granite

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granite,

coarse-grained igneous rockrock,
aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.
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 of even texture and light color, composed chiefly of quartz and feldspars. It usually contains small quantities of mica or hornblende, and minor accessory minerals may be present. Depending on the feldspar present, granite may be pink, dark gray, or light gray. It is commonly believed to have solidified from molten rock (called magma) under pressure. However, some granites show no contacts with surrounding wall rock, but instead gradually grade into metamorphic rock. Others show relic features found in sediments. This evidence suggests that some granites are not igneous in origin, but metamorphic. Some granites are the oldest known rocks on earth; others were formed during younger geologic periods. Crystallized at depth, granite masses are exposed at the earth's surface by crustal movement or by the erosion of overlying rocks. Very coarse-grained granite, called pegmatite, may contain minerals and gemstones of economic value. Such pegmatites are found in the Black Hills of South Dakota. Granite has been used since ancient times as a building material.

granite

An igneous rock having crystals or grains of visible size; consists mainly of quartz and mica or other colored minerals.
See also: Stone

Granite

 

a magmatic rock rich in silica.

One of the most common rocks of the earth’s crust, granite is composed of potash feldspar (orthoclase, microcline), acid plagioclase (albite, oligoclase), quartz, mica (biotite or muscovite), amphibole, and, more rarely, pyroxene. The structure of granite is usually holocrystalline and frequently por-phyraceous and gneissoid-banded. It is predominant among intrusive rocks and occupies an essential place in the geologic structure of the Urals, the Caucasus, the Ukraine, Karelia, the Kola Peninsula, Middle Asia, and Siberia. Granitic intrusions date from the Archean and Cenozoic eras. Granite usually occurs in rocks in the form of batholiths, laccoliths, bosses, and veins. During the formation and cooling of the granitic bodies a regular system of joints arises; the jointing is. as a result, characteristically parallelepipedal, columnar, or sheetlike in natural exposures. The rounding of corners through weathering forms hammock jointing. The weathering of granite takes the form of disintegration or kaolinization. Deeper changes in the granite can be produced by pneumatolytic processes, resulting in the formation of greisen with lithia mica or tourmaline.

The origin of granite, in addition to its scientific interest, has great practical importance, since certain granitic bodies are associated with deposits of various valuable metals, such as tin, wolfram, molybdenum, lead, and zinc. Pegmatitic veins, which in certain cases are sources of rare-metal mineralization and high quality raw materials for ceramics (for example, feldspar, mica, and muscovite), are associated genetically with granite.

Because of its physical and mechanical properties, granite is an excellent building material. Its massiveness. density, and wide textural potentials (the ability to take on a mirrorlike polish, on which light brings out the play of colors of the ingrained mica, or the sculptural expressiveness of the unpolished rough stone, which absorbs light) make granite one of the basic materials for monumental sculpture. Granite is also used in obelisks, columns, and as a facing for many buildings. Most of the granite used in the USSR comes from quarries in the Ukraine, the Urals, and Karelia.

REFERENCES

Levinson-Lessing, F. Iu. Izbrannye trudy, vol. 4: Petrografiia. 1955.
Menert, K. Novoe o probleme granitov. Moscow, 1963. Petrov, V. P. “Sovremennoe sostoianie predstavlenii o magme i problema granita.” Izv. AN SSSR: Ser. geol., 1964. no. 3.

granite

[′gran·ət]
(petrology)
A visibly crystalline plutonic rock with granular texture; composed of quartz and alkali feldspar with subordinate plagioclase and biotite and hornblende.

granite

1. An igneous rock having crystals or grains of visible size; consists mainly of quartz, feldspar, and mica or other colored minerals.
2. In the building stone industry, a crystalline silicate rock having visible grains; this includes gneiss and igneous rocks that are not granite in the strict sense.

granite

1. a light-coloured coarse-grained acid plutonic igneous rock consisting of quartz, feldspars, and such ferromagnesian minerals as biotite or hornblende: widely used for building
2. another name for a stone
References in periodicals archive ?
Like many other past fallers at the obstacle, Granit Jack made no semblance of a mistake but instead seemed to be brought to the ground due to the speed at which he was travelling.
Granit Jack and Willyanwoody were killed in action when falling at the notoriously tricky penultimate fence and third-last respectively; Granit Jack broke his neck and died instantly, Willyanwoody fractured his back and was put down.
Without a win since scoring at Uttoxeter more than two years ago, Granit D'Estruval was close to the pace throughout and displayed commendable stamina to prevail, proving the sixth British-trained winner in the history of the race.
Together with Graham Lee, both expressed commiserations with Granit Jack's team as L'Antartique was led away following his triumph over Il Duce and Knowhere.
But he left all that behind yesterday as Harding took up the running three-quarters of a mile out before Granit D' Estruval showed rare courage to hold the challenge of Marcus Du Berlais after the last.
Heard put not a foot wrong and as they came down to the second-last with Granit Jack still tanking along, some recompense for Willyanwoody, and the happy dream of the vastly promising Granit Jack taking a huge step along the road to a possible Queen Mum tilt, looked the likely outcome.
ROCK SOLID: Brian Harding celebrates his victory on Granit D'Estruval yesterday
Granit is bound to complete construction works in a year.
Some might question the wisdom of running such an inexperienced horse in a competitive handicap like the Paddy Power, but that would be sick aftertiming, as Granit Jack jumped unbelievably well before his fall (the fact he was as low as 1.
William Hill: 5 Twist Magic, Well Chief, Voy Por Ustedes, 8 Monet's Garden, My Way De Solzen, 10 Nickname, 14 Mansony, 16 Ashley Brook, Dempsey, Fair Along, Newmill, 20 Don't Push It, Granit Jack, 33 Faasel, Foreman, Lennon, Sporazene, 40 bar.
Granit has also posted a non-audited balance of profit and loss for the period between 1 January and 30 June 2009.
I don't bet much nowadays, but like a few Cheltenham ante-post wagers and have already backed Granit Jack each-way for the Champion Chase at 40-1.