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quartz

[kwawrts] /kwɔrts/
noun
1.
one of the commonest minerals, silicon dioxide, SiO 2 , having many varieties that differ in color, luster, etc., and occurring either in masses (as agate, bloodstone, chalcedony, jasper, etc.) or in crystals (as rock crystal, amethyst, citrine, etc.): the chief constituent of sand and sandstone, and an important constituent of many other rocks. It is piezoelectric and used to control the frequencies of radio transmitters.
Origin
1750-1760
1750-60; < German Quarz
Related forms
quartzose
[kwawrt-sohs] /ˈkwɔrt soʊs/ (Show IPA),
quartzous
[kwawrt-suh s] /ˈkwɔrt səs/ (Show IPA),
adjective
Can be confused
quarts, quartz.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for quartz
  • Two wizards go and remove the stone, which appears to be quartz, and then the novice is resuscitated.
  • Coesite is a variant of quartz that forms only under intense heat and pressure.
  • Step on a hunk of quartz in the dirt, and you'll think nothing of it.
  • It appears to be made of quartz and has cutouts near the widest end.
  • Some are crystal clear, others of smoky or colored quartz.
  • The researchers also discovered quartz flakes packed in some of the cave's crevices.
  • The oxygen stolen from the metals turns the silicon into silicon dioxide, or quartz.
  • The art itself-carved with chunks of quartz-is said to depict visions that came to the shamans in their trances.
  • Radios normally use a quartz crystal or some other oscillator to serve as a reference when adjusting the radio frequency.
  • Halogen bulbs are more efficient because their quartz cases allow the tungsten filaments to burn at a higher temperature.
British Dictionary definitions for quartz

quartz

/kwɔːts/
noun
1.
a colourless mineral often tinted by impurities, found in igneous, sedimentary, and metamorphic rocks. It is used in the manufacture of glass, abrasives, and cement, and also as a gemstone; the violet-purple variety is amethyst, the brown variety is cairngorm, the yellow variety is citrine, and the pink variety is rose quartz. Composition: silicon dioxide. Formula: SiO2. Crystal structure: hexagonal
2.
short for quartz glass
Word Origin
C18: from German Quarz, of Slavic origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for quartz
n.

"silicon dioxide," 1756, from German Quarz, Zwarc "rock crystal," from Middle High German twarc, probably from a West Slavic source, cf. 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."

Online Etymology Dictionary, © 2010 Douglas Harper
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quartz in Medicine

quartz (kwôrts)
n.
A very hard crystalline form of silicon dioxide used in chemical apparatus and in optical and electric instruments.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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quartz in Science
quartz
  (kwôrts)   
A hard, transparent trigonal mineral that, after feldspar, is the most common mineral on the surface of the Earth. It occurs as a component of igneous, metamorphic, and sedimentary rocks as well as in a variety of other forms such as rock crystal, flint, and agate. Some crystalline forms, such as amethyst, are considered gemstones. Chemical formula: SiO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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