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Longman Dictionary of Contemporary English
▪ Top right: Right handed and left handed quartz crystals.
▪ In addition to studies using the modal composition of a sediment, other provenance determinations can be made from individual quartz grains.
▪ This phenomenon has been utilized for dating sedimentary deposits of quartz grains.
▪ A summary of quartz grain features is given in Fig. 5.11 and photomicrographs in Fig. 5.12.
▪ Minerals giving very low intensity emission, such as quartz grains, required many minutes or even hours of exposure with fast films.
▪ Sandstone, for example, can hold very large volumes of groundwater because spaces are formed between the rock's rounded quartz grains.
▪ The shales are folded in an anticline and cleaved with development of cross cutting and saddle reef quartz veins.
▪ Gold is distributed throughout mineralised quartz veins, not just in sporadic shoots.
▪ Gold was also reported from minor quartz veins, with pyrite, chalcopyrite and galena, at Stronchullin in Strathclyde.
▪ a quartz gold watch
▪ Halogen bulbs give instant heat, while a quartz grill, the latest innovation, is quick and efficient.
▪ Mixed in with the global iridium-bearing clay layer are tiny particles of heavily shocked quartz.
▪ The Pga versus Umaa cross-plot shows quartz as the main mineral.
▪ Thermoluminescence is a property of crystalline materials, such as quartz and feldspars, which are found in pottery.
▪ They consist mostly of quartz and feldspars, with a little mica or amphibole.
▪ This phenomenon has been utilized for dating sedimentary deposits of quartz grains.
▪ This type of system works by pumping pond water through a quartz tube running parallel to an ultra violet germicidal lamp.
▪ Within their surfaces are tiny specks of quartz.
The Collaborative International Dictionary

Quartz \Quartz\, n. [G. quarz.] (Min.) A form of silica, or silicon dioxide ( SiO2), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque.

Note: The crystalline varieties include: amethyst, violet; citrine and false topaz, pale yellow; rock crystal, transparent and colorless or nearly so; rose quartz, rosecolored; smoky quartz, smoky brown. The chief crypto-crystalline varieties are: agate, a chalcedony in layers or clouded with different colors, including the onyx and sardonyx; carnelian and sard, red or flesh-colored chalcedony; chalcedony, nearly white, and waxy in luster; chrysoprase, an apple-green chalcedony; flint, hornstone, basanite, or touchstone, brown to black in color and compact in texture; heliotrope, green dotted with red; jasper, opaque, red yellow, or brown, colored by iron or ferruginous clay; prase, translucent and dull leek-green. Quartz is an essential constituent of granite, and abounds in rocks of all ages. It forms the rocks quartzite (quartz rock) and sandstone, and makes most of the sand of the seashore.

Douglas Harper's Etymology Dictionary

"silicon dioxide," 1756, from German Quarz, Zwarc "rock crystal," from Middle High German twarc, probably from a West Slavic source, compare Czech tvrdy, Polish twardy "quartz," noun uses of an adjective meaning "hard," from Old Church Slavonic tvrudu "hard," from Proto-Slavic *tvrd-, from PIE *(s)twer- "to grasp, hold; hard."


n. (context mineralogy English) The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, siliconoxygen2. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.

  1. n. colorless glass made of almost pure silica [syn: quartz glass, vitreous silica, lechatelierite, crystal]

  2. a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities

Quartz (disambiguation)

Quartz is a common mineral.

Quartz may also refer to:

Quartz (metal band)

Quartz are a British heavy metal band.

Quartz (scheduler)

Quartz is a job scheduling library that can be integrated into a wide variety of Java applications.

Quartz is generally used for enterprise class applications to support process workflow, system management (maintenance) actions and to provide timely services within the applications. Quartz also supports clustering.

Quartz is an open-source product from the Terracotta company.

There is also a port to .NET, called Quartz.NET.


Quartz is the second most abundant mineral in Earth's continental crust, after feldspar. Its crystal structure is a continuous framework of SiO siliconoxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO.

There are many different varieties of quartz, several of which are semi-precious gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and the Middle East.

