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usually metamorphic 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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 composed of firmly cemented quartz grains. Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green, purple, or black by included minerals. It results from the metamorphism of pure quartz sandstonesandstone,
sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone varies according to the character of the cementing material; quartz sandstones
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. It is most easily distinguished from sandstone by the fact that it fractures across its constituent grains of sand, while sandstone fractures along the line of the cementing material between the grains of sand. Although most quartzites are metamorphic, some are sedimentary in origin, resulting from cementation of quartz sandstone by groundwater solutions containing pure quartz.


A variety of sandstone composed largely of granular quartz cemented by silica, forming a homogeneous mass of very high tensile and crushing strengths; used as a building stone and as an aggregate in concrete. See also: Stone



a regionally metamorphosed rock composed mainly of quartz grains that are macroscopically indistinguishable from each other and form a uniform dense mass with a splintery or conchoidal fracture.

In addition to quartz, quartzite often contains other minerals that are used to distinguish special varieties of quartzite; they include mica, garnet, and hornblende. The formation of quartzite is associated with the recrystallization of sandstone in the process of regional metamorphism. Quartzite also includes certain siliceous rocks that are products of the cementation of quartz grains by opal or that are products of the metasomatic replacement of limestone and other calcareous rock by silica. Ferruginous quartzites that, in addition to quartz, contain hematite or magnetite, are formed as a result of the recrystallization of ferruginous sandstones or siliceous schists. Quartzites are characterized by a high SiO2 content (95–99 percent) and by high refractoriness (up to 1710°-1770°C) and mechanical strength; their compressive strength is 100–455 meganewtons/m2 (1,000–4,550 kg/cm2).

Quartzites occur in various metamorphic rocks in the form of solid sheetlike bodies extending for great distances. Quartzites are particularly widely found in Proterozoic deposits. Many varieties of quartzite are valuable minerals. Ferruginous (magnetitic) quartzites are a most important iron ore (for example, the deposits of Krivoi Rog and the Kursk Magnetic Anomaly in the USSR, Lake Superior in the United States, and Labrador in Canada). Quartzites in which the SiO2 content reaches 98–99 percent are used for manufacturing dinas refractories, for obtaining metallic silicon and its alloys, and as a flux in metallurgy. (Deposits of pure quartzites are found in the Urals, in Karelia, and elsewhere.) Quartzites are also widely used in construction as a decorative stone. (For example, the Lenin Mausoleum and a number of the Moscow subway stations have been faced with the pink-red Shoksha quartzite.) Certain types of quartzite are used as an abrasive material.


Kurs mestorozhdenii nemetallicheskikh poleznykh iskopaemykh. Edited by P. M. Tatarinov. Moscow, 1969.



A granoblastic metamorphic rock consisting largely or entirely of quartz; most quartzites are formed by metamorphism of sandstone.


A variety of sandstone composed largely of granular quartz which is cemented by silica forming a homogeneous mass of very high tensile and crushing strengths; esp. used as a building stone, as gravel in road construction, and as an aggregate in concrete.
References in periodicals archive ?
The main rock types along the axis of tunnel are granite, quartz mica schist, and calcareous quartzite.
Granite Shield has stepped up to the plate to protect and maintain quartzite with a new product designed specifically to seal and protect quartzite," says Craig.
The team from the University of Pennsylvania had discovered the quartzite sarcophagus of Sobekhotep I, which weighed about 60 tonnes, a year ago, but was unable to identify who it belonged to until last week, the ministry said.
In March 2013, about 680 tonnes of quartzite mined at the deposit were delivered to Bratsk Ferroalloy Plant OAO.
Here we refer to experiments with 20 cm cubed quartzite, sandstone and tuff targets and a projectile size of 2.
Pizzara and Quartzite are porcelain tiles manufactured using latest digital printing technology to provide distinctively designed floor tiles having natural rustic finish.
RAK Ceramics' latest range of Pizzara, Quartzite, Yoho Marble and Royal Cremosa are a combination of different patterns of porcelain tiles to give a delightful natural look that blends harmoniously with any surroundings.
High-grade gold and silver grades over significant intercepts within the graphitic quartzite breccia clearly demonstrate the potential of the Camp Zone area.
Cut by hand and with a rotary blade, the works were extracted from blocks of quartzite, travertine, Black Portoro limestone, and Rose of Portugal marble, and were installed with enough distance between them that navigating to, from, and around these firm figurants, some on wooden blocks, impelled a contemplative stroll.
With its grand entrance, including quartzite water wall and brown leather wall panels, concierge facility and high spec apartment interiors, one-bedroom flats are priced at just under pounds 200,000.
The text covers basic information, including geological and commercial classifications, properties and characteristics, architectural uses, and the various quarrying and processing techniques, followed by full-color photograph samples of marble, travertine, onyx, granite, quartzite, and limestone available for use in construction and decoration.