which sedimentary and other continental rocks rest. Granite is found in batholiths or large magma plumes that rose into the continental rocks. But it can be seen in lots of other intrusive features such as dikes, sills and laccoliths.
The Four Main Minerals:

    Quartz:

    Quartz is a common mineral that is found in numerous types of rocks. The chemical formula is Silicon oxide (SiO2). An impurity in the rock at the time of formation causes the quartz crystal to create different colors. Quartz can be colored brown to black, yellow, milky white, rose, blue and the best known color purple amethyst.
    Feldspar:

    Feldspar is the mainly rich mineral in rocks that are located at or near the earth's surface. Feldspar can have a glassy white, blue, green, pink or red crystal. When feldspars are exposed to the environment they weather conditions easily. Clays are formed by weathered feldspar. Kaolinite is the main quality of the feldspar clays used by potters.
    Hornblende:

    Hornblende is a mineral that contains magnesium, iron, silica and aluminum. Hornblende is black, brown and green in color. It occurs in crystals of many igneous rocks.
    Mica:

    Mica can be clear, black, green, red, yellow, brown, purple lapidolite and other colors too. Clear mica was named Muscovite because it was found close to Moscow, Russia. It was used as window glass in the Muscovite's homes. Muscovite contains water which helps to make it clear. Biotite mica is dark green to black in color because it contains metals such as iron and magnesium.

    As you can see the unusual colors produced by these four minerals alone can give granite in many several colors. Add other accessory minerals and loosely associated types of granite and you get quite an array of colors.