Quartz (graphics layer)

In Apple computer's OS X operating system, Quartz is the Quartz 2D and Quartz Compositor part of the Core Graphics framework. Quartz includes both a 2D renderer in Core Graphics and the composition engine that sends instructions to the graphics card. Because of this vertical nature, Quartz is often synonymous with Core Graphics.

In a general sense, Quartz or Quartz technologies can refer to almost every part of the graphics model from the rendering layer down to the compositor including Core Image and Core Video. Other Apple graphics technologies that use the "Quartz" prefix include:

  • Quartz Extreme
  • QuartzGL (originally Quartz 2D Extreme)
  • QuartzCore
  • Quartz Display Services
  • Quartz Event Services
Quartz (band)

Quartz is a dance production duo of Ronnie Herel and Dave Rawlings, known for their collaboration with Clubland on "Let's Get Busy", which went to number one on the U.S. Billboard Hot Dance Club Play chart in 1990.

Their album, Perfect Timing, produced the early 1990s dance hit "Meltdown", and also teamed them with Dina Carroll on a number of tracks, most notably a cover of " It's Too Late". Their records were released on the Mercury label.

Quartz (publication)

Quartz ( is a digital global business news publication. It is owned by Atlantic Media Co., the publisher of The Atlantic, National Journal, and Government Executive. Its team of 175 staff members was pulled together from prominent brands in business journalism: Bloomberg, The Wall Street Journal, The Economist, and The New York Times." The four initial sponsors of Quartz were Boeing, Chevron, Cadillac, and Credit Suisse. Quartz's core market is global business people, with its focus on international markets. Its news articles cover global economy news, ranging from geo-political conflicts to policies and regulations.

Usage examples of "quartz".

The best-known locality is Fronolen near Tremadoc in North Wales, where crystals of the thin tabular habit occur with crystallized quartz, albite and anatase on the walls of crevices in diabase.

Miss Potton turned red and pale and pink, and blotchy combinations of all three, and finally settled on the mousseline de soie, for which Lydia then bought a pair of white satin slippers, kid gloves, and a thin gold chain with a pendant of rose quartz and earrings to match.

She dropped the poisonous monkshood rootstock and leaves into her burner, then took out her rose quartz.

It was shortly after this boom that the gravel surrounding the rich patch became very gravelly indeed, and it was determined that we should buy a small battery and begin to crush the quartz from which the gold was supposed to flow in a Pactolian stream.

There were garnet-red cherries, peridot grapes, apples like great rubies streaked with gold and amber, amethyst blueberries, strawberries glowing like pink charcoal, yellow pears of topaz, lucid gooseberries of translucent green quartz, quinces still on their twigs, melons, pomegranates, polished damsons, figs like blushing drops of jade.

Back of the gold-bearing quartz lies an enormous deposit of altered peridotite, which contains diamonds, in the search for which it evidently became necessary to extend one of the shafts to the opposite side of the mountain, possibly for purposes of ventilation.

Quartz and rock crystal, suffused with Plattnerite, glimmered about the framework, giving the whole a sense of unreality and skewness.

They worked by measuring a certain shear tension in a quartz bar doped with Plattnerite, a tension induced by the twisting effects of time travel.

The staple material, porphyritic trap, shows scatters of quartz and huge veins, mostly trending north-south: large trenches made, according to the guides, by the ancients, and small cairns or stone piles, modern work, were also pointed out to us.

To clear out the quartz would disrupt patterned energies, with the recoiling effects of unsanctioned release rewritten in her hapless flesh.

If the scorifier at the end of an operation is more than usually corroded, the borax should be replaced in subsequent assays on similar ores by powdered glass or quartz.

Dahome, so I should propose for Midian, now spoiled and wasted by the Wild Man, a broken handmill of basalt upon a pile of spalled Negro quartz.

Meanwhile the caravan continued its course down the broad smooth Wady Ruways, on whose left side was a large atelier, with broken walls and spalled quartz of the Negro variety.

Yet about the tank we lit upon large scatters of spalled quartz, which, according to the Baliyy, is brought from the neighbouring mountains.

This new thermoluminescence method can aid in determining the age of limestone and other rocks, such as dolomite, quartz, fluorite, and the feldspars, which are highly thermoluminescent.