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 ?
Geochronological, isotopic, and geochemical data from Permo-Triassic granitic gneises and granitoids of the Colombian Central Andes.
Abu granitoids, NW India: Regional correlation and implications for Rodinia paleogeography.
1, 7)--Over the weathered granitoid batholith lie down first polygenic conglomerates and minor sandstone bodies; they locally contain some pebbles of Triassic dolostones.
There are noticeable differences of more than four orders of magnitude between the permeabilities of the granitoids depending on the region.
The HP is intruded by two types of mafic dykes with sharp contacts: (i) the blackish-coloured dyke closely associated with granitoids and dismembered in places, forming smaller angular enclaves and (ii) the greenish-coloured dyke forming relatively alteration-resistant, higher topographic levels in the northwestern part of the study area.
Almost all granitoid intrusive rocks in New Brunswick were sampled at that time, although difficulties involving access and exposure meant that some plutons, including most of the granites discussed herein, were only examined at a "reconnaissance" level.
The objective of this study is to geochemistry identify this pluton, determine the tectonic setting and granitoid series.
It should be noted that with decreasing the content of refractory clay and simultaneously increasing the quantity of granitoid screenings and dolomite, the rise of the diffraction peaks of anorthite is noted, the formation of which is explained by the reaction between CaO, arising during the decomposition of dolomite, with metakaolinite formed during firing of clay and quartz, the introduced with quartz sand.
These ages suggested that: 1) the massif had an Ordovician metasedimentary basal unit, dated with trilobites; 2) At the end of the Appalachian orogeny (that began 360 Ma and finished approximately 270 Ma ago), the granitoids were emplaced in the metasediments as a post orogenic event.
Based on drill core observations, Estonian Svecofennian granitoids are traditionally divided into syn- and late-orogenic granites (Niin 1997).
The upper scarp crest is also some 100 m higher near Zloty Stok than upon exposures of granitoids.
The composition of rocks was considered to be important in determining soil characteristics, so an attempt was made to distinguish more mafic, less siliceous granitoids (grandodiorites, tonalites) from quartz and alkali-rich variants ('granites' and adamellites).